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Originally posted by betterthanyou
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He's already drilling and helicoiling them... so whats the difference in drilling and then just re-tapping for 10mm... I agree with 3400beretta....
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3500 Build, Comp XFI Cam 218/230 .050 dur .570/.568 lift 113LSA
Fully Balanced, Ported, 3 Angle Valve Job, 65mm TCE TB, S&S Headers.
Stage-1 Raybestos/Alto 4t60e-HD, EP LSD, 3.69FDR
12.61@105 Epping NH Oct 2015 Nitrous 100shot (melted plugs) 13.58@98.8 N/A 3200LBS -
1 degree angle differnce can create more problems. Rocker arm geometry is crucial.Ben
60DegreeV6.com
WOT-Tech.comComment
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This is true, centering the hole would be the hardest part I guess... BUT when removed from the car this task is easy to do in a machining environment.
Got Lope?
3500 Build, Comp XFI Cam 218/230 .050 dur .570/.568 lift 113LSA
Fully Balanced, Ported, 3 Angle Valve Job, 65mm TCE TB, S&S Headers.
Stage-1 Raybestos/Alto 4t60e-HD, EP LSD, 3.69FDR
12.61@105 Epping NH Oct 2015 Nitrous 100shot (melted plugs) 13.58@98.8 N/A 3200LBSComment
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Is there the same amount of material to put the larger bolt in? I mean is the cast the same, they just went with a smaller bolt on the new heads?sigpic
New 2010 project (click image)
1994 3100 BERETTA. 200,000+ miles
16.0 1/4 mile when stock. Now ???
Original L82 Longblock with LA1, LX9, LX5 parts
Manifold-back 2.5" SS Mandrel Exhaust. Hardware is SS too.
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I think... Dont quote me on that though.
Got Lope?
3500 Build, Comp XFI Cam 218/230 .050 dur .570/.568 lift 113LSA
Fully Balanced, Ported, 3 Angle Valve Job, 65mm TCE TB, S&S Headers.
Stage-1 Raybestos/Alto 4t60e-HD, EP LSD, 3.69FDR
12.61@105 Epping NH Oct 2015 Nitrous 100shot (melted plugs) 13.58@98.8 N/A 3200LBSComment
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Think I like the 10mm rocker arms and studs replacement idea, I'm just not sure if I should do this proactively or hold and see if the helicoil holds this time around. Theoretically, the helicoils should be just fine...
The shop gave me back the broken helicoil. There were two halves of the coil and what looked like a few shattered remains of some of the middle coils. Shouldnt have thrown away the pieces so quickly, as I'm trying to get in touch with an Emhart engineer to do some failure analysis. Apparently, there is a specific helicoil for use in aluminum, and maybe the failure is consistent with the wrong helicoil being used. If someone from Emhart gets back to me, I'll let you guys know what they say.
Another data point observation: Last time this happened the rocker arms ripped out of two cylinders at the same time. I could understand one getting overloaded, but two together? Odd.
Thanks guys, I've been boasting at work about how much knowledge the users on this forum have./* James Kuo */
Picture a full, 8-passenger, stock 2003 Montana with luggage overflowing to the roof rack, towing a jet ski, at 80MPH.Comment
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What valves are the affected ones? Intake or exhaust?sigpic New 2010 project (click image)
1994 3100 BERETTA. 200,000+ miles
16.0 1/4 mile when stock. Now ???
Original L82 Longblock with LA1, LX9, LX5 parts
Manifold-back 2.5" SS Mandrel Exhaust. Hardware is SS too.
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Intake on cyl 6 this time and last time.
Don't know about cyl 4 last time./* James Kuo */
Picture a full, 8-passenger, stock 2003 Montana with luggage overflowing to the roof rack, towing a jet ski, at 80MPH.Comment
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Helicoil called back quickly. Stainless steel helicoil should be fine in aluminum, temperature not an issue up to 800 degrees./* James Kuo */
Picture a full, 8-passenger, stock 2003 Montana with luggage overflowing to the roof rack, towing a jet ski, at 80MPH.Comment
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