Head casting #'s
 

can someone identify the casting # 8947041 please? :bigears

are you sure the first # is not a 3??



..68......327.........."Right angle" casting identifier, 64cc chambers, good HP head,
used in trucks, no accessory holes
3947041....69-70...302/350......"Right angle" casting identifier, 64cc chamber, accessory holes, good HP head
3947041X...69-70...302/350......"Right angle" casting identifier, 64cc chamber, 165cc intake port, accessory holes, good HP head
3951598....70......400..........76cc chambers
3964286............350
3965742.

thanks , i rechecked and it is a 3 on the first number :thumbs:

Bad info - that head was never used on a 302. It was used on the '69 L-48 (350/300hp) Camaro SS; has the 1.94"/1.5" valves. :thumbs:

hmmmm....the info .came from mortec...i guess you never know....:toetap:

ok, thanks again for the knowledge

casting numbers
 

a good reference book I have is 1955-82 Corvette by the numbers by Alan L. Colvin

it shows Head#3947041 on page 153 apply to 1969 350 cu. 300 HP, unverified on the 350 HP, and 1970 350 cu 350 & 370 HP.

In the notes section it states the head is identical with #3782461 (a 327 head used in 1965 and 1966) except for a redisgned combustion chamber, the addition of a temperature sending unit boss and 3 accessory bolt holes added to the end of each head. This head was interchanged on some models with #3927186 and 3927187.

hope this helps

Mortec.com is a pretty good decoding source, but it has a number of minor errors and they don't work real hard to correct them. :thumbs:

i love that book it works good for numbers

yes thank-you, i'll look for that book