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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: murraygmc on November 12, 2008, 01:32:21 am

Title: dumb question
Post by: murraygmc on November 12, 2008, 01:32:21 am

i have a 85 gmc sierra 4x4 and it has a 6 cyl the rings are shot wanting to put a 350 in it. its got a 4 speed manual trans my question is from what range of years will a 350 sit and bolt right in i know ill have to get a new radeater an fan shroud thanks

Title: Re: dumb question
Post by: dumbucket1 on November 12, 2008, 01:54:01 am

any year 350 will work. You need to change the engine mounts on the frame though.

Title: Re: dumb question
Post by: Blazin on November 12, 2008, 09:45:21 pm

85 and newer will bolt right in because they are a one piece rear main seal engine. A two piece rear main seal motor will work but you will have to get a fly wheel that fits a two piece rear seal crank. If it were me I would swap in a bigger diameter clutch, which might require a bigger flywheel anyway.

Title: Re: dumb question
Post by: eventhorizon66 on November 13, 2008, 10:14:23 am

I thought '86-up were one-piece rear main seal.

Title: Re: dumb question
Post by: Blazin on November 13, 2008, 10:42:08 pm

I have heard that before too, but I had an 85 built 5-85 and it was a one piece rear main seal.

Title: Re: dumb question
Post by: murraygmc on November 16, 2008, 03:35:13 pm

whell thanks 4 the info guys