[remist17]

I am pulling a 4.3 V6 from a 1987 Chevy R10 Pick up. I am replacing it with a 383 stroker.

I know the V6 mount brackets are different than the V8, so i went to a local junkyard and pulled the two clam shells and two brackets(frame to cross member) off a 1986 truck. I did not think to see the size or model but it had a utilty box on the back so I figure at least a 3/4 ton.

Came home and the brackets will not line up with the cross member or frame holes. I thought the frames of the 80's trucks are the same.

What am I missing. How can I fix this?

I am assuming there is a difference either in the cross member of a 2 wheel drive VS a 4 wheel drive or this truck has a strange frame. Any help is apprecitated.

[remist17]

I looked at the frame and it seems that the lower part of the C is about 2" and the upper is aroun1 1/2" seems the C is not even. When the bolts are placed in the bottom of the bracket and tightened down it is about half inch off which is the amount of the frame difference. This is a factory frame and not hacked up. Anyone seen this before?

[remist17]

Wow no one is willing to help me out !!

Well I looked at the frame and mount brackets again... I had them in correctly and still about 1/2" from the holes. So I took some dimensions, 1 3/8 top flange of frame and 2 1/2" flange bottom of frame. Centerline of mount to centerline of mount 17 1/2".
Went to the junk yard and sat in front of some square bodies and looked at the mounts. Ifound a 86 C10 Top of frame is 1 1/4" bottom of frame is 2 1/4 and 16" center line.
I found a 87 burb 2 wheel drive... It had the same dimensions as mine. So to answer some not all squares are the same.

[callmej75]

You will need the frame mounts from an S10 with the 2.8 V6. Sorry, don't have any pics of that yet because my 2.8 is still in the truck. This is what I have followed from a bunch of V8 S10 swap forums. Then order the motor mount brackets from the net. Here is the whole kit, and it allows adjustability of your motor too from moving it forwards or back if needed.

4.3 V8 Swap Mount Kit

[va4cqd]

s10 mounts won't help for a half ton truck

[callmej75]

Sorry...thought that was a typo...R10...S10...

[va4cqd]

c10 name was changed to r10 for 87 only then changed again to c1500

[bigdog7373]

what engine was in the truck you took the mounts from. If it happened to be a 307 it has different mounts than a regular sbc.

[remist17]

Originally Posted by bigdog7373

what engine was in the truck you took the mounts from. If it happened to be a 307 it has different mounts than a regular sbc.

I am not sure. Motor was already pulled at the junk yard and I did not think to check the spec sheet. I would assume a big burb would have a 350 in it.

[va4cqd]

307s wern't offered in the 80s
305 and 350s would have used the same mounts from factory. there might be differences in the brackets between ½ and 3/4 ton

[remist17]

Originally Posted by va4cqd

307s wern't offered in the 80s
305 and 350s would have used the same mounts from factory. there might be differences in the brackets between ½ and 3/4 ton

I know neither truck was a 3/4 ton. The truck had different mounts than the burb. Just a FYI not all the 80's trucks 1/2 ton have the same mounts. Trust me I found out the hard way!