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Got 308 v8 in nissan patrol running 600 cfm holley running to rich is carby to big

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Get it jetted right and it will probably pass
308 would work best on a 450 -550 holley
running rich could be
float levels too high
excessive fuel pressure --use a regulator in the fuel line
damaged power valve diaphragm-- subject to burning holes in the diaphragm on back fires
the idle mixture screws incorrectly adjusted
there are speed shops with chassis dynos that will be able to tune the carby correctly so talk with them about the carby size and the problem

Posted on Dec 31, 2016

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Posted on Jan 02, 2017

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