Should I put 6L heads on my radixed 4.8?
Oct 13, 2005 | 08:51 AM
#11
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Joined: Sep 2003
Posts: 4,534
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From: Las Vegas, NV
Originally Posted by vanillagorilla
F8L put 317's on his 5.3 and was able to run 13-14psi. It was a turbo, but that just shows you the potential. I'm eventually going to this to mine, but I need a fuel system and better tranny first.
parish ran 18psi on his 4.8L with stock heads...
Oct 13, 2005 | 09:45 AM
#12
14 Second Truck Club
Joined: Aug 2003
Posts: 3,775
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From: Tucson, AZ
Originally Posted by 8ALTNG
I would say go with a set of LS1 heads. They will lower the compression alittle and I know for a fact that they make good power with a 4.8/radix combo.
Oct 13, 2005 | 10:37 AM
#13
Originally Posted by zippy
parish ran 18psi on his 4.8L with stock heads...
The 4.8's have been known to take more boost than it's bigger brothers. It's probably due to the shorter stroke and longer rod combo. JFYI.
Oct 13, 2005 | 05:51 PM
#14
I have ran 20+ psi by accident when my boost controller got stuck open. I dont know how much it actually made but the needle on the gauge went way past 20 and went all the way around to zero 
Oct 19, 2005 | 05:56 PM
#15
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From: Decatur, AL
Originally Posted by 8ALTNG
I have ran 20+ psi by accident when my boost controller got stuck open. I dont know how much it actually made but the needle on the gauge went way past 20 and went all the way around to zero
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