Raising compression, Changing Lifters & Cam
#1
formerly ByuTrukFreak
Thread Starter
Join Date: Mar 2006
Location: Golden Meadow,LA
Posts: 296
Likes: 0
Received 0 Likes
on
0 Posts
Raising compression, Changing Lifters & Cam
The heads I run have stock chambers, I want to raise my compression ratio to 11:1 how much would I have to shave the heads, what size would the combustion chamber be. I need to change lifters, what GM lifter would work best on a 5.3. I'm going with a bigger split pattern cam. Comp suggested a XER 281 HR part#XE R54446-11, it's 232/234* dur. .595/.598 lift 112 lobe center angle 2400-7200 RPM range. The heads flow 290cfm @ .600 lift, the exh flow 216cfm @ .600 lift. I'm also gonna add a LSXrt Intake manifold and 102 mm Throttle body. What would be the best valve spring to run with this setup. I'm running Patriot Gold duals now. Thanks for all the thoughts, opinions, criticism and knowledge.
Trending Topics
#10
formerly ByuTrukFreak
Thread Starter
Join Date: Mar 2006
Location: Golden Meadow,LA
Posts: 296
Likes: 0
Received 0 Likes
on
0 Posts
That's with street tires I tried some drag radials, but they weren't big enuff, I need to get a better tune also, but I have the intake and needed to change the lifters so that's why the extra mods, also I'm sure the heads would breathe better with the split pattern cam. I also had some valvetrain instability in the past.