ok i have a question then, i have a mild 355

the heads are crummy heads with 76cc cambers, i am runnign a stock bottom end that came with the 85 truck 350 block.

if i put on some other heads like ARF's or World Products with like 68CC chambers what gain would i see.

right now im putting 224 rwhp and 307 rwtq.

thats with a stock bottom end, summit brand cam 224/224 at .5, edelbrock performer intake, edelbrock 600cfm electric choke, and mildly ported/polished heads.

thanks

 

Darth, not questioning your motives, just pointing out that you’ve got other compromises in your combination preventing it from being a fully optimized race engine and that being the case you might as well build a lower compression engine that you could race on pump gas (and possibly later put into street duty) and give up the 1 or 2 hp (well, maybe as much as 4 ).

The argument is somewhat moot since even if you did run a moderate size dome with those heads the compression would still be low enough that you could get away with pump gas assuming that you’re using a decent cam.

 

Lol, ok agreed. I had already kind of settled on going with around 12.5 to one, to appease my father, and someone pointed out it would mix better when I add nitrous later on.

 

For max NA power, wouldn't you want to leave it a 350, and run a 3" Stroke on it (265cuin crank if I remember correctly), run some 6" rods, a light knife edged crank, some light flat top pistons, and give it 13:1 compression and a solid lifter? Go with the largest valves you can cram into the head.

That way you could spin it sky high and get the HP you want? You'd have no low-end torque, but it would be a screamer. You can get away with more compression in short-stroke/long rod applications because of the increased dwell of the piston near TDC.

I also read that going with a smaller crank journal/oversized bearings will give you more HP, and that it will not negatively affect the longetivity of the crank.


I think you need to decide right now if it will be an all out NA motor, or a blown, or Nitrous motor. If you're going all out, you can't build it for NA now and then safely add N2O later. There would be too much cylinder pressure (right?)

 

Yea, but Im only interested in Drag racing, so wouldnt a stroker with crazy amounts of torque be better than a high RPM screamer for the 1/4 mile? And If I ran a 3 inch stroke on it I wouldnt be leaving it a 350. I believe thats a 302 with a 3 in stroke.

 

darth-
even better, big cubes and spin it high. your 3.750 stroke is good, keep the bore more reasonable. say .030.


flat top pistons, mill the heads to around 55cc probably.. thats just off the top of my head.. but you want at least 13:1.

Solid roller cam, period. Not much more money than a hyd, but way more power.

Sounds like your dad doesn't know a lot about this stuff, but just wants to spend some time with you.. time to teach him

(my dad is the same way.. 60's gear head.. I have to school him on REAL stuff he couldn't believe I was running 10.8s @ 130 and still got >20mpg

 

Yea, hes far better than me with a wrench, but I do more research into what I do. Hes a truckdriver/peterbilt mechanic. Hes been out of the musclecar game for a long time, but now hes getting back into it to try to find common ground with me I guess. Love in cars are one of the only things we see eye to eye on, so we both try to do it together.

Why not go ahead and bore more than .060? I know its less likely to be able to be repaired it it blows, but If I only drive it at the track, wouldnt the chances of blowing it be slim? And Ill force the solid lift cam on him, Ive got too much feedback on that to deny it.