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**WorkinLonghorn** · 09-26-2011, 10:14 AM

Not a big expert here but I had a 230 in my '63 and these are low-po engines (mine with very weak valve springs and leaking rings from decades of hard use) and if you haven't made substantial upgrades there will be no use in putting a 500 Holly on there or even the larger jetted one. I would stick with the original. But why couldn't you just bolt on the other ones and see for yourself? Maybe there would be some gain.

09-26-2011, 10:14 AM	#2
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,887	Re: 65 factory carb cfm's ? Not a big expert here but I had a 230 in my '63 and these are low-po engines (mine with very weak valve springs and leaking rings from decades of hard use) and if you haven't made substantial upgrades there will be no use in putting a 500 Holly on there or even the larger jetted one. I would stick with the original. But why couldn't you just bolt on the other ones and see for yourself? Maybe there would be some gain. __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme.