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#1
07-11-2007, 08:38 PM
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Both heads cracked on 97 Sierra
97 GMC Sierra with 160,000 miles
I've been chasing a misfire on #4 cylinder for a long time. Fuel and spark were fine so I took it to my mechanic for a compression leak-down and it showed an intake valve wasn't seating. Had the heads taken off and he said they're both cracked. What should I pay for a set of heads? Where should I look? I like the truck and want to drive it another 160,000 so I could use the advice. 
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#2
07-11-2007, 10:04 PM
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Re: Both heads cracked on 97 Sierra
Forgot to add that it's a 5.7L Vortec, code R
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#4
07-17-2007, 02:04 AM
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Re: Both heads cracked on 97 Sierra
I wanted to put Vortecs on my 383, but the local rebuilders advised against it; too many experiences with fragility.
I imagine later-model heads are improved, or maybe the aftermarket (World?) has something.
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#5
07-17-2007, 07:40 AM
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Re: Both heads cracked on 97 Sierra
A good repair shop should have some connections on cylinder heads.
Give you gm dealer a call and see what they have. They may have new head complete or blank new heads. MT
__________________
Remember proper testing gives us the answer to many problems. MT
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#6
07-18-2007, 11:18 PM
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Re: Both heads cracked on 97 Sierra
Quote:
Yeah, I believe the new GM blanks are a few hundred a piece. But, at least you know they're new, and they're OEM. Another idea.....I know I can go down to just about any machine shop in my area and purchase a set of R heads rebuilt from the machinist. They're so popular that dang near everyone has them.
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