Engine swap...4.3 to 5.7

[dirtracer81_2]

Ok I took out the old 4.3 out of the 86 and now the 350 is ready to go in I thought....I had always heard they use the same motor mounts but after looking im wrong. My frame has multiple holes drilled factory I do beleive.

*My question is do I need to find the mounts from a truck with a 350 and use them?

*Also the power steering lines will they also work on the 350 pump?

Thanks

[zieg85]

Do a search, you will see the differences.  In short you will need the V-8 setup for your truck.  2wd is different that 4wd.  The power steering hoses are much longer with the V-6. 

[frito-bandito]

You need to be sure and get 350 mounts.

[jaredts]

Wouldn't the mounts from any sbc work?  It wouldn't have to be a 350 would it?  I just bring that up because 305's might be more common in the junk yards.

[murraygmc]

yes, i did the same thing to my truck . the mounts on the frame are different . you need the ( frame mounts off a truck that had a 350 ) if i remember correctly  you mounts are about 2 1/2 - 3 inches  from the crossmember the ones you need mount against the crossmember ..... watch your fingers them bolts can b knuckle busters and a real sob.... good luck and have fun!!!!

[Captkaos]

All V8 mounts are the same so yes you need V8 mounts, 305, 307 350, 400, doesn't matter as long as it comes out of a 73-87 truck.

[murraygmc]

right because i went from the 4 cyl to a 305

[Captkaos]

You did that in a fullsize murray?

[murraygmc]

O sorry , i meant to type i put a v8 in my 85 full size 4x4, went from the 4.3 to a 305 ..... sorry about the confusion

[frito-bandito]

Wouldn't the mounts from any sbc work?  It wouldn't have to be a 350 would it?  I just bring that up because 305's might be more common in the junk yards.

Yes as Capt. Said, any mounts from a V8 equipped 73-87 truck will work, sorry if I was misleading.