the perimeter bolt provisions that the fastburn and World Product heads have? The stock center bolt vc I have will not correctly seal because the screw hole on the heads interfer with the vc's. you can vaguely see it in this picture.

 

is the head made for both? if so and you want to keep the center bolts grind off the boss for the other set up.

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ICON Motorsports
1st & 3rd

 

Yep, that's the deal. I found out the hard way too. World does not tell you anywhere in their literature that in order to use CB covers, you must grind away the bosses for perimeter bolts. If you have installed the heads on your motor already, get perimeter covers.

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FORMULA 350 TK
Southern California 3rd Generation F-Body OrganizationŠ

 

arrgggghhh thats what I thought. I'm not sure though but someone told me that the corvette lt1 and lt4 centerbolt valve covers MIGHT work because they don't have the inner or outer lip. Can anyone verify this?

 

I had to use the LT4 corvette composite black valve covers for my TF heads for the same reason, so it should work for you. These should be the correct part #'s:

Drivers - 12552322
Passenger - 12552321

If you are retaining the stock PCV system, you will need to drill a hole into the passenger side cover, and stick a grommet into it. Very easy.

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1989 IROC-Z 5.7L