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Old 12-03-2016, 11:22 PM   #124
'63GENIII
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Join Date: Sep 2008
Location: San Carlos, Ca.
Posts: 3,048
Re: L29 454 Build for '63 K15 with NV4500

Quote:
Originally Posted by MTCK View Post
Oh and stumbling when leaving from a stop is likely acceleration enrichment. Manual trans motors ramp up load really quickly when you let the clutch out. IIRC the AE has a stupid long delay on these motors from the factory. My "hot" Howell tune was bone stock with a couple more degrees of timing at high rpm. Never ran quite right until I had it tuned.
The stumbling thing is new. Its not dying like it used to but now its stumbling and lost any throttle response that it had. As if it was running out of gas with a carb...pump the gas a little and it gets above 1000 rpm and its fine. Does it in neutral as well. No load. Weird.

Only code is the crank position switch again. Not sure how it lost it after I did the relearn but I don't think it would affect the fuel pressure. Supposedly counts misfires by crank angle. Didn't really notice a difference after it had relearned it the first time. I would have reset it today but its kinda tough to find a place to twist it to 5800 in neutral without turning a few heads. LOL. Besides, it gives me the willies to do it anyway. Lots of rotating mass in that new engine!
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Chris


'63 k15 long step
Vortec 7.4 - L29 Blackbear tune, Five 0 Motorsports injectors, Chris Straub Cam, NV4500, divorced 205
52" front and 63" rear spring swap
D44 / 14bff - disc axles
Milemarker 9K and 10.5K hydraulic winches

63" & B52 Spring Install http://67-72chevytrucks.com/vboard/s...ng+swap+thread


NV4500 Reverse Build Thread http://67-72chevytrucks.com/vboard/s...=reverse+build

L29 - 7.4 Vortec Build http://67-72chevytrucks.com/vboard/s...&highlight=L29
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