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Old 02-16-2013, 10:43 AM
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64 Pontiac 389 to 65' Pontiac 389

Hello: I'm looking for a basic answer to my question. I have a set of Edelbrock Aluminum Heads (#61599) for the D-Port Pontiac 389 engine. I also have Edelbrock's 2x4's intake manifold (54501) for the same engine. What I would like to know is that will these heads and intake manifold by chance fit on a 389 {1964 389 Block}. I noted the bolt pattern is certainly different. But when you match the cylinder head gasket to the 64' block and to the 65' cylinder head surface they do match up. Is there any other issue I may have to deal with such as water ports which when focusing on the problem seems to be the only problem. If not, then I'll go with a later block. Thanks very much if any of you Pontiac fans (or certainly others) can provide me this important background information.

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Old 02-16-2013, 12:15 PM
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The Edelbrock 61599 heads will fit any Pontiac engine block and the Edelbrock 54501 intake manifold will fit 1965-1979 heads. All is good.

Last edited by MouseFink; 02-16-2013 at 12:22 PM.
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Old 02-16-2013, 02:34 PM
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Quote:
Originally Posted by environspec View Post
Hello: I'm looking for a basic answer to my question. I have a set of Edelbrock Aluminum Heads (#61599) for the D-Port Pontiac 389 engine. I also have Edelbrock's 2x4's intake manifold (54501) for the same engine. What I would like to know is that will these heads and intake manifold by chance fit on a 389 {1964 389 Block}. I noted the bolt pattern is certainly different. But when you match the cylinder head gasket to the 64' block and to the 65' cylinder head surface they do match up. Is there any other issue I may have to deal with such as water ports which when focusing on the problem seems to be the only problem. If not, then I'll go with a later block. Thanks very much if any of you Pontiac fans (or certainly others) can provide me this important background information.
Don't use original-type pistons. The valve reliefs of the 389 pistons- if they're similar to the originals and not aftermarket or the dreaded "8 relief" pistons, will not align w/the valves of the Edelbrock heads. This can be a real problem if using a high lift cam.
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Old 02-17-2013, 08:45 AM
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Cobalt327 is correct. The valve angle was changed significantly. Any camshaft with more than about .520" gross lift WILL touch the pistons. Pontiac Dude (Ken Keefer, Ken's Speed and Machine, Brooksville, FL) offers a great deal on "custom" pistons for the Pontiac, that can be had with the valve reliefs in the correct position, and still use a 389 bore. We're building a solid lifter animal for a '64 GTO right now, including the "long rod" modification. Should make a nice 450 HP, 6,500 RPM motor... Nothing like a TriPower goat at "full song"!

All Pontiacs use the same bolt pattern, as cobalt also said. Deck height is also the same, 287-455 (not including the 265/301 "short deck").

Do NOT use Flepro (or other "stock replacement") head gaskets unless you block the oil feed passage coming from the cam bearings to oil the rockers through the head. Later engines oil the rockers through the pushrods. A catestrophic loss of oil pressure WILL occur if you don't. If your 389 is from a GTO, it already has this done, and the provision to mount the starter to the block. '64 "big car" 389s still had the starter attached to the bellhousing. Those blocks can be modified. Pre-64 389s have no casting flange for the purpose.

Jim
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Old 02-17-2013, 09:07 AM
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A 1964 Pontiac block is a good one to use if it is still in good condition. The 1964 389 block has provisions for a 1961-1964 bell housing mounted starter and a 1964-1979 block mounted starter. Avoid the bell housing mounted starter applications because starters, starter drives, flywheels and flex plates for those are extinct.

You are lucky to find a good 1964 Pontiac block because good 1955-1970 Pontiac blocks and cranks have also gone the way of the Do-Do bird or they are in the hands of "hoarders" and antique dealers. .
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