horsepower_junkie

iTrader: (4)

Im not sure if this is where I need to be asking this question but it seemed as good as any to me!!! I am doing my first ls1 build in an 01 b4c. I have completely rebuilt the motor and I am waiting on a stall to finish the build. I figured this would be a great time to run a compression test to give me an idea of what kind of power this think might be making. All stock bottom end with new bearings. Had the heads milled a little and ported/polished. Comp 252/256 .595-.595 112+2 lsa. Just built to be a fun daily driver. Compression test shows 225 or so (my compression tester is a heap). Is this fairly normal for this motor or am I going to have to run some pretty hot fuel in it?

STEEPSS

iTrader: (30)

Lemme do some digging on my comp here. I used to have a compression calculator with all the comp lobes in a spreadsheet.

EDIT: I have it, but it doesn't work.(stupid computer reformat!)

Do a search for "ls1 compression calculator" you'll find something.

STEEPSS

iTrader: (30)

Double double post.

What cc pistons are you running? what is the combustion chamber on your heads? What head gasket?

horsepower_junkie

iTrader: (4)

Im not sure... The car is at my shop which is 50 miles away... Ive got all that info at the shop but I won't be back to get in until this weeken but I will try to remember and get it!

82cetuner

iTrader: (9)

I think I remember a guy doin a compression test on a stock LS1 and he was getting 220 in each cylinder, dont take it to the bank though cause I really dont remember if his was stock. If you had the STOCK LS1 heads milled then you are probably lookin at 10.5 or 10.7 I think if anymore is done in them than that you would have to flycut the pistions with that cam.

91 or 93 octane should do you just fine