jtranger

I have a set of 461X heads that were just finished and ready to install. My '61 is the stock 315 Hp fuelie with stock exhaust manifolds,411's and the stock off road exhaust. I would like to know if I would gain any significant advantage or HP by putting on the 2.02's and shelving the stock
1.94X heads? Regards, Larry

1snake

You'll never be able to tell the difference between the two on the street.

Jim

robert miller

put it back as it was. You will be better off in the end...

DZAUTO

And, unless you bore the block at least .040 over, there is a very strong possibility that what you WILL notice is a trashed engine!
Why?
With a standard bore 283 (3.875in) it is quite likely that the larger 2.02 intake valve will make contact with the top of the cylinder bore. You MAY even be safe with the 2.02 valves with only a .030 bore.
If you are taking the engine to the machine shop and having it rebuilt, then where you WILL see some benefit is to have the intake ports port matched with the FI base plate and have the intake runners, bowls and combustion chambers cleaned up. I do not mean a complete port and polish, just simply clean up the rough casting surfaces.
The next thing that could be done to provide some improvement (and it WILL NOT be correct) is add 2 1/2in manifolds and AT LEAST a 2 1/2in pipe back to the mufflers, and of course preferably, all the way back to the end of the tail pipes.

Tom Parsons

BLOCKMAN

2.020 valves do work in those heads if the proper work is done such as bowl work and deshrouding the intake side of the chamber.

jtranger

Thanks for the input guys!

toddalin

Advantage, yes..., significant advantage..., not so much.

But if you do the related things (e.g., unshroud the intakes, pocket-port, 3-angle valve job, etc.), most definitely a significant advantage.

midyearvette

listen to tom parsons....especially with a std bore....

vettsplit 63

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