I have the Butler poly mounts in my 69 bird which has LB manifolds. The poly on the passenger side mount has a little heat damage from the manifold. One thing nice about the mounts is they are thick so the oil pan doesn't touch the crossmember which is an issue with off the shelf mounts.
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Will Rivera
'69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears
'64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears
'69 LeMans Vert, 350, #47 heads: Non-running project
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