Lou C
Supreme Mariner
- Joined
- Nov 10, 2002
- Messages
- 12,813
The pre-vortec engines also had center bolts holding down the valve covers, my pre-vortec V6 does, GM started using the center bolt design way before Vortec came on line. In that first pic I see one manifold bolt at the lower right side of the pic, and it is at an angle, this suggests to me that is is a pre-vortec engine. Vortec intakes had the bolts going straight down, pre-vortecs had them at an angle. Now it is possible to have a pre-vortec engine with a roller cam at least with the 4.3 V6s, mine has the roller cam, pre-vortec manifold and heads, and center bolt valve covers. In this pic you can see the center bolt valve covers, and intake bolts going in at an angle, this is a 1988 pre-vortec roller cam 4.3 V6.Lou cleaned it up, it's the intake bolt pattern. 8 vs 12. I'm quite sure he has Tbi heads but one never knows. And vortec heads vs tbi heads is a big deal in programming a file.
Again a picture of the intake/valve covers will define things so you can move move forward. Or just count the bolts holding down the intake.
8/vortec
12/ tbi
PS
I looked at the pix and its hard to see where the bolts are but judging by the shape of it, the intake looks like a Pre-Vortec, should have 12 bolts holding it down....
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