Re: Power valve?
 

I always blocked the PV on my carbed stocker. You have a different load now compared to when it had a converter.

Sean

Re: Power valve?
 

I have had quite a few alky carbs seen and rebuilt others for friends and have NEVER seen one with a Primary or otherwise PV! Not sure it's real common?

Re: Power valve?
 

Thanks,Sean. I wondered if that's the problem,the converter flashed to around 5,800. Thanks.

Re: Power valve?
 

BLP and APD both use primary power valves with Methanol. I should have said, "power valve usage with Methanol in common with BLP and APD"

Yet, I am off subject for the original question, I apologize.

Re: Power valve?
 

Your running on the transition circuit in the pits, it's prob lean. Power valve has nothing to do with that unless it leaks. Then it will pull fuel down the vacuum port behind it.

Re: Power valve?
 

My APD HP1000 methanol carb has never had a power valve in it. I've had 3 methanol carbs over the years, and none have used power valves.

Re: Power valve?
 

Take it out and plug it. It does not affect idle or transition to the booster. Yes it works on engine vacuum ,but it only richens the mixture when the vac is low and the engine is pulling fuel thru the boosters. You should bump your primary jet size up if you do take it out. on our 585 we usually go 76 pri and 78 sec. 396 motors 78 pri and 80 sec.

Re: Power valve?
 

Thanks for all the replies,they give me some good direction on fixing the problem.