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Re: '69 C10 327 SBC Off Idle Stumble / Misfire Help - I feel like I've tried EVERYTHI
Quote:
Originally Posted by Gromit
Noticed the crankcase breather hose is plugged in the photo - maybe that is just because you have it apart so just a reminder to have some means of venting the crankcase.. no venting could definitely cause tuning issues.
My 1970 350/350 truck has the stumble issue but not often enough to be a problem - I believe on mine it is the stock torque converter not very well matched to the torque curve of the cam. So the posters who have asked about your cam I would second their questions - your cam specs are important to have documented in solving your issue.
I can affect the stumble by adjusting my vacuum secondary rate but that adjustment seems to change with the weather..
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Gromit, that's correct, I have a breather with integral PCV valve in the passenger valve cover typically. It's plugged for the intake replacement only.
As noted, the cam is likely a stock or extremely mild grind, it has a smooth idle and no aggressiveness so I'd suspect a low end power range. I will probably be replacing the cam and valvetrain, possible aluminum free flowing heads too, after everything is ruled out. Thanks for your comment.
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1969 C10 Stepside (PERCY - tribute to CDE)
1996 Chevrolet Tahoe 2-door / 2WD LS5.3/4A (ROBYN)
1998 GMC SLE Regular Cab Short Bed Fleetside 4.3/4A (LUCY) (driver)
2000 JEEP Cherokee Sport XJ 4x4 4.0/4A (RUBY, son #2)
2013 VW GTI Driver's Edition 1.8T/6A (GRAU GEIST, son #1)
2016 BMW X5 xDrive50i MSport 4.4L N63/8A (SCHNEEWITTCHEN)
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