292 to 350 Swap

[deucecoupe]

I'm a little late to this thread. I'm doing a 250 to 327 swap right now into my '84 C10.

When I pulled off the old motor mounts on the front crossmember, there were two sets of holes - one set lower and one set slightly higher but neither forward or backward. The 250 lower sat in the lower set of holes.

I just mounted the new SBC motor mounts into the upper holes and everything is fine.

The pics from Bextreme04 were exactly what I used. The lower mounts are easy to find and purchase. I dug around on FB marketplace and craigslist to find a used set of the upper clamshells that worked perfectly. Just need paint.

This isn't a hard swap to do, but I've spent more time than I thought finding all the various brackets and pulleys.

Good luck

 

[nvrenuf]

You should read the replies, it's not the same with a 292.

 

[greyghost]

I have a 1984 C30 crew cab with a tired 292 I6 and I am looking to swap in a small block 350. Will I need to change the motor mount perches (brackets that connect from the frame to the cross-member). If I need to change the perches will I need ones from a C30 or will C10/C20 ones work and what about years, will 73/87 work or do I need ones from 81/87? Any help would be appreciated.

curious to know if swap has occurred yet, n wat outcome was? my thots I'm swapping out my 250 I6 for LS. The only way i know to tell is use a straight edge across bellhousing mt surface n rear side of engine mts measure distance , f numbers match good to go, if not a diff location set of holes must be used. be sure to used exact set for both sides as engine angle pitch is critical, also affects tranny angle pitch n tranny mt position stress. I believe there are 3 diff sets of mounting positions already in Xmember, b sure to clean out with thread tap. 3/8 coarse i think 18 tpi, same size as existing. clamshells mt to engine n rubber mt on Xmember. good luck on first try, no fun in a second try cept more time. check all measurements b4 hand will b best outcome..