ckwhite

I'm getting so much conflicting information from different sources. So, when did GM begin putting aluminum cylinder heads on the L98 engine? Was it "always"? Or did they start putting Al heads on it in a particular model year? I've got an '89 L98. Does mine have aluminum heads? Was this a good idea - or?
Thanks!

mcm95403

Not to be a smart-alec, but a magnet is an easy way to check.

JrRifleCoach

Mid year 86 started the Al heads.
That was the end of iron heads.....forever (for Corvettes)

vetteoz

It " should " but anything could have been done to the engine in 23 years

Pres712

The aluminum heads started with the '86 convertibles and later in the year went across the board.

WW7

As far as stock heads go.
Perameter bolt heads are steel
Center bolt heads are aluminum......WW

ckwhite

1986. Well, that locks it in, pretty well. Thanks to all of you for your responses. Yeah, I might be able to use a magnet to check the heads if my car were not at the shop in Auburn, about 80 miles away... Haven't seen it in a month. I just write checks when they ask for more $.
Craig

ch@0s

E86 had iron heads.. L86 and 87 vetes got the 128 aluminum heads. In 88 they went to the 113 heads and are the same heads used on the ZZ4 crate motors. When My 91 had the stock heads I could see the las few numbers of the casting In the oil filler neck.
What are you having done to the car?

65Z01

Indeed your '89 Vette came with #113 D-port Al heads; if you pull a valve cover you will see on the head a P/N ending in 113.

ghoastrider1

the last 12,000 vettes built in 1986 came with the AL.heads.