starting a new build

[Jasperstang308]

like it says i am going to be starting a new build for my 86 notch here soon. well as soon as my friend gives me the free 302 block. please critique and give suggestions
engine:

347 stroker 10.5:1 cr
AFR 205 heads
solid roller custom cam
1 3/4 exhaust
victor jr intake
700-750 dp
7-8k rpm

suspension

steeda lowers with upr spherical bushings
z motorsports uppers
MM subframe connectors
bogart wheels
D&D full k-member kit
steeda anti roll bar kit
lakewood 90/10s
lakewood 50/50's

thats just an idea so far what do u think?

 

[Jasperstang308]

also what gearing do u think would work for this set up? i was thinking in the 4.10 to 4.30 range

 

[97vertstang]

i dont think ull get that 347 to 7-8k :dunno:
to rev it that high ur probably better with a 306, really good valvetrain, and a WILD cam. oh and something like 4.56-4.88 gears.

 

[ryclef331]

i dont think ull get that 347 to 7-8k :dunno:
to rev it that high ur probably better with a 306, really good valvetrain, and a WILD cam. oh and something like 4.56-4.88 gears.

7k will be no problem with that motor...8k might be pushing it with a stock block. I think you need to be looking at like a 4.30 gear witha 28" tall tire. A 306 would be less stress on the block reving that high but like you said, you'd have to have a HAIRY cam in it and alot of gear b/c it'd be a DOG down low. A 347 would be better suited to those heads and tone down a more wild cam a little better.

 

[Jasperstang308]

honestly i would like to be shifting at somewhere around 7-75k 8 was just an example. do u think i will be able to throw a wet kit on there without fear of detonation? and still be on pump gas?

i am hoping for 420-450rwhp n/a do u think i will be at my goal?

 

[Jasperstang308]

bump

 

[ryclef331]

honestly i would like to be shifting at somewhere around 7-75k 8 was just an example. do u think i will be able to throw a wet kit on there without fear of detonation? and still be on pump gas?

i am hoping for 420-450rwhp n/a do u think i will be at my goal?

The higher you can turn a motor, the less susceptible to detonation it is. Shit is happening so fast at higher rpms, the piston will already be moving downward on the powerstroke even if the intake charge has preignited. High cylinder pressures and high load on the engine is what causes severe detonation....like flooring it up hill a 2,000rpms in 5th gear. You could probably get away with a small (75-100hp) shot but you could be pushing that stock block with that RPM and power level.

 

[Jasperstang308]

what about those girdles? do u have any experience with them? would they help it last longer or make it stronger?

 

[Anrev]

You might consider a DSS 331 stroker kit. Forged internals, and not as much stress on the rods and pistons at higher RPMs. The rod to piston angle is at almost its max in a 347. The angle on a 331 is much less. So it will rev higher safely. And it will handle the NOS better at those RPM ranges.

 

[Jasperstang308]

but wouldn't it need a small shot if nitrous to make up in the power i lost overall to from going to a 331 instead of a 347? thats a good point about the rod angle though