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sleekvino
08-23-2004, 07:05 PM
whats the differnce between the oval port heads,my buddy down the street has a bbc like me but his seems to have smaller openings his casting # is 346236,mine is 353049 any info would be great. :rollside:
Jet City
08-23-2004, 07:33 PM
Maybe this will help a bit...
http://www.nastyz28.com/bbcmenu.html
This lacks intake cc volume and such, but they look to be the same combustion chamber size.
sleekvino
08-23-2004, 08:29 PM
how do you know if you have large oval or small,i owned an olds so its new to me.
MudPumper
08-23-2004, 08:32 PM
how do you know if you have large oval or small,i owned an olds so its new to me.
The large oval ports are bigger than the small oval ports ;) sorry, couldn't resist that one.
MudPumper
08-23-2004, 08:43 PM
whats the differnce between the oval port heads,my buddy down the street has a bbc like me but his seems to have smaller openings his casting # is 346236,mine is 353049 any info would be great. :rollside:
his heads are oval port, open chamber 75-87 454
yours are oval port, open chamber 73-84 396-402-454
he has the peanut port heads and you have the larger ovals. Your heads have the largest "as cast" large oval port exhaust runner that were made with a maximum of 119cc. The large port heads breathe well up to 6500rpm as the small ports only breathe well up to 5000rpm. Your heads should have a 2.06" intake valve and a 1.72"exhaust valve. This is assuming the heads are in stock form. Hope this info helps :rollside: