Alum Heads?

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Apr 17, 2005 | 11:17 PM

johnash

Thread Starter

Racer

Joined: Oct 2004

Posts: 288

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From: Somerset PA

Alum Heads?

Ok, this may be a stupid question, but how do I know if my 89 Z51 coupe has alum. heads?

I went to buy spark plugs, and everywhere I go to check what plugs to use, I get the same question, alum or iron heads... I'm guessing they're cast iron, but I want to be sure...

Thanks, and sorry for the stupid question!

Apr 17, 2005 | 11:37 PM

corvetteronw

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Joined: Feb 2003

Posts: 16,475

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From: Kingman AZ

Cruise-In VII Veteran

Cruise-In VIII

St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16

All 87 to 96 used aluminum heads (unless someone put on aftermarket iron heads). Try a magnet to make sure.

Apr 18, 2005 | 01:13 AM

yellowlust

Burning Brakes

Joined: Jan 2003

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From: Portland OR

Don't forget the 86s. All the convertibles and some of the coupes.

Apr 18, 2005 | 02:11 AM

vettefun

Racer

Joined: Mar 2005

Posts: 433

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From: Miami Florida

Quote:

Originally Posted by yellowlust

Don't forget the 86s. All the convertibles and some of the coupes.

I think the coupes released in late 86 with aluminum heads.

Apr 18, 2005 | 10:01 AM

aj1988

Melting Slicks

Joined: Mar 2002

Posts: 3,252

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From: The Colony Tx

If you pull the valve covers there is a stamping number that you can use to cross reference. Unless they have been changed they should be cast.

Apr 18, 2005 | 10:15 AM

lensvet

Instructor

Joined: Jul 2004

Posts: 248

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From: HERNANDO FLORIDA

St. Jude Donor '05-'07-'08

The lazy mans way is to use a magnet.

Apr 18, 2005 | 01:14 PM

6spd 1990 Cpe

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Joined: Aug 2004

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From: Motor City !! Mi

I thought the bolts for the valve covers on the aluminum's were down the center of the valve cover & for the iron heads the bolts were on the outer edges of the valve cover ? Is this correct ?

Apr 18, 2005 | 01:20 PM

tpi1986

Racer

Joined: May 2004

Posts: 305

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From: Martell NE

Quote:

Originally Posted by 6spd 1990 Cpe

I thought the bolts for the valve covers on the aluminum's were down the center of the valve cover & for the iron heads the bolts were on the outer edges of the valve cover ? Is this correct ?

Center Bolts are Alm-Headed. All past feb of 86 have alm heads.