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bradford · 08-24-2011, 01:34 AM

If Im not mistaken, 86 was the year they changed to throttle body injection.
This is also the year of the one piece rear main seal.
There are differences specific to these engines starting with the crank has a different bolt pattern at the back for the flywheel and the bolt in the front where the harmonic balancer is smaller.
Also, some have no mechanical fuel pump provision.
I believe the GM Goodwrench does have the fuel pump provision. I know all of this because I just put a new one in my truck this weekend.

08-24-2011, 01:34 AM	#2
bradford Registered User Join Date: Oct 2009 Location: North Carolina Posts: 151	Re: 1986 crate motor If Im not mistaken, 86 was the year they changed to throttle body injection. This is also the year of the one piece rear main seal. There are differences specific to these engines starting with the crank has a different bolt pattern at the back for the flywheel and the bolt in the front where the harmonic balancer is smaller. Also, some have no mechanical fuel pump provision. I believe the GM Goodwrench does have the fuel pump provision. I know all of this because I just put a new one in my truck this weekend.