borderguy881

iTrader: (3)

Hey guys I was hoping to get some opnions on my build so far and hopefully get some questions answered. Ok so far, got a ls1 block honed to match my mahle 3.908 pistons, eagle rods w/ arp rod bolts, ls6 crank, so i believe this is now a 347 correct?

For heads, I was gonna go with the PRC 5.3L Stage 2.5 heads with the ms4 cam. I want this car to be a high revving, high hp car. I dont care about idle or low end abilities. Its going to be a weekend/track car. Will I have to have the heads machined to match the new bore? And if so should i have them milled to get a little higher compression? I dont want to touch race gas. I have 93 local here. Also the car may see some nitrous but no more than a 150 shot. I've heard the MS4 cam isnt the best for nitrous but 150 is kinda low for a ls1 right?

For intake I was looking at the FAST Ported 96/96 from vengence. Is this an overkill or with the ported 92/92 work?

deelong4002

iTrader: (8)

I believe you will have to flycut with that head/cam combination.

borderguy881

iTrader: (3)

the pistons have valve reflief already... also its going to be a m6 car with 3.42 gears and running about a 24.5" tire

LS1-450

iTrader: (33)

Talk to PRC to see if decking is even necessary. A 5.3L head is already increasing the CR & if it's a manufaturers stage ....anything, it's probably already decked. Don't have to bore match. Get PRC's recommendation on head gasket thickness & go from there. Nitrous?????????? There are guys doing it in LSX Miata's, but I have no idea why. So, I'll pass on that one. A Ported 92/92 is more than enough. Doesn't really matter which FAST you choose, 'cuz the nitrous is just gonna blow it apart anyway. Good-luck & post your build in the hybrids section. I would like to follow it; sounds interesting.

borderguy881

iTrader: (3)

Even a 150 direct-port wet shot will blow it up? If that is true than I might just stay NA.

LS1-450

iTrader: (33)

A nitrous backfire will blow out a nylon intake. Trust me, I've been driving an LSX Miata for over 6 years now. They're not dragsters, they are excellent street & road course cars. Your set up will make plenty of low end torque & HP W/those heads/cam. A ported LS6 intake w/an 85mm throttle body is a good, less expensive, alternative if the FAST isn't a must. I'm the worst guy to ask about nitrous, cuz' I'd never use it, but you could have a great, lifetime, well powered car, if you stay away from it (as long as it's not involved in an accidient). You'll be in the 400/400+ range w/ that set-up. Keep the car low weight & she'll have an as good or better power to weight ratio than most supercars.

borderguy881

iTrader: (3)

Hey guys its been a long time now since ive posted but ill let you know whats going on.....

LS1 Block
Mahle Pistons 3.908
Eagle Rods w/ ARP 2000 bolts
LS6 Crank

PRC 5.3L Heads Stage 2.5
MS4 Cam
Ported FAST 102 w/ 102tb

Motor gets assembled this weekend. Already have brand new built trans thanks to rkt56.com . I have been making alot of progress and hope to have it ready for september. Car just sits as is with no motor. I need to drop subframe and bolt up new one with frame rails. I have some pics just let me know if you want some specifics.

borderguy881

iTrader: (3)

Tainted

iTrader: (9)

how bout ls6 pcv system or breather set up? LS2 chain? have you though of going ls3 chain/setup

borderguy881

iTrader: (3)

using ls6 pcv system and rollmaster double timing chain

ShortChevy

iTrader: (21)

Man I'd love to replace my 90/90 setup with a 102. That is great looking and appears to be a way better engineered intake. You should be right in the 450whp area with that setup.