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My LQ4 427 build

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Old 09-27-2016, 05:17 AM
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Got it back on the road tonight and did some tuning and let me just say hot damn!

My truck is starting to feel like what I thought it would. The split fuel trims seem to be a whole lot better. For some reason right at 2400rpm cruise they start to deviate from each other by about 5% It must be attributed to the adjustable rockers. Been reading quite a bit on them lately and they say they can be a finicky b!tch. Everyone is saying they should be adjusted hot and pumped up to find their sweet spot. I'll have to do that one of these days before I go back to the Dyno cell for tuning. They are so quiet I can't believe it.

This thing actually has some torque below 3k now. I spun these 37's on the 1-2 shift like never before. I cannot wait to get a real tune on it. I must say, I would have never thought the lifter preload would cause this, but is makes sense as to why it would. Experience > instructions all day haha.

I also messed with the multi table to try and dial in the lean tip in off idle and it seemed to make a positive change right away tonight. I definitely need to dial it in some more, but it is leaps and bounds better than before.
Old 09-27-2016, 05:22 AM
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Oh and I switched to rotella t6 5w-40 after the cam swap. I seem to have a little bit more pressure when hot - according to the factory gauge it looks like 5-10psi higher at idle. Switched from RP 5w30 hps oil
Old 09-27-2016, 02:56 PM
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What are the specs on the new cam?

How close are you to Mesa? I'm out here on business for awhile.
Old 09-27-2016, 10:46 PM
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239/254 .624"/.595" 113+5

I'm really close to Mesa, but Mesa is kinda big. Where abouts are you staying while you're here for work? I'm actually in Tempe.

BTW - did some more tuning on the Multi table, lean spot is completely gone but I went too far in some areas so I need more time to dial it back. I can now punch it from a stop and roast the tires with ease, no brake stand. Also, I feathered into it and noticed I lose traction easily. and before I thought my trans shfted to harshly, but with this new found torque I think it might feel just about right.
Old 09-28-2016, 02:48 PM
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I'm staying on McKellips Rd. I was out in Tempe last night, went to a taco place... Fuzzy's. It was pretty damn good.

As for the cam... that thing is meaty, I bet it sounds real good.

You get that truck out in the desert much around here?
Old 09-28-2016, 05:39 PM
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I built it to take to Glamis CA Sand Dunes, and since I haven't installed the locker in the axle yet I really haven't taken it off road. I still need to install the bump stops before I really go ripping. I hope to have it all together by Halloween weekend.

The cam sounds great actually. I honestly feel like I could go bigger haha. With my valvetrain situation figured out I may throw the holley Hi-ram back on just to see what a difference it is. I have switching the manifolds down to a science so it wouldn't surprise me if I did it during a test and tune night down at the track.
Old 11-08-2016, 02:43 PM
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Nice thread - I'm currently pushing a 383 Stroker in my '04 Sierra RCSB but plan on dropping in a 427 this summer. Going to pick up a Dart short block and have my builder do the rest. The AFR heads I'm running now are actually meant for a larger bore so that'll save me some $ in the end. Just need to settle on a semi-aggressive cam that I can stand on my daily commute to and from work. Don't really drive long distances with it so...
Old 11-08-2016, 02:51 PM
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The BTR stage 3 for 400+ ci is really nice except mine is +5 instead of the +3 they advertise. You could just install it +2 and get the same thing I have. I have the stock ls3/l92 heads and stock L92 truck intake and it feels plenty strong. With the 5.13 gears I have serious traction problems on my 37" tires.

I just swapped out the 5.13's for 4.10's but haven't had a chance to drive it yet since I'm having a brake line issue. Ordered new lines to be here on Thursday. I want to see how the cam does with the gearing change, but I don't think it would be that drastic. My converter is pretty tight too, probably 2200-2300 stall
Old 11-22-2016, 06:56 AM
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I was looking at the BTR Stage 4 but not sure I want to rattle my bones quite that much. Tempting though...Finally got the 80e in and performing like I want - I'll have fun with it this winter and put some pennies away for the 427 short block. Just going to keep the beast NA for awhile.
Old 12-19-2016, 02:25 PM
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Ken how is the drivability of that BTR stroker cam? I drive my rig daily and have a 3600 stall. Out of all of the cams I have looked at this one seems to be the one to go with. They say it makes some serious power.

Also could you post an exhaust clip please?

Thanks


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