Help me with my build. Cylinder head choice on my 5.3
05-26-2011, 03:52 PM
#1
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Help me with my build. Cylinder head choice on my 5.3 Mods are in my sig.
I'm looking for more power out of my 5.3 LS4. I currently have 243s that have been milled for 10.25 cr. My camshaft was spec'd by Pat G with EPS lobes.
10.25 cr
Custm EPS cam 218/222 113 +2 adv. 267/272 advertised .595/.600
Ported LS6 intake
LS6 injectors
Stock 243's back cut valves, and slight head mill
1.75x3" headers into single 3" exhaust. 2.5" duals
76mm tb with 3.25" intake tubing
I shift 6500-6600 rpm
I have narrowed my head choice down to 3 heads
Stock 243 heads CNC ported by Advanced inductions. 227cc
Stock 243 heads CNC partial ported by advanced inductions 218cc
Trick flow specialties 5.3 heads. 205cc http://www.trickflow.com/partdetail....0&autoview=sku
I really want to run the TFS 205 head, but it has a 58cc vs the 62cc (milled) combustion chamber. With a 58cc chamber I'll be sitting at 10.8 ish Cr.
Would this be too much Cr with my cam? I can use a .060 gasket and bring the Cr down to 10.55.
My dynamic Cr is 8.2. With 10.8 I'll be 8.6.
Will the AI heads be too much for my little 5.3?
So.. what should I do for heads? I don't wanna run bigger valves and I want to keep my car snappy off of the line.
Please no, get a RWD car talk..
I'm looking for more power out of my 5.3 LS4. I currently have 243s that have been milled for 10.25 cr. My camshaft was spec'd by Pat G with EPS lobes.
10.25 cr
Custm EPS cam 218/222 113 +2 adv. 267/272 advertised .595/.600
Ported LS6 intake
LS6 injectors
Stock 243's back cut valves, and slight head mill
1.75x3" headers into single 3" exhaust. 2.5" duals
76mm tb with 3.25" intake tubing
I shift 6500-6600 rpm
I have narrowed my head choice down to 3 heads
Stock 243 heads CNC ported by Advanced inductions. 227cc
Stock 243 heads CNC partial ported by advanced inductions 218cc
Trick flow specialties 5.3 heads. 205cc http://www.trickflow.com/partdetail....0&autoview=sku
I really want to run the TFS 205 head, but it has a 58cc vs the 62cc (milled) combustion chamber. With a 58cc chamber I'll be sitting at 10.8 ish Cr.
Would this be too much Cr with my cam? I can use a .060 gasket and bring the Cr down to 10.55.
My dynamic Cr is 8.2. With 10.8 I'll be 8.6.
Will the AI heads be too much for my little 5.3?
So.. what should I do for heads? I don't wanna run bigger valves and I want to keep my car snappy off of the line.
Please no, get a RWD car talk..
06-08-2011, 07:38 AM
#2
As we spoke the other day I believe the 205cc head would be a great choice for you.
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