1967 400 with 670 heads. Trying for 400 Hp street - Page 2 - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-19-2012, 07:22 PM
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I hope it displaces 400ci. That's what I paid for and paperwork I got with the motor says it's a 400. It's just the codes that don't make to much sence. I can't see the side of the block or get to the pistons to measure them. The motor is currently sitting in the car complete with my old 7h1 heads from my original 350 on it. Just trying to get a good combination of parts. A cam good cam and valve springs. Trying not to break the bank. Just paid $500 for the 670's. Everything I've read about them said they are good heads. And they have a lot of potential. I don't want to have to buy another set of heads in the future.

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Old 07-19-2012, 07:38 PM
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Oh. And they are also A.I.R 670 heads. I was planning on having some mill work done. Maybe hardened seats and a valve grind.
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Old 07-19-2012, 08:29 PM
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Quote:
Originally Posted by 67pontiac400 View Post
I hope it displaces 400ci. That's what I paid for and paperwork I got with the motor says it's a 400. It's just the codes that don't make to much sence. Just paid $500 for the 670's. Everything I've read about them said they are good heads. And they have a lot of potential. I don't want to have to buy another set of heads in the future.
There is no way that 350 block could be bored to give you 400 cubic inches and with a .060" overbore it would take a crank with a 4.111" stroke, so I would say that you were scammed with that engine deal. The 670s are good heads, but to run pump gas, it would be a good idea to have hardened seats installed.

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Old 07-19-2012, 08:48 PM
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I'm going to be running E85. It's plentiful in NY. Any advice as to what valve springs to use? I' going to assume I do have a 400 so as to not get too stressed about paying $1000 for something I didn't order. And it came from pep boys too. What cam would be a good combination for my set up? Trying to get all I can out of it without spending too much.
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Old 07-19-2012, 08:49 PM
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By the way. NICE CAR!! 65??
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Old 07-19-2012, 09:06 PM
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Originally Posted by 67pontiac400 View Post
I' going to assume I do have a 400 so as to not get too stressed about paying $1000 for something I didn't order. And it came from pep boys too.
Look- you need to come to grips w/the FACT that you own a 350, not a 400.

It doesn't sound as though you've started it up yet, so if you bought it from PB, take it back and get what you paid for!!

If you go and cam it as if it were a 400 it could be a pig- a 'hot' cam in a 400 will be too much in a 350. The idle will be rough, it will make less vacuum so power brakes might not work right (or at all if the cam's radical enough), the bottom end power (what a Pontiac does best) will be lost and it will be an unsatisfactory engine all the way around.
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Old 07-19-2012, 09:59 PM
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I have started it and it ran great. Just needed a little carb tuning. Unfortunately the block was bought 12 years ago. I still have the receipt but I'm pretty sure returning it would be out of the question.
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Old 07-19-2012, 10:00 PM
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By the way. NICE CAR!! 65??
No, Bill's car is a '64, I've seen it run at Alaska Raceway, and it does run, the pictures make that obvious...
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Old 07-20-2012, 07:45 AM
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67,

These guys are speaking the truth. It is NOT a 400. Sorry. For future reference, ALWAYS "run the numbers" when you buy something, ESPECIALLY a remanufactured engine that's out of it's "prime" (those engines were being rebuilt en masse in the late '70s, early ''80s). Today, there is virtually NO "expertise" on the Pontiac in any "rebuilder". You must go to a specialty shop.

670 heads are indeed, 14 degree/closed chamber. They have a very good intake runner. They also have massive "potential". Gene Kinch's "Gallopin' Goat" goes 9.80s right at 3,100 lbs. using 670s on a 462 CID "stock" block (.030 over 455). No adders. A TON of port work in them though. The large valve heads are not recommended for 326 or 350 blocks due to smaller bore size.

Bill's car is ******! Like most other Pontiac racers, after he makes a pass, the "locals" are betting on how "big" the big block Chevy in it is... Nope. Not a Chevy... (:- Big-power Pontiacs are "back" now that the aftermarket has stepped up.

Jim
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