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Are all Pontiac 400 blocks the same If I put 1967 670 heads on a 1977 Pontiac 400 will it have high compression like 10.5 to 1?
Wiki User
∙ 14y ago
Essentially, yes. The Pontiac 400 is the same block all the way through the years. The biggest change is motor mount holes and locations. In fact, all 326-455 Pontiac engines are the same externally and will accept heads, cams, rods, intakes, etc from each other. All but the Ram Air V. But if you are lucky enough to own one of those, you already know all the information about them.
The biggest concerns with your proposed head swap would be valve angle and compression ratio. If you run 670 heads you will have at least 10.5 to 1. You'll need some very high octane fuel to run it. I am not 100% sure which 1967 heads had the old valve angle, but in 67 Pontiac was in transition of changing valve angles to the 68-79 version. Make sure to check piston to valve clearance.
Wiki User
∙ 14y ago
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