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Old 01-15-2004, 01:16 PM
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Pontiac motor mounts

I have a 76 pontiac 400 that i am building and i found out that the block that i have is cracked on the #3 main by the dowel pin about 1/3 of the way around the main (on the thin part of the webbing, not quite to the oil galley).

Last night i bought a 67 pontiac 400 block. i took it down to the machine shop today and they pointed out that the motor mounts are different. the 76 block has three hole motor mounts and the 67 has only two and they arent spaced the same. Is there any way that i can get motor mounts that work on a 67 block and bolt into my 75 Trans Am? If not, how much danger is there in my origional block cracking all the way into the oil galley and losing oil pressure?

A speedy response would be appreciated because i may return the block to the owner today.

Thanks!

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Old 01-15-2004, 01:33 PM
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If it's cracked like you say, its a boat anchor, get your penny a pound at the scrapyard.
The 67 block while having different mounting locations should be able to be adapted over to fit your car.
How about the location of the mounts that bolt to that 67 block, how far off would the 67 mounts be in relation to the car you intend to put the engine into?
Would a simple engine and frame mount swap work in this situation? If you can get the mounts, that is.
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Old 01-15-2004, 01:45 PM
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the newer 76 blocks have the dual pattern (i am told that but it dont see it ) and i am using the newer style bolt pattern in my 75 trans am, which is 3 bolts in a triangle. the older 67 block has only a single 2 bolt pattern (side by side). the 67 bolt pattern is closer together than the 76. i was wondering is if i could use the upper and lower motor mounts out of a 67 firebird and maybe make it work? do you know of anyone who has put an older block in a newer car? if so, how?
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Old 01-15-2004, 06:39 PM
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These guys have what you need...

http://gallery.bcentral.com/Gallery/...58&Dept=198646

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Old 01-15-2004, 11:17 PM
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Thanks a lot! Much appreciated! I will be on the road in no time!
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