Originally Posted by fast68plymouth
It seems like the dual bolt pattern 4150 carbs have been gaining in popularity……so I’m surprised that Holley/QFT decided to discontinue this item.

I guess that’s why I’m not a marketing expert.


I've been making carb spacers for local engine builders for a number of years. I've been asked twice to make a 4150-4500 spacer. I haven't bothered making them a stock item for that reason.

Alan Jones