Thread: rollback engine build

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Originally Posted by Rivithead

suggestions
410 rear ,t19 4speed hydro clutch ,f350 no engine, 87 octane build
usage haul car, drag trailer with car loaded, freeway miles 80 mph.
gas mileage well LOL:

Yeah, LOL for sure on the gas mileage concept, with this package.

Originally Posted by Rivithead

have 385 dive aa out of Lincoln,10.300" block I think?

I'm thinkin' you are correct here, D1 was 1971 and I don't think they went to 10.322" until '72. Won't matter much anyway, you're probably gonna have to cut the decks to get to a zero piston deck so you can have a tight 0.040" squish to prevent detonation on pump gas. 9.0:1 with a 0.040" squish is what I'd be thinkin'.

Originally Posted by Rivithead

is aa first production thin web?

Not really a Ford guy, don't know. Maybe Denny knows. I doubt that it will be a problem anyway, I don't think you're gonna tear the webs out of the crankcase unless you go with a blower or N2O or both on nitromethane.

Originally Posted by Rivithead

list of parts I have for build.
4.39 bore

I too would keep the cylinder walls as thick as possible.

Originally Posted by Rivithead

bc crank journal

I wouldn't spend money on changing journal size, not for a low rpm tow motor. I'd simply use the proper length for the crank and piston that I would use.

Originally Posted by Rivithead

4.140 stroke

Nope, makes the static compression ratio too high for pump gas with the 74cc iron heads. Use the stock stroke crank and rods, unless you have to go stroker in order to find pistons with a large enough dish to bring the static compression ratio down to around 9.0:1 for running on pump gas without detonating the motor.

Originally Posted by Rivithead

6.70 rod

I would only use a different rod length over stock if I had to in order to match up with the piston compression height to make the stack work out.

Originally Posted by Rivithead

4032 srp -28 invert dome

I'd use the largest dishes I could find for use with the 74cc chambers. I would want to make the static compression ratio down around 9.0:1 so that I could use a fairly short cam, 200 to 205 degrees duration @0.050" lift, that would put the peak torque down low in the rpm range for pulling.

Originally Posted by Rivithead

dove c heads 74cc stock.

O.K, but it will be tough to find pistons that will work to bring the static compression ratio down to where you want it to use a short cam. This is not a lumpy cam build.

Originally Posted by Rivithead

head gasket?

Composition, about 0.040" compressed. Cut block decks to zero piston deck height to make 0.040" squish to prevent detonation on pump gas.

Originally Posted by Rivithead

oil pump?

Stock

Originally Posted by Rivithead

stealth intake

Yes, good choice

First gear ratio is 4.02, making a 16.482:1 final drive ratio with the 4.10 rear gears
Second gear ratio is 2.41, making a 9.88:1 ratio with the 4.10 rear gears
Third gear ratiio is 1.41, making a 5.78:1 ratio with the 4.10 rear gears
Fourth gear ratio is 1.00, making a 4.10 ratio with the 4.10 rear gears.
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