The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

80SPORT · 06-24-2013, 02:08 AM

The 86 was a transition year as mentioned.

1 piece rear seal but old style intake mount..and mech fuel pump.

We used lots of the 86 GM service replacement motors because you would get the 1 pc rear seal....no more rear oil seal leaks ...but could use the old style intake and a mechanical pump.

All you have to do is use the i pc flywheel/flex plate and it fits back to 1955.

The part # in my files is 12568759 for a brand new long block.

06-24-2013, 02:08 AM	#9
80SPORT Registered User Join Date: Mar 2008 Location: red deer alberta Posts: 777	Re: 1986 crate motor The 86 was a transition year as mentioned. 1 piece rear seal but old style intake mount..and mech fuel pump. We used lots of the 86 GM service replacement motors because you would get the 1 pc rear seal....no more rear oil seal leaks ...but could use the old style intake and a mechanical pump. All you have to do is use the i pc flywheel/flex plate and it fits back to 1955. The part # in my files is 12568759 for a brand new long block.