[Scarebird]

Originally Posted by CAM400455

Why can't I find deals like that?!

http://seattle.craigslist.org/sno/pts/4584631084.html

Pay the shipping and I will send you these.

[PONTIAC LARRY]

Previous page OP posted he has already gotten a set of 6X-4 for ($100) and has since already had a shop rebuild them ($300)...

Thats not a bad deal on the 5C -4 heads though. If you were local I would buy them

[b-man]

Originally Posted by formula kid

I am talking about Factory D port heads. Yes HO and SD
Do flow better but you will pay $2,500 and up for a set.
70 64 are the only high compression heads Pontiac made.

In this case the OP was looking for the best 'bang for the buck', the highly sought after (by 1970 GTO restorers) #64 doesn't qualify, very expensive with prices in the $500 to $1000 range for good cores. For a fraction of the cost there are much better head choices out there with nearly the same chamber size.

The #64 is nothing special from a performance standpoint, there are quite a few D-port heads with nicer ports from the factory than this one.

[formula kid]

The point I was making for D port heads the # 64 are the top performance head out of the factory. If you want high compression this is the top . That is the point I am trying to make. You do not have to shave the heads for high compression and the valve size is as big as Pontiac made in a production head. So if you want heads that are a lower cost you can buy a set of #13 1970 heads 2.11 intake 1.77 exhaust give you about 9.5 comp on a 455 because they are 400 heads and are available.

[PONTIAC LARRY]

Originally Posted by formula kid

The point I was making for D port heads the # 64 are the top performance head out of the factory. If you want high compression this is the top . That is the point I am trying to make. You do not have to shave the heads for high compression and the valve size is as big as Pontiac made in a production head. So if you want heads that are a lower cost you can buy a set of #13 1970 heads 2.11 intake 1.77 exhaust give you about 9.5 comp on a 455 because they are 400 heads and are available.

Dude, #13 is 11:1 and up on a 455 man, give it up.

[FrankieT/A]

Originally Posted by PONTIAC LARRY

They also made the more common 70 #15 (Bonneville) it is the same compression ratio (10:1) as the #64 (GP and GTO) very little different between them. 360 hp versus 370 hp

Common Knowledge

ONE of the main differences between the 64 and the 15 is the 15 head has the smaller exhaust valve (1.66). Open that up to a 1.77 and then they nearly identical, with the 15's being much cheaper to start out with.

[PONTIAC LARRY]

Yep and since we are working with 40-50 year old heads we usually need to buy valves anyway...

[76WS4]

It's all bolted together with a '70 PR code TH400 trans behind it . Can't wait to feel the torque.

[1971WARBIRD]

another difference with the 15 head, is they use press in not screw in studs, and are a lot cheaper than 64 heads.
several guys updating to screw in and using on their 400 builds.

[pontiacreddz]

I have a 1976 Trans Am that I purchased from a guy its has a 455 with heads stamped 62 on the castings the compression I was told is 13:1 with a dome set of pistons I want to actually get the compression down to around 10:1 but I thought #62 heads were for a 400. 2:11 X 1:77's also wouldn't 13:1 be hard on a 455 with it's rod angle

[b-man]

Originally Posted by pontiacreddz

I have a 1976 Trans Am that I purchased from a guy its has a 455 with heads stamped 62 on the castings the compression I was told is 13:1 with a dome set of pistons I want to actually get the compression down to around 10:1 but I thought #62 heads were for a 400. 2:11 X 1:77's also wouldn't 13:1 be hard on a 455 with it's rod angle

Even without the domed pistons you'd be right around 11.25 to 11.5:1 with the #62 400/428 heads on a 455.

The 13:1 compression is only hard on your wallet because of the need for expensive straight race gas, the 455 rod angle is really a non-issue as far as high compression ratios are concerned.

You'll need a 20cc dished piston to get compression down close to 10:1 if you're intent on keeping the #62 heads.

[pontiacreddz]

Originally Posted by b-man

Even without the domed pistons you'd be right around 11.25 to 11.5:1 with the #62 400/428 heads on a 455.

The 13:1 compression is only hard on your wallet because of the need for expensive straight race gas, the 455 rod angle is really a non-issue as far as high compression ratios are concerned.

You'll need a 20cc dished piston to get compression down close to 10:1 if you're intent on keeping the #62 heads.

thanks I do want to keep the heads and just change out the pistons so I can run a mix on my gas having to run str8 cam2 is killing me especially with the 4.56 rear. want 10:1 with compression 4:10 rear and keep it in the 11:50 range and drivable on the street. and build a combo around that as far as cam and converter

[1971WARBIRD]

with a 455 that 4.56 gear is worthless on the street, even on the track racers need good slicks to control the torque.
street, I bet you would be a lot happier with 3.42-3.55 max. if you have some sticky tires and the right cam and heads to make power at a higher RPM, maybe 3.73-3.90 max, but I would consider those bracket racing type gears.
I ran 3.08s in my 73 455 Trans Am, it ran real well, but think it would have been about perfect with 3.23-3.42 gears. depending how yours is set up, rpm range it makes power, what gears it will run best with.
mine was; 455,+.030 flat top TRW pistons, zero deck block, small chamber 4X heads( approx. 9.0-1 compression, summit 2802 cam. ram air manifolds, performer intake, 1800 stall converter, 3.08 posi, 275x15x60 on ralleyII rims.

[vidguy]

Where do you see that price?

I see you can buy BARE Edelbrock heads for about that. Assembled heads are over $2000.00/pr as best I can tell.
http://www.jegs.com/p/Edelbrock/Edel...46694/10002/-1

Originally Posted by rexs73gto

You can buy brand new E-Heads for that amount. Buy a new set of heads that will give you the extra you need for the same price as the last guy posted. The price of the new E-heads that are 87 cc heads ready to bolt on & are round port heads for $ 1800.00 or you can buy the new D-port heads for $ 100.00 less & bolt them right on & go.

[rexs73gto]

A set of new E-heads at Lane Automotive which is the speed shop I deal with , you can get a new complete set for right at $ 1750.00 plus tax. The set I have right now cost me $ 1550.00 a few years back but I just was there about 3 weeks ago & they are at the $ 1750.00 price for them. Those are the 87 CC heads which on my 462 gave me right at 9.4 to 1 comp. It runs great & pushs my 73 4 spd. 373. rear car to 11.72 at 119 mph. The 462 fro mine has SRP forged pistons with eagle rods & a Crane RAIV blueprint cam with an Performer RPM intake with a Q-jet. All I have to burn is cheap 87 grade gas & runs that great without a ping or pop. I love them , but to I think your forgetting about the 69 RA III heads which are the # 48's . You can use pistons like I did on my last engine . I used some Jahns free floaters that had a 10cc dish with the 48's & all I ran was again 87 without any ping & it ran very good that way. The 48's are a very good flowing head to. As good as the # 64's for 70. The only diff. was the 48's were 65 cc heads & the 64's were 62 cc heads. Thats what gave it the bigger push on the 428 to get the comp up & be able to push the HP to 370 instead of the 366 for the 48's. Flow rate was the same. You have to remember that the extra HP came from the extra cubes fro the 428 & the little longer stroke. If you put the 64's back on a 400 it would be the 366 HP on the 400 just like the 13's were. It's like the old saying ,,, there no replacement for displacement. Bigger is better. Put the 64's on a 455 & you will get about 375 HP if all the parts are the same. Again displacement.