I am trying to put a pontiac 400 into a 63 chevy truck. SOmeone told me to use 71 - 79 firebird mounts and that they would work, but I am still having trouble making things fit. I was hoping someone would have some info or maybe knew someone who had done this and could give me a hand. I think I may just need the later model chevy truck brackets to attach the pontiac mounts to. ANY HELP??????

Welcome to the Board Raphyel.

Try posting this in the engine Forum. I'm sure you'll get some good responses there. Also try a search as there might be a discussion on it already.

I have done both Pontiac And Cadillacs into these trucks and I will tell you now. There are no GM mounts available to make the swap a bolt in.. You will have to fabricate the front mounts. I usually make the mounts from flat plate and round tubing with the same inside diameter as the engine mount crossbolt od.

I've done a few of those to, and had to make my own mounts, couldn't ever find any ready made, or GMs that would work.

Troy

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69 ss rs full custom camaro 98 ISCA grandchampion
69 ss rs bb camaro wifes driver
66 Elcamino 350/all dz parts,ac,windows,loaded,my driver
69 ss chevelle bb conv.fresh frame off
26 T sedan street rod

What about the GM mounts (like for a 66 with the 327) dont allow it to work for the Pontiac 400. This may be a stupid question but I have been curious and havent had the chance to examine this in person.

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1997 BMW M3 - 3.2litre Inline 6 cylinder

Not sure what your question is, but Pontiac mounts and Chevrolet mounts will not interchange

Troy

__________________
If you don't make mistakes. your not doing anything.

69 ss rs full custom camaro 98 ISCA grandchampion
69 ss rs bb camaro wifes driver
66 Elcamino 350/all dz parts,ac,windows,loaded,my driver
69 ss chevelle bb conv.fresh frame off
26 T sedan street rod

Pontiac mounts are high and wide, just under the heads and are completely different than anything in the Chevrolet line.

The pontiaac mounts for a 1971- 1979 trans am are almost identical to the mounts used for a 1980 chevy truck with a 292 engine. The metal brackets bolt to the engine and the rubber mounts bolt to the frame..

did you check with advanced adapters.com.they usually have nearly everything.

There are a couple of guys at http://67-72chevytrucks.com/vboard/ who have or have had Pontiac powered 67-72's & I think those have a similar frame & motor mount setup to a '63. There's also a '60-'66 forum there.

All you have to do is get a motor mount bracket set up out of a 1975-1979 full size or a and g body car- everything that bolts to the frame- rom engine block to frame- you take the motor and set it in with the assy all together and mark the holes on the mounts to the front crossmember- you might have to add more metal to provide a good plate surface- while your doing that, look at you clearances- make sure you have enough room for your headers/manifolds, distributor, and trans mount- also make sure that the motor won't articulate into the steering column.
Then check the motor mount's angle to the frame's cross member- grind the little bit of tabs on the ruber mount portion untill the motor sits level without binding on an angle to the frame on it's own weight (this makes it easier the next time you have to yank it out- also saves time if you're mocking up) measure twice, cut once- Drill your holes and bolt it up.