Sean Korb's 375 Windsor Stroker

This page: www.bacomatic.org/~dw/dehaven/dehaven.htm
Main page: http://www.bacomatic.org/~dw/index.htm
Last Updated: 6 Sep 2003

Author: Dave Williams; dlwilliams=aristotle=net

This 375 Windsor was originally built for David DeHaven's early Mustang. For various reasons it took a long time to finish this one. I had to make a bunch of tools, some parts had been discontinued, some parts had been updated and no longer fit, and some were just plain bad. Plus a lot of plain old weird stuff kept happening.

The engine finally got finished in February '01. Dave and I met in a cold, windy Denny's parking lot in Missouri and wrestled the completed engine, two Honda motorcycle engines, and assorted "stuff" from my truck to his.


In February 2003 David got Pantera lust, sold his Mustang project, and sold the 379 to Sean Korb, who is going to put it in his '68 Cougar.
Here's the core and assorted bits as they came from the core yard.

The "coffin" in the background is an old waterbed frame; part of it became my engine run stand later. The "garbage can" is the safety shield from my Coats spin balancer. Like most ill-designed "safety" equipment it was more hassle than it was worth. Coats thought they made it nonremoveable by welding the hinges to the main machine frame. That took only a few minutes with the air cutoff tool...


Left to right:

351 Windsor rod, 5.95" long, takes 2.311" bearing, .912" pin

360 Chrysler rod, 6.125" long, takes 2.130" bearing, .965" pin

350 Chevy rod, 5.7" long, takes 2.100" bearing, .927" pin


A better view of the relative rod lengths. The Chrysler rod has more meat on the big end and a beefier cap than the other two.

Narrowing the big ends on the milling machine. The Chrysler rods are considerably wider than the Ford crank journals.

I had done several engines with Chevy pistons and Chrysler rods before. The Federal-Mogul master catalog had a listing for a bronze pin bushing that fit almost perfectly - hone the pin end out a bit, drive the bushing in, then hone the bushing to fit.

Federal-Mogul stopped making the bushing, and I couldn't find anything else close. Since these rods didn't have to be set up for floating pins, I decided to use 1018 steel tubing instead. I made a lathe fixture to hold the thinwall tubing round while turning then OD, another to hold it for turning the ID, and drove the bushings into the rods with a hefty .005" interference fit. I thought nothing short of dynamite would remove them. I took them to the rod machine and honed the pin ends to .925" for .002 interference on Chevy pins.

I heated the first rod on the heating fixture, swung it over to the piston, already waiting in its locating fixture, and... the interference fit bushing fell out on the floor and rolled under the bench. WTF? The outside expanded as expected with the heat; for some reason, the bushing didn't. When I told some other shop guys about it they got big laughs, "yeah, that always happens." I took the MIG and tack welded the bushings in place, ran them back over the honing mandrel to make sure they were still round, and then started assembling the rods and pistons.


The Chrysler rods are good parts, but somewhere along the line I got the idea one of them was bent. I scouted every other shop within 75 miles and couldn't find one with a rod checker, so I designed and built my own, accurate to within .00025". Two fixtures were required. This first one makes sure the hole is perpendicular to the sides of the big end.

Since I already had some of the pistons hung I made it so I could check rods with the pistons on them.


Piston vise, flycutter, and piston. Federal-Mogul now ships Speed-Pro pistons in TRW boxes. There's nothing wrong with Speed-Pro pistons... except the TRW valve reliefs in 350 Chevy pistons will clear Ford valves and Speed-Pro pistons won't.

I found this out during the trial fit. The crank, cam, one rod, and a piston were installed, with one of my special undersize wristpins. The exhaust valves overlapped the reliefs by .050" or so.

I needed a piston holding fixture anyway, so I made one and flycut the exhaust valve reliefs for proper clearance.

During the build, the price of forged Chrysler pistons went from $180 to almost $400, and the $125 Chevy pistons went to $250. I bushed the Chrysler rods to take Chevy pistons and used them to save money.


We're on final assembly here. Well, it was supposed to be. With the main caps torqued down the crank turned with great difficulty. The crank was standard size on the mains; I had just ass-umed it was straight. It was bent almost .005" TIR on the #2 main. Everything had to come back apart, the crank had to be straightened and ground .010" undersize on the mains, and new bearings purchased.

I put the newly turned crank in the block on its new bearings, snugged the main caps down, and... it wouldn't turn! WTF? The Plastigage and micrometer relayed the awful truth. This block, the third block, the one that was Magnafluxed, torque plate honed, and detailed to the nines... this block had the wrong main caps! Not only did they not make a round bore, they didn't fit tightly in their cutouts. Damn!

I dug through my extensive cap collection and wound up having to pick a couple of those, plus sacrifice a good Windsor block to get five caps that were close. But they weren't quite close enough. I had to haul it off to Little Rock and pay $125 to have it align bored.

AB was driving my truck, so I pulled the passenger seat out of the Escort and rolled the block into the floor from the hand truck. It's actually easier to haul a block around in the Escort than it is to back the truck into the shop where the chain hoist is.


Okay, the crank is back in, bearing clearances are fine, everything is round or straight as it's supposed to be, and the block has been washed and dried for the dozenth time. All the bottom end is together and torqued. I'm getting ready to bolt the heads on. I already checked valve to piston clearance and wrote the figures down, but the Voices told me to check it again. More bad news - the exhaust valve doesn't even touch the clay, but I whacked an intake valve into the piston hard. WTF?

Back when I was trial fitting the engine pieces I had degreed the cam. It wound up 20 degrees advanced. I checked it half a dozen times, then checked a known-good cam just in case I was making some stupid mistake over and over. Nope, it's 20 degrees off. I finally called Iskenderian, who told me to just send it back. They replaced it without comment. I should have realized that being off that far would do dramatic things to the valve to piston clearances, but noooo... after degreeing the new cam it was apparent the pistons would need to be cut again.


You can't really see it well in this shot, but #3 piston is covered with felt tip markings showing where the new valve relief needs to be cut.

The lifter valley is painted with Nybco white epoxy paint. I can't find any local place that still sells it. The VHT white turns sort of yellowy when it gets oil on it, while the Nybco stuff always stayed bright white.

There's no real reason the lifter valley has to be painted; I just think it looks nice.


Here we are on the mill fixture again. I pulled the pistons one at a time, cut them, cleaned them, reassembled the ring packs and bearings, and reinstalled them before going to the next piston. It took a lot of cutting to clear the intake valves. These pistons also have offset piston pins, so the left and right banks had slightly different setups since the fixture locates the pistons by the pins.

Okay, valve/piston clearance is okay, everything is double-checked now, wrapping up the bottom end. This engine uses an MPG Head Service windage tray, which is also sold by Ford Motorsport. It's a pretty nice piece. The lump of clay on the oil pickup is for checking the pickup-to-pan clearance. I had to bend it slightly to clear the Milodon oil pan.

NOW it's time to put the heads on for the last time. The Motorsport oil pump driveshaft didn't have a retaining clip and could fall down into the oil pan when you pulled the distributor. I made an aluminum collar for it on the lathe and pressed it on. The distributor was in there to line it up so I could rotate the engine and make sure the crank didn't hit it.

Fortunately I hadn't bent any valves checking the clearances. All cylinders passed the vacuum tester check.

The mirror finish on the cylinder walls takes a while to generate with the hone. That's what Speed-Pro calls out in their instructions, though. Cross hatching the cylinders went away with chrome rings; moly rings want a smooth surface.


The engine used standard-length Motorsport hardened pushrods, believe it or not! It's rather rare for a Ford to have the pushrod length anywhere close when you're running roller rockers, since most rollers are really Chevy parts, and the cup height is different.

I'm setting the valve lash with a dial indicator. Some people like to play spin-the-pushrod and count turns on the lock nut, but the dial indicator is more accurate when you're using poly-locks, which tend to change their height when the lock nut takes up the slack in the threads.


Dave sent a brand new timing cover for the engine. I installed it and the rebuilt Damper Dudes damper. My TDC piston stop tool wouldn't work with the Edelbrock heads, so I had to make a new one. Good thing I did; see the step in the tape? That's how far the timing marks were off. Not too unusual for a small Ford since Ford has used a bunch of different locations for the marks and pointers. I used my Dremel to mark true TDC and 8 before.

The Far-East timing cover fit okay... but the four oil pan bolt holes on the bottom were metric! I had actually dug out four compatible-pitch metric bolts from my bench stock when I realized it would be a really nasty thing to do to someone; the holes were close enough to cross-thread a 1/4-20 oil pan bolt in to, either breaking off the bolt or stripping the hole. Just the ticket when you're laying on the ground trying to put the oil pan back on. I retapped the holes to 1/4-20. Now it doesn't have four weird pan bolts. Details, details...



============================================================================ MAXIMUM OVERDRIVE RACING ENGINES 379 Ford stroker completed 01/20/01 warranty: If it breaks, you get to keep all the pieces you can find. ***** 351 Ford stroked to 3.66", .030 overbore (379 CID) Isky 280 Mega cam, 232/232 @ .050, .517/.517 lift, 108 lobe center Edelbrock Performer RPM aluminum heads Compression: 776 cc swept volume (bore/stroke 4.060/3.66) 60 cc nominal chamber volume - 2 cc +.010" deck 7.3 cc .035 gasket 5 cc valve notches (estimated) -------- 7-.3 cc total clearance volume 776/70.3 = 11.0:1 CR ***** =========================================================================== * 3 oil filters, application: 1978 Nissan 510, 2.0L 4 cyl (L20B) Purolator Filter number L30119 Fram PH2850 Motorcraft FL-181 Wix 51452 These are full size, have no bypass spring, but do have the rubber flapper for anti-drainback for faster oil pressure buildup on cold start. This is technically a metric filter, but they will screw on just fine. You might want to keep everything clean so you can take one back if they have made a production change that keeps them from working. *Check* for the rubber flapper and no spring, just in case the filter maker has made a change. You can do without the flapper, but you don't want the spring. If you need a half height filter use the Purolator L22167 or equivalent. * 15 quarts of non-synthetic oil, 10w30 or 10w40 * torque wrench good to 100 ft-lb minimum * antiseize (high temp preferred) * gasket sealer (Ultra Copper or Ultra Blue) (make sure whatever you use is oil resistant - some silicone sealers are not! - read the label!) * new crankshaft pilot bearing * harmonic balancer bolt * 1 bottle of one of the following oil additives: Crane, Crower, Isky, Sig Erson, or other cam lube GM Engine Oil Supplement Chrysler High-Performance Supplement Ford Oil Conditioner C2AZ-19579-A * new spark plugs COMPONENTS --------------------------------------------------------------- crankshaft: 351W, 7M casting stroked to 3.66" mains 351W -.030" undersize main bearing clearance .0015" rods 2.123" small block Mopar (.001-.002" undersize) polished journals balanced (drill only) Seal Saver on rear seal surface pistons: TRW L2256F-60 forged 1.55 pin height (for 350 Chevy) flat top with four valve reliefs 4.060 diameter pistons are actually Speed Pro with TRW part numbers wristpin offsets .050" to quiet side pistons flycut for Edelbrock heads and Isky cam minimum .100" valve/piston clearance rings: standard small block Chevy. 4.060, Hastings, moly top side clearance .003 top and second ring gaps #1 .023 #5 .023 top .023 .026 2nd #2 .020 #6 .023 .022 .026 #3 .020 #7 .023 .021 .025 #4 .023 #8 .023 .024 .026 all oils ~.036 rods: small block Mopar, 6.123" long forgings checked for straightness and twist narrowed small ends (1.00") narrowed big ends pin ends bushed down to .925 (.002 press for .927 pins) steel bushings, .005" interference + tack weld rod side clearances .010" resized big ends (minimum size) chamfered sides of big ends Michigan 77 rod bearings, 340 Mopar bearings narrowed to .770-.775" wide (stock .830") rods use .001" and .002" shells for .002" rod oil clearance .001" shells on top, .002" shells on bottom some tangs filed to position bearings properly note: Mopar tang notches are randomly positioned block: 351W D4AE-6015-AA8 block casting, has bosses for four bolt mains bored .060 honed to .005 piston/wall clearance, spec for TRW forging honed to #600 finish (ultra smooth) 2 piece rear main seal (blue silicone around edges) new core plugs (blue silicone sealer) painted (Rust-Oleum black) new cam bearings (King) align honed mains heads: Edelbrock Performer 351W 5/16" guide plates 7/16" screw-in studs and polylocks all ports passed vacuum check heads take either taper or gasketed 14mm spark plugs, 5/8" reach 1/2" ARP head studs cam: Isky 280 Mega hydraulic advertised figures (checked at .007" after opening to .010" before closing) intake exhaust duration 280 280 open 32 BTDC 68 BBDC close 68 ABDC 32 ATDC lobe lift .323 .323 valve lift .517 .517 (at 1.6:1) lash n/a n/a lobe center 108 overlap 64 .050" figures 232 232 open 8 BTDC 44 BBDC close 44 ABDC 8 ATDC Isky cam lube used for assembly lube firing order: 351W firing order pushrods: Ford Motorsport standard 351W (length checked) (customer provided) rockers: Crane 1.6" gold aluminum roller rockers, 7/16" (customer provided) valves set to .030" preload with dial indicator during assembly timing set: Cloyes dual roller (customer provided) cam chain index +4 (degreed in 4 degrees advanced) 289-type one piece fuel pump eccentric oil slinger on snout of crank oiling: Melling high volume oil pump Milodon pickup Milodon oil pan Motorsport billet driveshaft - made aluminum collar to retain MPG windage tray, ~1/8" clearance to rotating assembly harmonic balancer: stock 351W, rebuilt by Damper Dudes (customer provided) checked TDC, cut long TDC mark and short 10 before mark flywheel: Hays billet steel, balanced to 28oz 14 1/2" x 1/2" lightening holes required for rebalance Ford Motorsport threadlocker-coated bolts intake: Edelbrock Performer RPM (customer provided) =========================================================================== assembly lubricants: rod bearings: 30wt ND rings: Unilube two stroke oil cylinder walls: Mobil 1 5w30 piston skirts: Mobil 1 5w30 wrist pins: Mobil 1 5w30 head bolts - threads: ARP moly grease main bolts - threads: 30wt ND head, main bolts - under head: ARP moly grease rod bolts: ARP moly grease cam bolt: Fel-Pro Grey Bolt Prep cam retainer plate bolts: Loctite 252 blue cam lobes: Crane cam lube cam journals: Isky cam lube cam distributor drive gear: Isky cam lube cam retainer plate/sprocket: moly grease crankshaft rear oil seal: Mobil 1 5w30 =========================================================================== Stewart-Warner Model 2000 Industrial Balancer balance: (reciprocating) 621 piston 143 pin 226 pin end of rod 59 rings (rotating) 497 rod big end 497 rod big end 49 rod bearing (.770-.775 wide) 49 rod bearing (.770-.775 wide) --- 2141 grams bob weight critical speed 750 RPM resonant speed 625 RPM max front imbalance .015 oz/in max rear imbalance .02 oz/in (balance is 1/10 of standard spec; close to the machine's resolution limit) balance was drill-only balanced for 28oz damper and flywheel =========================================================================== RUN-IN: ----------------------------------------------------------------- Make sure you don't have any loose wires or hoses in the way of the fan before firing the engine. It is a great temptation to just start it up with nonessentials hanging hither and yon. Pour in 5 quarts of your favorite brand of non-synthetic oil, 10-30 or 10-40 weight, one bottle of General Motors Engine Oil Supplement, and screw on an oil filter. It probably wouldn't hurt to fill the filter before putting it on. With the "+"coil wire disconnected and spark plugs out, crank the engine over until oil comes out the pushrods, or use an engine priming tool and a drill. Attach the coil wire and valve covers, put the plugs in, attach plug wires. Fill the radiator with straight water. Start the motor and run it up to 2000 RPM for 20 minutes to break in the cam. DO NOT IDLE. If you don't have a tach handy, run it up to a fast idle, then guess at twice as fast. Wedge a piece of cardboard or folded paper between the idle stop screw and throttle linkage. Use the timing light to set the timing to 8 degrees at idle; it's okay to let the engine to drop to idle for a few moments to do this. Smoke and noise will come from the motor as paint burns off, etc. Ignore anything that doesn't sound terminal. Water temp will probably go right on up there; it's okay as long as it doesn't go over 230 or boil over. If you have near neighbors remember this will make a fair amount of noise. Shut down. Change oil, filter, drain radiator and fill with 50/50 antifreeze or other coolant. Take care of any leaks or problems. Let engine cool. Break in by driving around for about a hundred miles. Try not to idle in traffic. Change oil and filter again. Check for leaks. The engine is ready to drive. At 3K miles you can change to synthetic oil if you wish. Oil Viscosity: Use the lowest viscosity oil required to maintain hot idle oil pressure of at least 25 psi. This will circulate the maximum amount of oil through the bearings. Very thick oil just goes right through the popoff valve built into the oil pump and you can be starving the bearings while the guage happily reads 60-80 PSI. TORQUE SPECIFICATIONS ----------------------------------------------------- --------torque---------------spec-----------thread---lube------------------ rod bolts stretch to .0065 (ARP spec .0062-.0067) 3/8-24 ARP moly lube main cap bolts torqued to 100 ft-lb (Ford spec 95-105) 1/2-13 oil note: 1) use moly grease under bolt head 2) step 1: 50 ft-lb step 2: 80 ft-lb (reverse pattern) step 3: 100 ft-lb (reverse pattern) head bolts torqued to 70 ft-lb (ARP spec 65-72) 1/2-20 ARP moly lube note: 1) with hardened washers, ARP moly lube both sides of washer 2) block is blind tapped, no sealer needed 3) step 1: 50 ft-lb step 2: 70 ft-lb (reverse pattern) step 2: 85 ft-lb (reverse pattern) damper (harmonic balancer) bolt (Ford spec 70-90) 5/8-18 oil note: use automatic transmission fluid as lubricant when pressing damper on intake manifold bolts (Ford spec 23-25) 5/16-18 sealer note: 1) see drawing for pattern exhaust manifold bolts (Ford spec 18-24) 5/16-18 antiseize note: 1) see drawing for pattern rocker studs (torque 40 ft-lb) 7/16-16 sealer note: use high temp antiseize if available timing chain sprocket bolt torqued to 40 ft-lb (Ford spec 40-45) 3/8-16 (Fel-Pro Grey Bolt Prep) cam retainer plate torqued to 10 ft-lb (Ford spec 9-12) 1/4-20 (Fel-Pro Grey Bolt Prep) oil pan bolts (Ford spec 7-9) 1/4-20 dry (Ford spec 9-11) 5/16-18 dry oil drain plug (Ford spec 15-25) 1/2-20 oil water pump bolts (torque 12-18) 5/16-18 antiseize timing cover bolts (torque 12-18) 5/16-18 antisieze 1/4 NPT threaded oilway plugs 1/4, 3/8 NPT Teflon tape oil pump pickup (Ford spec 9-11) 5/16-18 Loctite 242 oil pump cover plate (Ford spec 9-11) 1/4-20 Loctite 242 oil pump body (torque 30-35) 3/8-16 Loctite 242 spark plugs 18mm antiseize bottom pulley to damper (Ford spec 35-50) oil valve cover (Ford spec 3-5) 1/4-20 oil fuel pump to timing cover (Ford spec 19-27) 3/8-16 antiseize fan to water pump (Ford spec 12-18) 5/16-24 antiseize carburetor to intake (Ford spec 12-15) 5/16-18 antiseize SPECIAL PARTS ------------------------------------------------------------ specially made parts: 1018 steel rod bushings aluminum collar for oil pump drive rod modified parts: rods narrowed both ends rod bearings narrowed pistons flycut harmonic balancer remarked to true TDC neutral flywheel balanced to 28oz