🏎️ Allstar Performance 1" Hi-Flow Carburetor Spacer - Boost Performance with the ALL25981 4150 Model Review

The machine does not work very well, but a little smoothing, everything will be fine. Both the bottom and top power helped.

Refined keeps heat away from the carburetor well I think the open design helps my double single manifold to work more efficiently

paired with it 0-83670 for Ford 400 6.6l. Consumption burns hot and carbs stay nice and cool. High clearance on 79 F250. It sits fairly high, so if you're having clearance issues, it's probably not the best choice. Otherwise, the more space, the better for carbohydrates.

I used this gasket on a customer's engine (499 Chevy) who liked the 4 hole 1 inch spacer best on the dyno. Most of the less expensive spacers are for the 1-11/16 throttle body used on the 4779 etc but not the 950hp used on this engine. This fit and worked perfectly.

My photo shows a problem after 3-4 hours of use (multiple sessions). It was mounted on a Holley 4150 (4801-1 to be exact) and aluminum intake manifold (1971 Chevy Corvette C3 LT-1). Of course there were aramid pads (Victor Reinz) on both sides with heat capacities up to 300°C (572F°).