90 f150 4x4 302 manuel 5spd. Im getting rid of the old 302 and buying a 408w short block from summit for 3,300 the one with the full forged rotator. Going to run a set of 185 AFRs with 58cc combustion chamber, believe the pistons are -5cc dish. RPM air gap dual plane intake with holley 750dp and a comp 35-426-8 cam with retrofitted hyd roller rockers. MSD distributor vacuum advance with 6al box and taylor wires open long tube headers. Since the truck was originally efi I'm going to use the stock pumps with a regulator with a return line because the truck did have a fuel return line from the factory. Correct me if this won't work? I will have to hook up a new throttle linkage but i believe all the gauges ran straight to the dash not computer so they should still work? Any obvious problems I have overlooked? Looking for 500+ hp at the crank.

 

That thing is gonna be a beast. /waves an early good bye to that 5 speed.

 

Think 500hp at the crank is a conservative number?

 

Not sure. I would keep it fuel injected though. Id love to have a engine like this mustang has in it.

 

I know I'll be crucified for saying this but in terms of hp per dollar I think I can get more with carbureted. Plus it's not my daily driver so I don't have to worry about starting it in 0 degree weather

 

The factory pumps will not supply enough fuel for much beyond 350HP at the crank. You need to rethink your fuel supply plan.

At the projected HP level your transmission and axles are the next fuses...

 

I think that 500 HP is optimistic.

 

I agree...probably in the 400-425 HP range. Even at that level the stock fuel pump is not healthy enough to support the fuel requirements.

An estimate for a 408 Stroker from Desktop Dyno




For amusement purposes only....

 

Anything over 1 hp / cubic inch is generally pretty difficult to do without boost or nitrous. So I'd say 350 hp is conservative, 400 isn't unrealistic and 450 is something to hope for.

 

If I was going to shoot for over 1hp per cubic inch do you have any tips to help me get there?

 

Something bigger than AFR185s and a custom cam. Budget for some real headers. It's going to take some money to make big numbers on all motor.

This site used to have a bunch of active dialog: SBFTECH.com Experienced Small Block Ford Tech - Index

But it has died down quite a bit since Cam-Master Jay got too big for his britches and was banned. Tons of good info there, especially the Myths forum that becomes visible once you join and have about 20 posts. It's an eye-opener that debunks common held beliefs of what is "supposed" to work.

 

Over 1 hp/ci is very easy to achieve; get an ls1.

jokes aside, 500 crank is not asking too much of a 408. Need 210+ afr's, over 10:1 compression, and cam to ~6500 rpm and good long tubes. Need to know your way around a carb of course.

 

35-426-8 from comp is the cam I would be running any thoughts on it?

 

I was always under the impression, that with the regulator on stock pumps running a carb, we'd be fine stretching it out. Maybe I need to look more into the whole volume vs pressure thing. Changing pumps in a truck is easy enough though.

 

When the engine demands exceed the volume capability of the fuel pump the engine starves for fuel. Bad situation.