found something weird about my heads - Team Camaro Tech
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post #1 of 3 (permalink) Old Sep 1st, 08, 03:30 PM Thread Starter
Senior Tech
Shawn
 
Join Date: May 2005
Location: PA
Posts: 1,339
found something weird about my heads

the casting number near the valve springs say they are both 462 heads

now, on one of the heads, inside of one of the holes on the piston side (it may be a water jacket, im not sure) it has 462 cast on it, but the other head says 461

so what is the deal here?

are the 461 and 462 castings the same?

or maybe i have two of the same heads from different years/cars?

im pretty confused
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post #2 of 3 (permalink) Old Sep 1st, 08, 03:51 PM
 
Join Date: Apr 2000
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Re: found something weird about my heads

A -461 head is a double-quench head, AND the only one until you get to the 305HO, -601 type head!

The -462 has the quench cut back on the sparkplug side, (as does the -186, -291, -041 and some others), so is different and not a true double quench head even tho both can cc chamber-wise at 62 to 66 cc's depending on years and valve sizes.

As long as they cc chamber-wise the same, you should be fine for a street engine, imho.

pdq67



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post #3 of 3 (permalink) Old Sep 1st, 08, 06:04 PM Thread Starter
Senior Tech
Shawn
 
Join Date: May 2005
Location: PA
Posts: 1,339
Re: found something weird about my heads

Quote:
Originally Posted by pdq67 View Post
A -461 head is a double-quench head, AND the only one until you get to the 305HO, -601 type head!

The -462 has the quench cut back on the sparkplug side, (as does the -186, -291, -041 and some others), so is different and not a true double quench head even tho both can cc chamber-wise at 62 to 66 cc's depending on years and valve sizes.

As long as they cc chamber-wise the same, you should be fine for a street engine, imho.

pdq67
thanks for the info.. i just thought it was very awkward to see two heads that have the 462 casting number on them, and yet on the "inside" of the head one says 462 and the other says 461

from what i can tell both heads are the same (by looks anyways)

does this sound like the heads are actually different and come from two different vehicles?
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