bayer-z28

iTrader: (14)

What are the typical recommended limits per c/r? I understand most things depend on the setup, heads, cam, intake and TB... But I'm tossing around a build idea here..

Idea: 408 with forged bottom end with about 10.5:1 c/r (stock-ish). But with dish pistons and a somewhat aggressive blower cam. I can run it NA and have some good power out of it until I get around to have the money for a blower/charger.

Either an LQ or LS 6.0 block with a 4" crank, using the same top end I am running now and get some GOOD deads when I can. Basically budget build the bottom end/block and drive it for a while and piece everything together over time.

So..... A somewhat higher c/r for NA, but can handle a bit of extra air when I'm ready for it. Am I better having a lower c/r and have it SCREAM on boost or have a mid-range c/r that will run good on NA? I COULD get my 243 heads shaved to up it for now, when I get the GOOD heads, aim for a 72cc CC...

Ideas? Questions? Problems?

blue00ZZleeper

iTrader: (5)

Whats your goals for the car? Power? Type of FI? Max Boost pressure?

bayer-z28

iTrader: (14)

^ I'm not planning crazy boost numbers. Prolly within D1SC capabilities.

As far as powerwise, I'm thinking maybe 650rwhp on max boost. Not sure exactly what it's capable of with 10.5 c/r. I know on low c/r a turbo'd 408 can make 900rw with a lot of extra air.

The car is just a cruiser for now. It gets driven once a week during the normal season, but I want it to be somewhat streetable. It's got a h/c LS1 now. Just seeing that these 6.0 blocks are pretty cheap and figure "why not." (yeah, I'm a little late to that game and getting tired of having old tech small bore.)

I may switch to turbo eventually... but for the time being, a blower is a little easier to deal with.

bayer-z28

iTrader: (14)

Anyone else? About what c/r can a built 10:1 or 10.5 engine handle? 5-8#?

Bob@BruteSpeed

iTrader: (16)

Keep in mind that stock LS2 10.9/1 engines run just fine at 8 psi of boost. Bob

bayer-z28

iTrader: (14)

^ That's what I was thinking too... Just wondering what's the physical limitation when adding more to a c/r that is mid to high. Detonation? If I figured on a 10:1 c/r I could get away with about 10#?

Bob@BruteSpeed

iTrader: (16)

With a centrifical supercharger you can run more compression than you can with many other types of forced induction. At 10:1 you could easily run 10 pounds of boost. Bob

bayer-z28

iTrader: (14)

^ Good deal.. I'll shoot for that then. 10-12. Figure 72cc chamber should give me 10:1 with dish pistons. Depending on valve reliefs.

Slowhawk

iTrader: (12)

You can make 650 on your current motor.

PRAY HRD

iTrader: (119)

As BADLY as i wanted to have my first motor built, it will sadly have to wait til next season apparently and i'm now doing the same thing you are pretty much. I have a 402 with 11.2:1 cr with the 62cc tfs 235 heads on it now and am looking hard at the AFR 245's to get my cr down to about 10:1 and just swap cam and p'rods and throw 10#'s through a turbo at it and see what it will do. I've spoken to quite a few people and all say 650rwhp is likely where i'll be at which i can live with without coming $5000 out of pocket and having to worry about selling a shortblock i have no room to store.

LMK how this turns out or watch for my post, depending on who gets boosted first! GL!