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Discussion Starter #1
My buddy has a set of 98 vortec heads and wants to put them on a Pre 87 motor. Is there anything special he needs to do other than buy an intake manifold to match the heads? He told me that the coolant ports in the heads are triangular and the block they are circular.
 

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That's what I was thinking just wanted a 2nd opinion.
 

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You also need self-aligning rockers and center bolt valve covers, if the heads don't come with them, and the engine they're going on is pre-'87.
 

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Discussion Starter #5
Have a set of factory valve covers. NSA rockers with guide plates can still be used right?
 

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Yes, they are a bolt-on. They are great heads.

You can use NSA rockers and guide plates if you have the rocker studs pulled, tap the heads for screw-in studs and have them machined down for the plates.

I would also have the guides machined down for more retainer to seal clearance so you can run a bit more lift. Also, LS6 springs with Comp 787 retainers are a drop-in for the Vortecs. The stock Vortec springs are terrible...
 
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