rttmike

Car has 853's now. I want to have it tuned but I want to do it after it's done. As it sits now the car has cam, LT's, gutted cats, X pipe, CAI, polished TB. Not really happy with the 370 RWHP dyno numbers. Any advice on what heads I should be looking for? Budget is in mind as well.

rttmike

The car is a 99 FRC LS1 car

NukeC5

What kind of dyno did you run on? Ya, those heads are robbing allot of power if you only made that much with a cam that big! Ported 243's are usually the budget route and are sufficient for some good numbers.

rttmike

I need to be honest, I am unsure. This was done by the previous owner. I just got the car.

sami85L98

I have 243 heads lloyd elliot hand ported stage 2 heads with dual valve springs milled 2 though...62cc that should be great for ya, mine is SC and i would like to go 317 heads to reduce compression...heads have 2.04/1.6 valves on it. just refresh those cleaned up and ready to bolt on...i can $850 shipped. let me know.

370 is on low side for sure but i can tell you, i would go with better heads than Cam.

nullpointer

Another option would be pick up a set of used 243 heads and send them to Advanced Induction to be CNC ported. Mine had great results, or look for a set of used TFS heads.

rttmike

Sami, I wish I was ready to pull the trigger.

Correct me if I am wrong, 799's are the same as 243's?

rttmike

Is there anything to be gained by having my 853's worked a little bit?

NukeC5

Yes, 799 are the same casting. But they are similar to LS2 234 heads, not to LS6 243 heads with light weight valves. Either are a good choice.

Ive heard that ported 853's can be made to flow slightly better than an un-touched set of 243's, but then you are still limiting yourself, because at your level, people go for ported 243's or aftermarket to make use of the cam. Ported 243's would obviously flow way better than ported 853's and benefit you far more.

sean.b

i gotta agree with Nuke. If you do the work yourself or have a buddy at a machine shop, awesome, otherwise save the $$ and put it towards some 243s at a minimum. PRC's would be a little better and a little more. AFR 205's would be a lot better and a good bit more. TEA/TFS would be up there with AFR, maybe even better, and a lot more.

Bang for buck is with the 243/799 and a little work. Can keep it under $1k and pick up some good numbers.

printmanjackson

Advanced Induction has great program that doesn't cost as much as a full CNC job. It's a known fact that the exhaust ports really hold back on power. What they do a full exhaust CNC port, 5 angle valve job on their Newen valve machine, do some hand blending on both bowls, mill the heads to 62cc chambers and set up your valve springs. This way you keep the low in torque and responce by not cutting the intake ports and you get the increased HP from the valve work and exhaust. Here is the flow numbers that were sent to me on my 243 heads.

Jason 98 TA

Give us a call, we have tons of different options at all kinds of different price levels! We also offer milling based on your cam specs to give you the best possible gains for the $$$!!

We just ideally need to discuss the car & goals so we can best select a head to meet your goals!