No, the 3.8L heads are cast iron. Sounds like whoever you talked to doesn't know their GM engines that well. Did you stress to them that it's a 3.8 Grand Prix, and not a 3.1? The 3.1's are aluminum. Besides, most of the anti-seize lubricants out there don't hold up to that kind of heat, anyway.

hey adam im glad you got here....cause i myself thought that the heads were cast iron but i didnt wanna say anything cause i was not quite sure myself.

now remember to put that hammer down!!!!!!

Changed the plugs and took off the engine brackets. It wasnt too hard. Only took about an hour and I only screwed up 2 knuckles. Both my thumbs. I could have done it quicer if it wasnt for that damn black holes that swallowed my tools twice. One trying to get the back engine bracket off and the other fell in behind the grill. Thanks for the advice everyone!!!

I don't understand, all the mods everyone makes to get more HP, and no one could see their heads and block are cast iron, come on, "RAY CHARLES" could see it. P"CHOP

Was kind of thinking the same thing...good one Porkchop!

If ever in doubt, just take a magnet to it. If it sticks, you've got iron.

has anyone installed those multi-prong platinum plugs from Bosch?...I've heard they offer some performance boost along with long life and no gapping...any other info you guys may have heard?

the 3.8 has been around for quite some time and yes it's all cast iron , it's a buik design originally a odd fire motor, redisigned in the 80's the same basic motor as the grnd national's that's why you can get such good perfomance out of a modded gp.

Ive read more than a few times that the multiprong plugs like splitfires etc are BAD for Mr Supercharger. Lots of KR.

the multi-prong plugs are a waste. the extra prongs allow for "hot spots" which causes knock which causes KR which slows you down which means you can't put the hammer down now that it's spring.

NGK's or AC's. Everything else is a gimmick.

The Iridiums a good choice. The smaller electrode seems to keep down the KR.

BY the way, If the heads are iron why doesn't anybody come up with aluminum heads to save weight
and Increase HP?

$$$$$$

sheesh aftermarket aluminum heads for a SBC are over a grand. With our aftermarket performance options I'd hate to see what they would charge for some aluminum heads.

By installing aluminum heads you'd be hurting the "bulletproof-ness" of the 3.8. Iron heads are considered better in my opinion; no head gasket failures. Besides, aluminum heads are out of sight when it comes to price.

It'd be nice if there were some aluminum heads but as has been previously noted, they would probably be super expensive. It would be good to have aluminum to help dissipate some of that heat a little better.