head

[Guest]

I'm having trouble locating the id numbers on my set of heads for a 455. How exactly do i identify my heads? and what heads are best for a 455 i plan on putting a 390 hp [1968 era] cam into?

[Guest]

There's a large letter(about 1" tall) cast on the corner of the head, ranges letter "A" through "J" which ids the year and application. Henry

[Guest]

what heads do i need to convert my 455 to a 390+ bhp motor and in an 84 c-body cutlass supreme what are my chances of being able to catwalk with my car without the use of nitrous?

[Guest]

I've located a "G" casting I.D. stamp on my heads what are the spec's on what type of car they came from and how do I find out the exact year make and model that these came from ? <img src="/ubbthreads/images/icons/blush.gif" alt="" />

[Guest]

[rocketraider]

They're 1971-72 455 heads, used on all carlines. Sometimes you'll find Ga which usually have bigger valves and are correct for 1971-72 W30.

[Guest]

thanx man mine have a G and along side to the lower right it has a figure that looks as if it could be the top triangle of an A or a triangular figure. Could it be a mis cast A or is it impossible and how could I verify whether or not they are W-30 heads? Please help - in desperate need of assistance;

Oldsmofo

[rocketraider]

The only surefire way I know of is to pull the head and measure the valve face. I've seen Ga heads on Ninety Eights and I doubt any of those were packing a W30! though I know of at least two Stage 1 Electras <img src="/ubbthreads/images/icons/confused.gif" alt="" /> so I suppose it was possible to get what you wanted.

That said- with the right pistons, G or Ga make a decent performance head. Keep that in mind- compression ratio on an Olds is changed with the piston, not the head. You need at least 10:1 compression to take advantage of a big cam like the 390 hp job you want.

[Guest]

what diameter should the valves be to be true W-30 heads for a 1971-2 455c.i.d.?