Schoust, Someone sells a solid motor mount for the first generation Firebirds, I think it is Indian Adventures? but, I am not sure. The first generation motor mounts have a built in mechanical stop similar to what Jim Hand posted. When you buy motot mounts take them out of the box and ensure you are buying the good ones, because the cheap ones do not have this feature. See it in my pic below.
Note: it is covered in rubber.
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1969 Firebird, Tx3-455/468 machined by CVMS
E-heads by Dave Wilcox/Comp Cams 300B-6 flat solid
850DP on E-85 by Eric Niefert/T2 1" plastic spacer
T-400/PTC 4000/390's/30x9 Hoosier radial slicks,#3400
1.38 60' 6.32 @ 108 MPH at Northeast Dragway NC 5/23/15 (9th pass on new engine)
https://m.youtube.com/watch?v=ePCu2v...ature=youtu.be
1.37 60' 6.26 @ 109 half track, 9.86 @ 136 1/4 mile, #3350 11/26/16 at Richmond Dragway (125th pass on new engine)
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