ENFORCER24

i picked up a core mid-70's chev 454
block was junk but the heads are good ,
my only head scratcher is that one head is a 049 casting , which is widely used in cars and trucks for performance , the other is a 048 casting , they look identical , came off the same motor , but i google the ful casting number and cant find anything about it.
i guess before i put them in the machine shop i'd like to know if the 048 is the same head

thanks in advance

kennyo

aren't they still oval port heads? If your going to spend the money rebuilding those yiu ought to go rectangle.

ENFORCER24

There large oval open chamber heads , and rebuilding shouldnt be to expensive , unless you know where i could get rectangular for a couple hundred bucks?
there a big upgrade from my peanut port heads that i have now , not to mention that i will have a much larger variety of intake combo's to choose from

45SS

Try google for a website called MorTec, it is in my favorites lots of Chevy casting numbers.

ENFORCER24

Been there done that , they are an awesome site for research
but no luck , they have the obvious 049 casting listed , but no 048
i'm gonna assume its the same head

ECeptor

Possible casting flaw making the 9 look like an 8?

kennyo

Probably cast in mexico and ran out of nines. I built a strong 496 with those heads.

Rookie

what is the full casting #'s of each head.

scroll down to the BB Chevy (page 11) it might be the first head they list in the BBC section.
http://racingfeed.com/downloads/chevy_flow_data.pdf

ENFORCER24

that was my first thought , that it was stamped incomplete , but the whole casting number 353048 in between the rockers , and the 048 on the intake runner in bold casting , either way , i'm using em , unless someone has a set of rectangular for cheap

KAAMA

Yeah to what he said (???).

Also, the old GM "049" casting is an excellent head size for a 454cid engine, but if you use the 049 castings, then you will need to have the seats replaced with hardened seats when using stainless steel valves of today.

The GM rectangle port heads are a bit too large for a 454 and they also have a tendency to crack between the seats....it's a roll of the dice as to when/if it happens.