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There have been multiple threads/posts on what fuel to feed the 6.2 beast. Since GM only recommends premium fuel, it’s become a gray area and most people don’t like gray areas. Not surprisingly, there are passionate opinions on either side. I for one am a facts guy and prefer to go with actual numbers rather than some romantic notions of what someone thinks. It turns out this experiment has already been done for the L86 engine. Our engine is the L87 but it makes the same power and torque as the L86 and it seems the only difference is the addition of DFM for the L87.
1. Knock: No audible knock was observed with regular fuel.
2. Power: Reduction in power was average of 0.7% which evaluates to 2.94hp. I was actually quite surprised by this, I was expecting more. If you claim you can tell a 0.7% difference, then more power to you.
3. MPG: The biggest gain was fuel economy. They recorded an average of 7.1% reduction in mpg with regular. If you live in an area where premium fuel cost is less than 7.1%, then by all means go for it. Where I live, premium is $15 more on a $45 regular fill-up.
I’m not here to tell you what fuel to feed your 6.2 but if you prefer numbers like me, then maybe this can help you make an educated decision. Will probably get some flak for this but that’s ok.
Replaced the stock muffler with the Magnaflow 11229 which has 3” in and out. Initially, the exhaust shop removed both flappers. It sounded very deep and rumbly but a bit louder than I preferred. The drone especially on the highway was unbearable.After emailing Magnaflow support, they recommended I have the shop put the flappers back on so I had both flappers welded back in. The flappers completely eliminated the drone but did quiet down the muffler quite a bit. Now, it’s about 70% as loud as the GM performance exhaust which is the perfect level of loudness I was aiming for. I didn’t want anything obnoxious. Sounds really good when you put your foot in it. Cold start (attached) is equally as lively.
If you find the GM performance exhaust a bit too loud for you, then this mod will be the perfect volume level. Just save yourself the headache and money by having the shop install the flappers from the get go. Cost me $220 for muffler and install. $80 to weld the flappers back in. All in all, very pleased with it.
Hey guys, I'm trying to determine if an l86 intake bolts up fine to the stock l83 heads?
Reason i'm asking is I have a chance to get a blower kit at a crazy deal from local shop but its for a 6.2 truck. I'm not worried about tuning as it will be dyno tuned, just wondering if I'm going to run into issues with ports not lining up or if they'll even bolt together.
Thanks in advance
Always Start with disconnecting Battery Terminal.
REMOVE AIR BOX ASSEMBLY.
Disconnect Vacuum push connections A's. Unscrew Air Box from Throttle body. Pull away from Manifold.
4. Unscrew MAF using Torques bit.
5. Pull up on red tab on MAF. Press and pull up to remove.
6. Unscrew C-clamp on filter box and remove assembly.
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