I think that you can put larger that the 2.02/1.60s on a 383, right?

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission with 2.77:1 Rear End

Current Mods: Edelbrock TES Headers, Hooker Cat-Back System, Performance Resource Chip with 160* Thermostat, Accel Ignition Components, K&N Filters, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET: 14.3 @ 97mph

 

just a WAG but i'd say 2.1 intakes would be about it. talk to a machine shop, or look at aftermarket heads for a SBC.

 

You can only go upto 2.05"/1.65". Beyond that you are shrouding the valves. Theoretically you are supposed to go to a max. 53% intake and 41% exhaust based on the bore, and typically 50% intake and 40% exhaust.

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George P. Lara
1994 Z28 LT1 T56
1984 Z28 High Output
Member: SCCA, SCFB, SC3GFB

[This message has been edited by MRZ28HO (edited September 13, 2000).]

 

Valve size is limitted to the head, not the engine. If you want to dump about $15,000, GMPP makes a 14* sqlayed valved head (simular to the BB head) it has 2.3" intake vavles.

My AFR 210's have 2.08/1.6. Many aftermarket high performance SBC heads under $2500 have 2.18".

The runner size and flow is what you should be looking at.

 

210s? Wow, what size engine do you have?

------------------
1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission with 2.77:1 Rear End

Current Mods: Edelbrock TES Headers, Hooker Cat-Back System, Performance Resource Chip with 160* Thermostat, Accel Ignition Components, K&N Filters, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET: 14.3 @ 97mph

 

There going on a 406 Dan.