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Old 06-20-2014, 09:33 PM   #21
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Originally Posted by NSP-Jake View Post
Threads changed in 2004 to a coarse M11x2.0 - believe me, I have a 2004 Deville in the shop right now and it has these M11 bolts. This one still had tight bolts. A 2005 I recently had done, had 5 bolts pulled (also coarse thread). A 2006 again, all tight. It'* hit and miss with thread failure. GM'* warranty division paid for it.
According to Gm service manuals mid 90s blocks through 2004 changed through out the year. For example 98yr bolts are 10x1.5, 2004 bolts on the top are 8x1.25 and the bottom row 10x1.5. 2005 was the year change 11x2.0.

The hg repairs on these cars are good money makers, but I would never own one. Putting myself in the customer shoes spending 5 grand on a hg and thread repair. Comes back months later with bolt/* pulled. What do you tell them now since they just spent over what the car is worth. You just admitted they are hit and miss. 50/50 imo.
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Old 06-23-2014, 10:50 AM   #22
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According to Gm service manuals mid 90s blocks through 2004 changed through out the year. For example 98yr bolts are 10x1.5, 2004 bolts on the top are 8x1.25 and the bottom row 10x1.5. 2005 was the year change 11x2.0.

The hg repairs on these cars are good money makers, but I would never own one. Putting myself in the customer shoes spending 5 grand on a hg and thread repair. Comes back months later with bolt/* pulled. What do you tell them now since they just spent over what the car is worth. You just admitted they are hit and miss. 50/50 imo.
When it comes to the Northstar 93-03 were all M11 x 1.5, Jake was saying the 04+ Northstars are hit and miss with head bolts, thats when they upgraded to the M11 x 2.0 threads, they seem to hold better but still have failures. Our cylinder head studs fix that problem, you will never have pulled bolts again, and we charge $2000.00 flat for HG job and $2500 flat for HG and Full bottom end re seal, these engines have tendencies to leak oil.
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