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I just ordered one to try out. I will report my findings here.

I bet a double pumper would really benefit from this little dohickey.

Thanks for the response techinspector1. I will give it a try.

Looks like it would be easy to make a template and copy the design for other holleys I may end up owning.

I do plan to change over...

I saw an ad for these on facebook and I wonder if anyone has tried them.

https://www.thompsonperformance.com/

I have a holley 780 vac sec on a 454 and was considering giving them a try to see...