Quote:
Originally Posted by 39deluxecp
the power valve is a 6.5 from the factory. the engine has 14" of vacuum at idle. so the power valve should be okay, right??
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Should be -
https://www.holley.com/blog/post/hol..._valve_tuning/
It only does it while under load on the highway? Are you sure of the DIST ADV CURVE? Have you plotted manifold vacuum (on the road)? Are you using manifold vacuum or ported vacuum as a DIST signal source?