SStressin

iTrader: (5)

building my max effort 383 right now and i found out my heads have 62cc chambers. so that would put my compression to 11.528.. is that to much to run on 93?

crazyelf

iTrader: (21)

You should be fine with a good tune. Im at about 11.2-11.3 on 91

groundczero

iTrader: (2)

Should not be a problem I am at 11.8 on 93.

mark21742

What are your can specs, mainly the intake valve closing point? The thing you have to look at is dcr and cranking psi.

In my 408 I'm running 12.5:1 static compression, but my can drops dcr down to pump gas friendly 8.22:1

From all I've found in most cases 8.5:1 dcr and 200psi is about max for 92-93 octane

Sales2@Texas-speed

iTrader: (5)

And altitude, and exhaust events, exhaust componentry, etc. DCR is a fun tool and useful, but it is by no means the end-all-be-all of pump gas friendliness calculations.

mark21742

Your definately right Matt, but would give a better idea than just the scr number

SStressin

iTrader: (5)

cam specs is a eps 240/256 .647/.647 111lsa

Ellesone

should be fine

SStressin

iTrader: (5)

alright thanks guys! every once in a while i will be throwing in 100 octane

Camaro Junky

That gave me a good laugh!

Thanks for the thread; I am in the process of making my LS1 a 383 as well. I will be doing a TSP 383 kit, -3cc pistons and either 64 cc or 63 cc LS6 heads from TSP.

I called Wiseco and I will be between 11.4 - 11.7 on compression, I just need to talk to Matt on what cam would be best.

KRAZY K 2000 TA

iTrader: (5)

i am 12.1:1 and running 93

Mighty Whitey

It's all in the tune

LS1 Racing

iTrader: (15)

So true. I'm at 10.9:1 on shitty 91 octane, ethanol-infested California gas, but Jim @ CalSpeed set me up with a dead-nuts tune, so I'm having no issues.