#3919840 big block Rec.port heads - Team Camaro Tech
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post #1 of 3 (permalink) Old Feb 5th, 07, 07:59 PM Thread Starter
 
Join Date: Oct 2005
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#3919840 big block Rec.port heads

A buddy trying to sell me a set of complete 840 heads, the casting no. is on bottom of the heads but they have been hot rodded a little, some one ground out casting #s and date code on inside and I think intake port is bigger exhaust looks stock , Im looking for a set to build a Yenko clone motor. One of the valve retainer caps cracked looks like alum. I thought those were steel. Dont know if they have been Milled. whats a set of heads like these with no date code and that have been messed with Run?
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post #2 of 3 (permalink) Old Feb 6th, 07, 06:30 PM
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Gary
 
Join Date: May 2001
Location: Chattanooga, TN, USA
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Re: #3919840 big block Rec.port heads

I wouldn't worry about the date, for a clone, as it is under the valve cover. My Yenko clone has August 68 dates on the heads. Pristine ones sell for $1200 or more. The ported ones would be worth somewhat less.
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post #3 of 3 (permalink) Old Feb 6th, 07, 08:40 PM
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george
 
Join Date: Sep 2006
Location: detroit
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Re: #3919840 big block Rec.port heads

Quote:
Originally Posted by rs/rs View Post
A buddy trying to sell me a set of complete 840 heads, the casting no. is on bottom of the heads but they have been hot rodded a little, some one ground out casting #s and date code on inside and I think intake port is bigger exhaust looks stock , Im looking for a set to build a Yenko clone motor. One of the valve retainer caps cracked looks like alum. I thought those were steel. Dont know if they have been Milled. whats a set of heads like these with no date code and that have been messed with Run?
Quick question?How do you know they are 840,s if the casting # is ground off?Aluminun retainers cracked? Remove one and use a magnet.As far as milling goes,the outer edge of the head that protrudes beyond the sealing surface usually measure .060 inch.As for dollars,I have a set of 840,s on a 427 that I would let go for $1500 with 2.250 and 1.88,s with pc seals and double springs with dampners shaved .010.The casting hump over the parting line on the front of the head is also an indicator that this is a HIPO head I do believe.
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