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L
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Send PMPrinceton, WV - USA
Joined: 9/29/2010
Posts: 17
Vette(s): A 1986 coupe currently with 60,000 miles, purchased in August of 2010. G44 - Rear axle 3.07 ratio, Z51 - Performance handling package, FE7 - High performance suspension, FG3 - Preloaded gas shock absorbers, to name a few.
Can someone tell me when in the production run the change was made from cast iron to aluminum cylinder heads? I'm pretty sure mine was fairly late in the run but would like to know for sure. The last 5 numbers are 19445 if that helps.
Thanks,
Lenny
Thanks,
Lenny
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J
Hi Lenny. I don't know when exactly in the production run, but I can give you an easy way to tell. If you have center bolt valve covers, then you have aluminum heads. If you have bolts on the outer edges of the valve covers, then you have the cast iron heads.
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22714
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
They did have issues with cracks around the head bolt bosses, so the heads were delayed. ALL convertibles did come with the aluminuminum heads, and the LATE coupes. I'm not sure when the exact date was, either. And..if counting the bolts that hold the valve covers on is too hard, just stick a magnet on 'em...
Joel Adams
C3VR Lifetime Member #56 
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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L
Free Member
Send PMPrinceton, WV - USA
Joined: 9/29/2010
Posts: 17
Vette(s): A 1986 coupe currently with 60,000 miles, purchased in August of 2010. G44 - Rear axle 3.07 ratio, Z51 - Performance handling package, FE7 - High performance suspension, FG3 - Preloaded gas shock absorbers, to name a few.
Thanks guys. It has the bolts in the center of the valve covers so I guess that means it has aluminum heads.
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e
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Send PMLanoka Harbor, NJ - USA
Joined: 12/21/2006
Posts: 2191
Vette(s): 1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c
hmm..i thought all tpi engines had aluminum heads.
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22714
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
Nope...not until '86, and then only after they got the broken bolt bosses figured out. By the time they did that, they were also ready to start building the convertibles, so all of the convertibles had the alum heads. I'm sure there is specific info somewhere on the VIN/date break.
Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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in Forum: C4 Engines, Driveline and Handling
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