What are the Standard Specs for Hp500 Cylinder Heads
#1
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What are the Standard Specs for Hp500 Cylinder Heads
Rectangular Port GM Part No.:
Combustion Chamber Volume (cc):
Intake Runner Volume (cc):
Exhaust Runner Volume (cc):
Intake Valve Diameter (in):
Exhaust Valve Diameter (in):
Combustion Chamber Volume (cc):
Intake Runner Volume (cc):
Exhaust Runner Volume (cc):
Intake Valve Diameter (in):
Exhaust Valve Diameter (in):
#2
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Join Date: Jul 2009
Location: west of chitown, il
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#3
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They're GM 088 heads - you can find tons of info regarding post sizes and flow numbers on the web.
118-120cc chambers.
2.18/1.88 valves.
Carbed HP500's used Manley Extreme Duty exhausts.
118-120cc chambers.
2.18/1.88 valves.
Carbed HP500's used Manley Extreme Duty exhausts.
#4
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Thread Starter
GM doesn't make that casting number anymore. What casting number is on the newer moters that replaces it.
#6
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#7
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I remember in a old service manual, the old 454/370HP,400hp had a standard bbc rect port head pretty much nothing fancy done to the head. But if you were a big spender, and got the 440HP, or 460HP cyclone engines, you got a multi angle valve job and some other stuff done to the heads, I cant remember.
#8
MarineKinetics
Platinum Member
Seahawk,
Rectangular Port GM Part No.: Casting # / Part#
6272990 / 6260482 or 14096188 Original LS-7/LS-7 Open Chamber Designed for the MK IV block
140970088 / 14096802 Service replacement head for the Gen V block
12562925 / 12562934 Service replacement head for Gen V / VI block with 7/16 accessory holes
12562926 / 12562934 Service replacement head for Gen V / VI block with 3/8 accessory holes
The last two are current working part numbers. All heads from GM have the 2.180”/2.190” intake valve
Verify block compatibility
Combustion Chamber Volume (cc):
118cc
Intake Runner Volume (cc):
325cc/318cc
Exhaust Runner Volume (cc):
125cc
Intake Valve Diameter (in):
2.180”/2.190” 3/8” Valve
Exhaust Valve Diameter (in):
1.880” 3/8” Valve
26º Intake valve
17º Exhaust valve
4 º Splay
All heads share the same basic port architecture and combustion chamber design. The is no significant performance differential between the heads.
Bob
Rectangular Port GM Part No.: Casting # / Part#
6272990 / 6260482 or 14096188 Original LS-7/LS-7 Open Chamber Designed for the MK IV block
140970088 / 14096802 Service replacement head for the Gen V block
12562925 / 12562934 Service replacement head for Gen V / VI block with 7/16 accessory holes
12562926 / 12562934 Service replacement head for Gen V / VI block with 3/8 accessory holes
The last two are current working part numbers. All heads from GM have the 2.180”/2.190” intake valve
Verify block compatibility
Combustion Chamber Volume (cc):
118cc
Intake Runner Volume (cc):
325cc/318cc
Exhaust Runner Volume (cc):
125cc
Intake Valve Diameter (in):
2.180”/2.190” 3/8” Valve
Exhaust Valve Diameter (in):
1.880” 3/8” Valve
26º Intake valve
17º Exhaust valve
4 º Splay
All heads share the same basic port architecture and combustion chamber design. The is no significant performance differential between the heads.
Bob
#9
Registered
Thread Starter
Seahawk,
Rectangular Port GM Part No.: Casting # / Part#
6272990 / 6260482 or 14096188 Original LS-7/LS-7 Open Chamber Designed for the MK IV block
140970088 / 14096802 Service replacement head for the Gen V block
12562925 / 12562934 Service replacement head for Gen V / VI block with 7/16 accessory holes
12562926 / 12562934 Service replacement head for Gen V / VI block with 3/8 accessory holes
The last two are current working part numbers. All heads from GM have the 2.180”/2.190” intake valve
Verify block compatibility
Combustion Chamber Volume (cc):
118cc
Intake Runner Volume (cc):
325cc/318cc
Exhaust Runner Volume (cc):
125cc
Intake Valve Diameter (in):
2.180”/2.190” 3/8” Valve
Exhaust Valve Diameter (in):
1.880” 3/8” Valve
26º Intake valve
17º Exhaust valve
4 º Splay
All heads share the same basic port architecture and combustion chamber design. The is no significant performance differential between the heads.
Bob
Rectangular Port GM Part No.: Casting # / Part#
6272990 / 6260482 or 14096188 Original LS-7/LS-7 Open Chamber Designed for the MK IV block
140970088 / 14096802 Service replacement head for the Gen V block
12562925 / 12562934 Service replacement head for Gen V / VI block with 7/16 accessory holes
12562926 / 12562934 Service replacement head for Gen V / VI block with 3/8 accessory holes
The last two are current working part numbers. All heads from GM have the 2.180”/2.190” intake valve
Verify block compatibility
Combustion Chamber Volume (cc):
118cc
Intake Runner Volume (cc):
325cc/318cc
Exhaust Runner Volume (cc):
125cc
Intake Valve Diameter (in):
2.180”/2.190” 3/8” Valve
Exhaust Valve Diameter (in):
1.880” 3/8” Valve
26º Intake valve
17º Exhaust valve
4 º Splay
All heads share the same basic port architecture and combustion chamber design. The is no significant performance differential between the heads.
Bob