Nice piece, i should have filed a patent 6 years ago when I came up with the same idea and made my own to fit a 4150 on my M1 4500 intake. The pic shows the combo plate and a 4 hole spacer.

Made mine for the price of scrap aluminum 1/2" plate and my Dad's time on the mill. He has since retired and so did my freebies with the mill until I get my own unit.

You would have probably spent more getting the patent than it would have made for you, it's not a spacer design that is overly prevelant.

Regardless, a clever solution to a problem. Although changing over to a dual pattern base plate is another way of getting the same result. The 4150-4500 spacers I've made took advantage of that.

True on the ROI. It was more in jest than an actual hand to forehead moment.

I saw a problem and was determined to make it work without spending more coin on a newer carb base.

Real simple solution would be to run a Dommy and be done with it all together. 😀

The 540" B1 in my Savoy has an adapter to a 4150 for NSS type stuff. Runs 8.90/5.70 at 3450 that way.