5.3 vs 243 Heads...Confusion
06-01-2007, 04:28 PM
#31
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A more budget friendly alternative might be to go with a set of milled 6.0L heads. They've worked good on my TR224 6.0L setup. Just food for thought
06-01-2007, 04:56 PM
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Originally Posted by slowprocess
A more budget friendly alternative might be to go with a set of milled 6.0L heads. They've worked good on my TR224 6.0L setup. Just food for thought
06-01-2007, 06:17 PM
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i have 799 heads too i dont think there like the ls6 heads....u guys think i can do this with my 799 heads i am going with a 220/220 cam i was thinking of adding ls6 valves and milling the heads what do you guys think?
06-01-2007, 10:03 PM
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Originally Posted by tdrumm
I do not know exactly how much milled = how many cc's are removed, but I can tell you that the porting that WCCH did to my 5.3 heads increased the chamber size to 65cc, same as a stock 243. Then milling them down .045 brought the chambers to 58.8cc. .045 was the max that Richard recommended milling them to avoid intake fitment problems, although a few here have milled them slightly more. I haven't heard of anyone ever shaving one of the stock intakes to help it fit with milled heads. Keep in mind that milling heads also reduces piston to valve clearance, although a .045 mill with even a .045 head gasket should be fine with a TR220.
Unported LS6 heads milled down to 58.8cc chambers with a 3.910 bore x .045 thick gasket on a stock 5.3 shortblock will net you ~10.0:1 compression.
Unported LS6 heads milled down to 58.8cc chambers with a 3.910 bore x .045 thick gasket on a stock 5.3 shortblock will net you ~10.0:1 compression.
Last edited by pbraxton; 06-01-2007 at 10:08 PM.
06-02-2007, 07:04 AM
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Originally Posted by pbraxton
how much milling is req'd to bring the 243 head chambers to 58.8cc.
06-02-2007, 12:41 PM
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Originally Posted by tdrumm
I'd put an educated guess that it would be around .045 like mine, but I bet that Richard at WCCH could confirm that. might want to try shooting him a pm.