[spawn_x]

Thanks! Main reason for kre or edelbrock heads are, the prices on 6x heads are pretty high up. Butler wants 2300 for two 6x heads, at that price why not go with an unmodofied aluminum casting, that was my thinking. Lighter, better design, screw in studs.

[JLMounce]

Originally Posted by spawn_x

Thanks! Main reason for kre or edelbrock heads are, the prices on 6x heads are pretty high up. Butler wants 2300 for two 6x heads, at that price why not go with an unmodofied aluminum casting, that was my thinking. Lighter, better design, screw in studs.

Agreed, at that price point, there's not much reason NOT to go with a KRE or Edelbrock D port.

Especially with these heads though, a smaller cam doesn't always do what you think it's going to. From your original post it sounds like you want to maximize power within a shorter operating range.

In these builds it's not necessarily that going to a smaller cam will create more torque sooner. In many cases, going to a somewhat larger profile cam will not only create the same amount of early rpm torque, but carry that torque further. 455 cubic inches is a lot; the engines soak up a lot of cam duration and are simply happier with more cam in them.

You didn't say if you were set on flat tappet or roller cams. My personal opinion is you need to shoot for @0.050" durations around 230-234 on the intake and need your gross valve lift with the KRE head between .525 and .550. You'll make over 500 ft lbs and it'll be basically available everywhere.

[Jay S]

Originally Posted by spawn_x

Thanks! Main reason for kre or edelbrock heads are, the prices on 6x heads are pretty high up. Butler wants 2300 for two 6x heads, at that price why not go with an unmodofied aluminum casting, that was my thinking. Lighter, better design, screw in studs.

That is the highest price I have ever heard of for a 6X head. Maybe look around before you give up on them.

I paid $200 for the 6X head on my car a few years ago (2020), and they came with a 400. I see them frequently on marketplace for $200 to $600. Sometime even freshly rebuild. Doesn’t sound like aluminum heads are offering much if you only want to rev the engine to 4500.

[spawn_x]

Originally Posted by Jay S

That is the highest price I have ever heard of for a 6X head. Maybe look around before you give up on them.

I paid $200 for the 6X head on my car a few years ago (2020), and they came with a 400. I see them frequently on marketplace for $200 to $600. Sometime even freshly rebuild. Doesn’t sound like aluminum heads are offering much if you only want to rev the engine to 4500.

I have not looked at FB marketplace, but ebay they are going for 1500/set. Theres usually nothing poncho related on craigslist, but FB may be worth a try. Also afraid to buy a used head that turns out to be cracked.

[Jay S]

Look up Phillips Muscle car parts. They ship and have a set 6X-4 for $600. 6X are not easy to crack, it is the toughest head Pontiac ever made. As far as I know anyway 4X is the heads that like to crack.

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