My Corvette(s): 1974 454 Coupe / 1998 Trans Am both modded
Upgrading Heads... what size Valves???
This winter. long with a dual plane intake I already have, I am going to swap out heads on my big block to gain some additional HP and save about 180lbs.
What would be the difference in Intake valve sizes and why would I go with a 2.25" vs 2.19"??
__________________ 1974 Big Block Corvette Coupe: Paint code 74L; Med. Metalic Red. Original, #'s matching motor and trans. The motor has been worked to .030 over, with a long duration cam, roller rockers, Aluminium Performer 2.0 dual plane intake, and 4" cowl hood. Hooker chrome side mount headers flow into wide open chrome side tubes (That's 4 inches of exhaust per side!!) Bringing the whole package together are authentic Western Wheels circa 1976 running 255/60R15 Firehawk Indy 500 tires with RWL.
The 2.25 have just a slight edge in flow. The disadvantage is the valve pocket in the top of the piston might need a bit of enlarging.
If you go with 2 .19 the pistons were cut for them and if the seats ever get rough you can go to the slightly oversize valve to salvage the heads.
The new heads are now running 2.300
My Corvette(s): 1974 454 Coupe / 1998 Trans Am both modded
Quote:
Originally Posted by norvalwilhelm
The 2.25 have just a slight edge in flow. The disadvantage is the valve pocket in the top of the piston might need a bit of enlarging.
If you go with 2 .19 the pistons were cut for them and if the seats ever get rough you can go to the slightly oversize valve to salvage the heads.
The new heads are now running 2.300
My Corvette(s): 1974 454 Coupe / 1998 Trans Am both modded
There is a 170$ upcharge for Stainless Steel guides and seats over bronze... is there a benefit for my application (regular driving and an occasional trip to the strip), or should I save some bucks?
There is a 170$ upcharge for Stainless Steel guides and seats over bronze... is there a benefit for my application (regular driving and an occasional trip to the strip), or should I save some bucks?
I would go with the bronze guides. Never heard of stainless guides. As for the valve seats you will not have a problem with any of them. Even the old leaded seats survive fine with unleaded gas. Towing is what kills seats, not normal driving.
Upgrading Heads... what size Valves???
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