Heads for '74 455

My ISP just switched news providers and I can't retrieve some of the information that you guys gave to me a short while back. I may be going through my engine, (stock 455), this next summer, and am entertaining the
idea of putting an earlier set of heads on my engine. I found a set of '71 #66 D port 455 heads for sale. Would these work or what other years/numbers would work? Looking for a little better compression and bigger valves. Thanks for answering my question again. HD
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i don't know much about it, but if i'm not mistaken, the 6x heads are the best for the 455. i also think that any year 455 heads will fit all. but one thing you really need to watch out for is if they are pontiac heads or oldsmobile heads. they are different. do you have a pontiac or an olds 455? good luck and keep us posted.

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My TA is completely stock and original numbers matching. (about to hit 70k on the odometer) I am hoping to pull the engine and freshen it up a bit this next summer, and detail the engine compartment. I thought that while I was at it, I would bump up the performance just a tad. (not that it really needs it, but hey, why not?) I know the earlier 455 heads give a bit more compression and have the larger valves, so just wanted to double check which were the best ones to switch to. A couple of our resident Pontiac regulars gave me some numbers a couple of months back, but I can't retrieve the info now, so am asking for it again. Thanks for the help. HD
P.S. While I am asking, my power brake booster still has the factory inspection paint marks on it. They are a bit faded, but are these worth preserving, or should I clean them off when I do the detailing?

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You should be able to duplicate those marks pretty easily, depending on whether you mean a grease pencil mark or a sticker. Joe--ASE Certified Parts Specialist & 10th Ann.Club Tech Director '80 Carousel Red Turbo T/A, 27k orig. '79 "Y89" 400/4 speed 10th Ann. T/A, 57k orig '84 Olds 88 Royale Bgm 2 dr, 307 "Rocket" (lol), 143k and still going....
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