Engine Mounts/Header doesn't clear
Hello everyone. It's good to be aboard. I'm trying to put a Pontiac 400 from a '75 Grand Ville into my '70 Lemans. I first tried the mounts from the 350 I took out of the Lemans on the 400. It seemed to work fine until I put my headers on. The drivers side header cleared fine, but the passenger side header runs into the frame crossmember. I need the engine maybe 1/4" higher and it should clear.
I thought maybe if I used the mounts from the Grand Ville it would raise it up enough for the header to clear. It did, but it raised it too much and I would have to drill out the holes a little bit for it to work. I was looking for new mounts in an OPG catalog and found they are listed for '64 - '73. I'm assuming they are referring to the frame of the car and not the engine. They look the same as the mounts that were in the Lemans.
I have received a few suggestions about header clearance. One of them to put washers between the mount and the frame or the mount and the engine to give it a little more lift. I wonder if this will affect the stability of the engine. Another was to heat up my headers with a torch and bend them. That could work, but I wouldn't want to ruin the ceramic coating on there. Another was to start the car and when they are nice and heated up, use a board and push on them hard enough to bend them so they will clear.
Anybody have any suggestions for me? Any other mounts I could try? Any help would be greatly appreciated. Thanks in advance.