Guest Posted September 19, 2002 Share Posted September 19, 2002 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? Link to comment Share on other sites More sharing options...
Guest Posted September 21, 2002 Share Posted September 21, 2002 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 Link to comment Share on other sites More sharing options...
Guest Posted September 26, 2002 Share Posted September 26, 2002 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? Link to comment Share on other sites More sharing options...
Guest Posted September 29, 2002 Share Posted September 29, 2002 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="" /> Link to comment Share on other sites More sharing options...
Guest Posted September 29, 2002 Share Posted September 29, 2002 Link to comment Share on other sites More sharing options...
rocketraider Posted September 29, 2002 Share Posted September 29, 2002 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. Link to comment Share on other sites More sharing options...
Guest Posted October 2, 2002 Share Posted October 2, 2002 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 Link to comment Share on other sites More sharing options...
rocketraider Posted October 2, 2002 Share Posted October 2, 2002 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. Link to comment Share on other sites More sharing options...
Guest Posted October 3, 2002 Share Posted October 3, 2002 what diameter should the valves be to be true W-30 heads for a 1971-2 455c.i.d.? Link to comment Share on other sites More sharing options...
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