84 Corvette Heads
09-19-2019, 07:03 PM
#22
Le Mans Master
Member Since: Sep 2001
Location: Unreconstructed, South Carolina
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113 Aka zz4 have 58cc Conventional chamber and Conventional intake bolt pattern ... Nothing about them are Vortec.
centerbolt only VCs, require rail aka self-align rockers unless guideplates installed,
angled plugs, D-port exhausts raised 0.100", 1.94" In - 1.5" Ex, No, there's no exhaust heat riser-Xover.
Me thinks 58cc chamber w/ typical dish piston and typical gasket makes just over 9.5:1 scr ... YMMV
centerbolt only VCs, require rail aka self-align rockers unless guideplates installed,
angled plugs, D-port exhausts raised 0.100", 1.94" In - 1.5" Ex, No, there's no exhaust heat riser-Xover.
Me thinks 58cc chamber w/ typical dish piston and typical gasket makes just over 9.5:1 scr ... YMMV
09-19-2019, 07:19 PM
#23
Drifting
Member Since: Jun 2018
Location: Brisbane Australia
Posts: 1,397
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C4 of Year Finalist (performance mods) 2019
113 Aka zz4 have 58cc Conventional chamber and Conventional intake bolt pattern ... Nothing about them are Vortec.
centerbolt only VCs, require rail aka self-align rockers unless guideplates installed,
angled plugs, D-port exhausts raised 0.100", 1.94" In - 1.5" Ex, No, there's no exhaust heat riser-Xover.
Me thinks 58cc chamber w/ typical dish piston and typical gasket makes just over 9.5:1 scr ... YMMV
centerbolt only VCs, require rail aka self-align rockers unless guideplates installed,
angled plugs, D-port exhausts raised 0.100", 1.94" In - 1.5" Ex, No, there's no exhaust heat riser-Xover.
Me thinks 58cc chamber w/ typical dish piston and typical gasket makes just over 9.5:1 scr ... YMMV
09-20-2019, 07:45 AM
#24
Le Mans Master
113 Aka zz4 have 58cc Conventional chamber and Conventional intake bolt pattern ... Nothing about them are Vortec.
centerbolt only VCs, require rail aka self-align rockers unless guideplates installed,
angled plugs, D-port exhausts raised 0.100", 1.94" In - 1.5" Ex, No, there's no exhaust heat riser-Xover.
Me thinks 58cc chamber w/ typical dish piston and typical gasket makes just over 9.5:1 scr ... YMMV
centerbolt only VCs, require rail aka self-align rockers unless guideplates installed,
angled plugs, D-port exhausts raised 0.100", 1.94" In - 1.5" Ex, No, there's no exhaust heat riser-Xover.
Me thinks 58cc chamber w/ typical dish piston and typical gasket makes just over 9.5:1 scr ... YMMV
04-23-2024, 07:31 PM
#25
??? 624
The 041 head is a good one, if you don't need to meet some tight smog requirements. It has a smaller combustion chamber than your original 624's, so will raise your compression ratio. Here's some info for you:
https://www.youtube.com/watch?v=uvmlKF5dr18
You may need to run mid grade, or maybe premium gas with the 041 heads. I'd suggest at least lapping the valves before you install the heads. Place the heads face down, then squirt some "spray lube" (WD-40 or the like) on the back of the valves. Look for leakage into the combustion chambers.
I hear so many conflicting things some people said 624 are prone to cracks what do you guys think of 906 ?
I don't know if the 041 heads have valve stem seals. You might want to upgrade to the later '84 style seals, and maybe even use the '84 exhaust valve rotators from your 624 heads.
I put a set of 993 heads on my '84, because I have to meet California smog laws. My car runs good and passes smog with flying colors!
https://www.youtube.com/watch?v=uvmlKF5dr18
You may need to run mid grade, or maybe premium gas with the 041 heads. I'd suggest at least lapping the valves before you install the heads. Place the heads face down, then squirt some "spray lube" (WD-40 or the like) on the back of the valves. Look for leakage into the combustion chambers.
I hear so many conflicting things some people said 624 are prone to cracks what do you guys think of 906 ?
I don't know if the 041 heads have valve stem seals. You might want to upgrade to the later '84 style seals, and maybe even use the '84 exhaust valve rotators from your 624 heads.
I put a set of 993 heads on my '84, because I have to meet California smog laws. My car runs good and passes smog with flying colors!
04-23-2024, 09:44 PM
#26
624 are lightweight version of 882 heads, they flow about 200cfm @.500 intake and 140cfm @.500 ex. 906 heads are vortec heads, flow 225/ 150. most modern aftermarket heads are better flowing. all depends on what you want to do.
04-24-2024, 05:10 PM
#28
Melting Slicks
You really should start your own thread on this subject since this thread is from 2019.