Once again, if memory serves me, it's been about 15 or so years since I did all of this, but in a '66 Chevy pick up, you had the option of an in line 6 cylinder or a V-8 engine. The motor mount location on the front end cross member was determined by which set of holes the engine tower/motor mounts bolted into, more forward, or more rearward holes. Both sets of holes were in the front end cross member. I think even the same set of engine "towers" coming up from the cross member to the engine, which was connected by the rubber motor mounts, were the same for the 6 or 8. Again, the different hole location mounted the motor mount tower more to the front of the truck for the 6 and more to the rear for th V8(I think I got that in the correct order).
A quick check at any auto parts store could help explain and double check this. I feel sure the panel trucks, suburbans, etc were all the same, even if they were larger than 1/2 ton trucks. Chevy just didn't do a lot of different part making back then...one size fits all in many cases. PACO
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