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BBC HEADS # 3946074 Winters foundary

General engine tech -- Drag Racing to Circle Track

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6.50camaro
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BBC HEADS # 3946074 Winters foundary

Post by 6.50camaro » Thu May 21, 2020 12:36 pm

Hey y'll , stopped by the local machine shop today . The owner got a pair of these heads in for some work . He is not familiar with BBC performance heads . Do these have any great value as being rare or to a numbers matching guy . Casting number 3946074 dated 9. 8. 72 . Any info on these would be helpful . Dan

Ericnova
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Re: BBC HEADS # 3946074 Winters foundary

Post by Ericnova » Thu May 21, 2020 7:22 pm

1972 date puts them as over-the-counter sales as either a pair of heads or on a crate performance replacement engine....so not going to have a big value like a 1968-70 dated pair that could have come on a factory installed deal like an L89 option 396, 427, 454 or the ZL-1 Camaro 427 deal.

6.50camaro
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Re: BBC HEADS # 3946074 Winters foundary

Post by 6.50camaro » Thu May 21, 2020 9:19 pm

Thanks ericnova , I am assuming that is the date code (9. 8. 72) it is cast on the intake runner on the underside or deck side of the head . My buddy doesn't want to work on them if the were of great value . They look like a nice set of unmolested heads ,no port work, stripped threads , welding repairs only had a 3 angle vj and the intake guides were lined and reduced to 11/32 with some kind of threaded guide liner which have given up the ghost. . He needs to put new guides on the intakes and maybe just put liners in the exhaust . Dan

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Re: BBC HEADS # 3946074 Winters foundary

Post by 6.50camaro » Sat May 23, 2020 10:40 pm

Any tips on changing guide in these heads? Do any of them go thru the coolant passage like on the iron big block heads? Dan

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Re: BBC HEADS # 3946074 Winters foundary

Post by Sparksalot » Sun May 24, 2020 2:24 am

The guides are integral to the head casting. There is no separate part to replace. There are many ways to repair them. Liners (the mentioned threaded version is one type) are commonly used.

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