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351c 2v Cam advice
#31
The backfires indicate a lean condition. I would start with accelerator pump, although I would probably go through the entire carburetor, check all passages, jet sizes, etc. New does not mean correctly assembled/inspected. There might be debris in it from assembly or installation. The RPM range you're having problems with could indicate a problem in the transfer slots.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#32
The backfires were before I tuned the mixture screws and timed it, so I wouldn’t count that on the list of symptoms. And yeaaaa I've been thinking I oshould tear it down and put it back together to make sure, just been procrastinating since its my daily driver. Thanks
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#33
(05-08-2019, 03:45 PM)ianpala Wrote: The backfires were before I tuned the mixture screws and timed it, so I wouldn’t count that on the list of symptoms. And yeaaaa I've been thinking I oshould tear it down and put it back together to make sure, just been procrastinating since its my daily driver.  Thanks

That carb and basically all Holley style carbs made since the 90's have a backfire protection check valve so it is extremely unlikely the power valve diaphragm is ruptured.

73 conv. 460, D0VE large valve heads, Performer RPM manifold, Voodoo 227/233 cam, Holley 950 HP carb, C6 trans, 3.25 trak-loc.
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#34
Most aftermarket carbs are shipped rich, it is safer than lean. Try dropping the primary jet size 2-4 numbers, readjust mixture screws and see if things improve. Chuck
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