This is a drag race only carburetor spacer, 0.5 inch thick, molded from gray plastic in a 4 hole (divided) plenum style for high flow.
Spec Sheet: Allstar Spec Sheet
Compatibility
Built for 4150-style square bore carburetors. This is not compatible with 4500/Dominator flange carburetors. Labeled by the manufacturer for drag race use only.
FAQ
What carburetor flange does this spacer fit?
It fits 4150-style square bore carburetors. It is not compatible with 4500/Dominator flange carburetors.
How thick is this spacer?
It is 0.5 inch thick.
What does "4-hole" style mean?
The 4-hole style has a divided plenum, unlike the open style version which has no center divider.
Is this street legal?
No, this spacer is labeled by the manufacturer for drag race use only.
How does this differ from ALL25980 and ALL25984?
This spacer is the 4-hole style at 0.5 inch thick. ALL25980 is the open style at the same thickness, and ALL25984 is the 4-hole style at 1 inch thick.

