Maintenance suggestion request

Valves are hydraulic so they do not need to be relashed. TBI gasket is a good idea and maybe Tstat too. To visually inspect chain requires additional tear down and if you do, you should change the chain while it is apart. Do not use GM gaskets, use FelPro

Have them replace the valve cover gaskets. Instruct them to NOT use the rubber or cork at the manifold ends. Have them use a 1/4 inch bead of high-quality silicone. With 150,000 miles, a new water pump, roller timing set, and thermostat are a must. Have them use fel-pro gaskets everywhere. Since the pan will be loose to do the timing cover, also have them replace the pan gasket and rear seal.

Everything is under the assumption that you are willing to pay a good chunk of change to have it done. It is entirely up to you

Are you sure about the 1pc seal in '91? I thought it was mid '90's... I could be wrong, it happens once in a great while.

lol

Thanks to all who responded. I appreciate your help.

mark

Try 1986/1987 Production year. Hence the term 1986 & up Roller Cam Block.

Charles

I know the engine in my '88 was 2pc, and I have an engine out of a '90 that I am pretty sure is 2pc(I will check tomorrow).