LS4 Performance - New track times with TFS heads

Best run of the day was a 12.55@113.12mph with a 1.9ish 60ft. I also hit a 12.64 and a 12.67 with 1.9's I am having serious traction issues and ran a 13.0@113.98mph with a 2.3 60ft lol. My next mod will more tuning and sticky drag radials.

TFS heads have given me an average of 3 more mph. Last month I was trapping 109-110 and am now 112-113. The un-tuned heads have given me 25-30 more hp, with a lot more torque. With tuning I bet I will gain another 15whp. This would put me at 115mph.
Keep in mind that my previous 243 heads were pocked ported and slightly milled.

http://i48.photobucket.com/albums/f217/dapperdan1/2012-07-11_18-34-12_800.jpg 92* weather:mad:

Nice times!!

You going to be strapped on the rollers when you get tuned? You should be pretty close to 400 whp if not a little over!

Are you running the 5.3 or the LS1 Trick Flows? Part #.
Your response is appreciated.

same mph as my camaro, nice times.

Makes me excited to get my cam build underway.

I am running the 4.8/5.3 205cc heads

Tfs-30510001-c00

a god damn.

Damn.... That's fast . Congrats on your new times . Any vids ?

That thing is a "BEAST" for FWD V-8
:lol:

I am running the 4.8/5.3 205cc heads

Thanks for the Info. Would there be any problem using the 215cc Ls1 Heads?
Part# TFS-3060T001-C01. Thanks for your help and expertise in this area.
I've been throwing together a build for awhile now and just couldn't decide
among stock 243 build-up, TFS 205cc, or 215cc heads.

Good job, keep going!

Thanks for the Info. Would there be any problem using the 215cc Ls1 Heads?
Part# TFS-3060T001-C01. Thanks for your help and expertise in this area.
I've been throwing together a build for awhile now and just couldn't decide
among stock 243 build-up, TFS 205cc, or 215cc heads.

I would stick with the 205cc heads. They are designed for the small bore 4.8/5.3 LS engines. They will also bump your compression up to 10.6:1 with a stock .051" MLS head gasket.
The 2.04" valve in the 215cc head valve will kill performance due to valve shouding. The 2.00" is big enough. TFS moved the vlave angle to 13.5 degrees vs 15 (stock) to eleminate the shouding. This is why the head swap requires .100" longer pushrods.

Thank you.

i have been debating on what heads to choose, i may get these, are you using the springs they came with or no? my biggest problem is choosing what cam ,lifters and rockers to use

Man, David, nice setup!