Red1996SS1519

iTrader: (7)

I'm debating between a 383 or a 355 for my setup and need some advice.

I have a 195cc AFR heads, LT4 intake and a vortech supercharger/intercooler, 42lbs injectors and everything ready to install, just need to decide between a 383 or a 355.

Here are the specs of the 355 :

Brand new stock GM crank
Scat forged I-beams with arp 2000 bolts
SRP -24cc dished(low compression) forged pistons .030 over
plasma-moly piston rings gapped for boost
all clevite H-bearings
arp 2 bolt main studs
It's setup for 12-15 PSI.

My goal is to reach 600 WHP. Do you think this 355 would get me there or I will need a 383. Give me some advice on a 383 build if you think this 355 wouldn't do it.

DeltaT

iTrader: (5)

The 355 will get you there, but the added torque of the 383 will make the car a LOT more fun, sinc the Vortech hit is a strong mid-range and killer top end.

My 383/Vortech T-trim combo got me to 632rwhp/576rwt at 11.7# of boost. It's a 9.6:1 motor. Plan on upgrading to 60lb. injectors though for those power levels, and a solid alky system for insurance on hot days, crappy gas or racing.

Jim

My Site: http://home.mindspring.com/~jim_fisk/id1.html

Red1996SS1519

iTrader: (7)

Waw, very nice job there. Good points.

Red1996SS1519

iTrader: (7)

Is torque the only difference between the two choices ?

DeltaT

iTrader: (5)

The longer stroke works well with boost too. Larger bore unshrouds the valves a bit more so they breathe better. Larger displacement allows a bigger cam to still be streetable. That's all I can think of. Oh, and nowadays the price is pretty much the same, so why not go large? Size does matter, no matter what they claim

Jim

engineermike

I agree with the others. Centrifugal cars are weak on low-end due to the characteristic of the boost curve. The added stroke helps the situation a lot. I too had a T-trim/383 combo.