Vortec heads

[Jcris]

I have a 1996 Glastron with a 4.3l Mercruiser and am wondering how I can be sure it has Vortec heads? I usually read this forum to gain insight on repairs and maintenance and I came across a thread, from a knowledgeable member, that indicated that some heads for these motors were not necessarily Vortec's.
How can I tell?

 

[Scott Danforth]

8 intake bolts = vortec heads
12 intake bolts = non-vortec heads

 

[Rick Stephens]

Count the bolts on the intake. The Vortec has 8 total, the pre-Vortec has 12 total.

 

[Jcris]

Thanks guy's,
Just counted them. Looks like I have Vortec heads. Cool!

 

[Fun Times]

Post the engine serial number.

 

[bruceb58]

Typically, boats didn't get them until 1997 so you have to go by the serial number or count the bolts. If you really counted 8 then they are Vortec.

This where the holes are for a pre-Vortec on the gasket
http://www.michiganmotorz.com/intake...985-p-645.html

This is for a Vortec
http://www.michiganmotorz.com/intake...ent-p-643.html

This is a pre vortec manifold
http://www.michiganmotorz.com/edelbrock-performer-intake-manifold-1985-p-4370.html

Vortec Manifold
http://www.michiganmotorz.com/edelbrock-performer-intake-manifold-1996-current-p-4371.html

 

[Jcris]

Great info , thanks bruce