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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: dirtracer81_2 on November 24, 2009, 08:26:22 pm

Title: Engine swap...4.3 to 5.7
Post by: dirtracer81_2 on November 24, 2009, 08:26:22 pm

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

Title: Re: Engine swap...4.3 to 5.7
Post by: zieg85 on November 24, 2009, 09:49:11 pm

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. 

Title: Re: Engine swap...4.3 to 5.7
Post by: frito-bandito on February 04, 2010, 07:57:02 am

You need to be sure and get 350 mounts.

Title: Re: Engine swap...4.3 to 5.7
Post by: jaredts on February 04, 2010, 08:07:33 am

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.

Title: Re: Engine swap...4.3 to 5.7
Post by: murraygmc on February 04, 2010, 08:18:29 am

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!!!!

Title: Re: Engine swap...4.3 to 5.7
Post by: Captkaos on February 04, 2010, 09:31:00 am

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.

Title: Re: Engine swap...4.3 to 5.7
Post by: murraygmc on February 04, 2010, 09:54:12 am

right because i went from the 4 cyl to a 305

Title: Re: Engine swap...4.3 to 5.7
Post by: Captkaos on February 04, 2010, 10:08:57 am

You did that in a fullsize murray?

Title: Re: Engine swap...4.3 to 5.7
Post by: murraygmc on February 04, 2010, 10:30:19 am

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

Title: Re: Engine swap...4.3 to 5.7
Post by: frito-bandito on February 21, 2010, 07:22:35 pm

Quote from: jaredts on February 04, 2010, 08:07:33 am

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.