Tonyrodz
Resident Resident
They sent him the wrong one.
2007 Yukon Denali Build (This got outta hand really quick...)
- Thread starter 67RS427
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67RS427
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Correct box and part numbers on the tags but ultimately wrong part
I will add that it was a blessing in disguise because if I had the correct one the blower would be installed already. Instead I decided to pull the heads while I waited for the correct pipe to extract a bolt and I found the drivers side head barely torqued. In addition to that the head gasket was ready to blow at any time and if I added the blower it would have been done for. Now I went through both heads and installed new lifters and a few other things I would not have done otherwise. Now this motor will be ready for prime time and as much boost as I can probably throw at it with the stock LSA blower...
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67RS427
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LS7 Lifters/Guides (universal "upgrade" now), ARP Headbolts, Hardened Pushrods, GM Performance Valve Springs, Soda blasted both heads, New valve jobs and Cometic .060" MLS Head Gaskets ($100 each but drop my compression down closer to 10:1 for more boost)
All these things I wouldn't have done but I'm glad I did. Cheap insurance since I drive my cars/trucks hard every day. Valve train will be more stable for sure...
All these things I wouldn't have done but I'm glad I did. Cheap insurance since I drive my cars/trucks hard every day. Valve train will be more stable for sure...
Are those valve springs duals? And are you doing a rocker trunion upgrade or does that not apply to your heads?
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67RS427
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Not duals, just a good quality Beehive spring. Nothing crazy needed for me with the stock cam, just looking for more stability and replacing worn out 10yr old 150k mile springs... GM makes a great rocker and the Trunion upgrade is not necessary for my application. That only affected a few years and not needed for a stock cam. I will be able to meet and exceed my power goals with pulleys and wont really need a blower cam. I don't see myself spinning this motor much over 6,200rpm either, just not needed to make the power. Peek power is one thing, making power across the board is what counts.
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67RS427
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For those interested, here is my parts list... Not much to it. I shopped around for the best prices and did the whole thing for about $2,500.
*I'm trying to replace images that were missing or not showing up. If someone needs a parts list or help putting one together, just let me know...
*I'm trying to replace images that were missing or not showing up. If someone needs a parts list or help putting one together, just let me know...
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It's not necessarily the cam that makes a case for dual springs, it's the fact that you're adding boost to the equation. Stock springs, even GM Performance, don't have alot of seat pressure and if you factor in boost, I believe you might exceed that even at 8 lbs especially if you rev it high. I was told that if I don't want to pop a spring or drop a valve I'd better go with duals right away before something bad happens. And as far as the rocker trunions- better have another look at that as well. I checked, and your L92 has the same crappy design as my LQ4. Here's a link to a post at Performance Trucks where they talk about a failure with needle bearings all over the place in an L92. They installed the Comp Cams kit after the failure. Beware, if one does fail it will send needle bearings all through the engine due to the fact the stock design uses non-captured bearings. You might get away without these upgrades but I felt it's a gamble I'm not willing to take.
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67RS427
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None of the springs for a VVT motor have a lot of spring pressure on the seat... In fact, Comp Cams has 4 cam choices for VVT engines and most of the spring recommendations are single beehive springs like the one I will be using. The extra pressure is not wanted or needed on a VVT engine @ the seat. As far as the rockers go, as I said, there were a few years GM had issues with rockers and them failing. I'm not really worried about it and I would buy new rockers before spending $140 + my labor to retro fit an OEM rocker. Maybe I'm taking a big risk but I think I have covered almost everything important. I've heard of those comp kits coming apart as well. GM spent millions of dollars on R&D and have billions of these lifters out there making crazy power and running crazy high mileage with no issues. I don't expect any in my application when I will be well under 6,500rpm, not 6,800rpm+ like a lot of these guys running them.
The rocker trunion issue is well known but it's your engine. Pretty cheap insurance if you ask me. The rockers themselves are bulletproof and there's no need for aftermarket rockers that cost 4 times what that kit cost. I can tell you from what I saw when I did mine the Comp Cams kit is way better than the stock. I won't get into the part about the VVT engine not needing dual springs, I don't need to butt heads. I was just offering advice on what I've learned. Good luck.
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