I have a 1986 convertible and am trying to figure out if it has a cast iron or aluminum head from the factory. Anybody know?

 

Aluminum heads have center bolt valve covers, steel heads have perimeter bolts on the valve covers.

 

Ill have to check it out. Hopefully aluminum so i can get that whopping 5 hp extra!!!

 

I believe all verts in 86 had aluminum heads. Take a magnet and see if it is pulled to the heads.

 

Not true on all 86's. Mine is an 86 and it has steel heads.

 

Magnet will stick if it is cast iron right?

 

Yes, but the dead giveaway is the valve cover bolts. Center or rim?

 

Ill look tomorrow, its at a friends shop

 

It depends.I believe the '86 had iron heads until February of '86.Check your tag on the inside of the driver's door.You should be able to tell.Good luck.

 

umm. Yea I saw this and checked mine. My car was made in november 1986 because I have the removable top and I took the felt off of it inside because its not a clear top and it said it was made in 11/18/86. I changed out valve covers but they are on the corners of the valve cover and the spark plugs I install are for cast iron. Why if my vettes a late 86 I guess have cast ironn? Will my VIN number help you guys help me figure out whats up?