Which heads would you choose?
12-27-2006, 04:09 PM
#1
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Which heads would you choose? I'm contemplating a heads/cam swap for the GTO (LS1). The cam specs are 215/232 .598/.579 on a 118LSA. I'm trying to decide between two cylinder head options. Both sets of heads have been fully reconditioned, valve jobs, guides and pressure checked, etc. and will come with flow sheets...
Option #1: (used) Factory 241's ported and polished by hand at a reputable race shop, milled to 62cc chambers, intake port measures 215cc, exhaust 78cc, and flow numbers are 285cfm @ .600 on intake, 215cfm on exhaust side. Cost w/ valvetrain set up the way I spec = $930
Option #2: (new) Factory 243's CNC'd by a popular vendor, milled to 62cc chambers, intake port measures 227cc, exhaust 80cc, and flow numbers are 300cfm @ .600 on intake, 215cfm on exhaust side. Cost = $1350 (again, to my valvetrain specs)
Granted, the 243's flow a tad better, but with a larger port(s). I know the 243's are supposed to have a better / more efficient combustion chamber... is it enough to justify the extra cost?
The 241's would maintain "factory" look, for whatever that counts... and I am kinda going with the whole "sleeper" approach with this car...
Car will be running aftermarket intake, LS6 intake manifold (stock), LT headers w/cats, factory exhaust; through a T-56 tranny.
If anybody can think of something I've missed here, please feel free to point it out. Looking for thoughts and opinions....
Option #1: (used) Factory 241's ported and polished by hand at a reputable race shop, milled to 62cc chambers, intake port measures 215cc, exhaust 78cc, and flow numbers are 285cfm @ .600 on intake, 215cfm on exhaust side. Cost w/ valvetrain set up the way I spec = $930
Option #2: (new) Factory 243's CNC'd by a popular vendor, milled to 62cc chambers, intake port measures 227cc, exhaust 80cc, and flow numbers are 300cfm @ .600 on intake, 215cfm on exhaust side. Cost = $1350 (again, to my valvetrain specs)
Granted, the 243's flow a tad better, but with a larger port(s). I know the 243's are supposed to have a better / more efficient combustion chamber... is it enough to justify the extra cost?
The 241's would maintain "factory" look, for whatever that counts... and I am kinda going with the whole "sleeper" approach with this car...
Car will be running aftermarket intake, LS6 intake manifold (stock), LT headers w/cats, factory exhaust; through a T-56 tranny.
If anybody can think of something I've missed here, please feel free to point it out. Looking for thoughts and opinions....
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12-28-2006, 08:15 AM
#11
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sleeper? then 241 if your current heads say 241 ..... and try negotiating the price .... if it has bigger valves and you`ll have to flycut the pistons and the polishing will show that the heads are not stock (dull not polished) then screw it prc 2.5 5.3 flycutting or prc 1 ls6 if you don`t need and won`t flycut (not sure when milled to the 62 chamber that you want) or patriot stock valved 243 or that livernois.
just an opinion.
just an opinion.
Last edited by Bader-X; 12-28-2006 at 08:21 AM.