LOL...nothing at all, I'm just trying to see what my options are. And if i need to do anything to these heads before I put them on the 5.3 in my truck. From what I understand 243 heads on a 5.3 the CR is 9 to 1. I'm not going to be running FI or NOS. Will I be ok with running them stock or should I have them milled and if so how much?
Someone will surely chime in on the exacts. But I believe You can get 10 to 1 cr on a 5.3 and still be able to use them on a Ls1 later on. If nothing else when you got it taken apart put a set of 4.8 pistons in to raise compression that way...
06 Intimidator SS- Tuned, CAI -DD
03 Silverado- Last incarnation 13.6... RIP
Ls1, Pnp heads, Polluter camshaft, spray, 4k stall on the way
"Seize the day like you seize your noodle" - Shin Chan
I thought u said u got 241 heads
2000 Silverado ECSB- 5.3 CAI, Pacesetter LTs, ORY- Pipe, Magnaflow XL, E-fan, Ported T/B , Nelson Tuned, Built 4l60e, Circle D Stall, 3.42s G80, 2-4 Drop, Hertz Highs, Rockford 501s
2004 Buell XB12s
Originally Posted by LamboDoNoMo
I did buy a set of 241s, but the 243s where an extremely good deal so I sold the 241s.
Actually sold them today.
I ran 243s on my 5.3 and had them milled .040 which put the CR about 9.9-10.0 to one with stock mls gaskets. It made a big difference at higher rpm.
2008 Trailblazer SS 2wd red jewel 1ss
Forged 365,Tvs1900@11psi,IW 8 rib overdrive,duel pass heat ex,Prc heads,blower cam,Yank,Aeromotive,ect
Awesome...thanks Jake.
did u have any problems with PVC-
did ur pushrod change lenght?
did u intake line up correctly?
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