This is a discussion on 5.3 heads within the Internal Engine forums, part of the LSx Technical Help Section category; I am able to pick up some 5.3 heads for pretty cheap. These heads will help raise the CR right? ...
09-27-2009, 05:05 PM #1
I am able to pick up some 5.3 heads for pretty cheap. These heads will help raise the CR right? how do they flow compared to stock? I was looking for info but had a hard time doing so. Would i be better off getting my stock heads done? or is it not that big of a difference. Should i save up and get a cam instead? Thanks for any information.
09-27-2009, 06:22 PM #2
You will have to port them greatly & have larger valves installed. Then, you will have a great set of race heads. With the stock flat top pistons, you will be around 11.5:1 CR...
That's what I'm using, but I have lunati +12cc dome pistons & have 14:1 CR !!!
You can have the stock seats opened up to accept 2.02 / 1.6 valves !!!
09-27-2009, 07:03 PM #3
is it worth it to get that done to the 5.3 or is it better to have it done to the 5.7. or try finding ls6 heads? just curious for the cheapest way until i can afford some quality heads, or if its even worth it.
09-27-2009, 07:22 PM #4
09-27-2009, 11:10 PM #5
- Join Date
- Dec 2005
- Laurel, Maryland
2000 Grand Prix GTP
- 2000 Trans Am WS6 M6
I used Ported, Polished and Milled 5.3L Heads for my H/C/I swap. The previous owner of them had them CNC Ported, 2.02/1.60 Valves put in, and milled to 59cc Combustion Chamber. I am pushing 12:1 compression ratio with a .040 MLS Head Gasket.2000 Pontiac Trans Am WS6 M6: 427ci LS3, Built T56, Moser 9" w/ 4.11 Gearing, Full Suspension, and 6-point Cage.
2000 Pontiac Grand Prix GTP: Twincharged w/ a T67 Turbocharger
2007 Chevrolet 3500 Dually Duramax: 3" Downpipe, Dual 4" Exhaust, EFILive Tuning
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