GM HEI Distributor Vacuum Advance Block-Off Plate - Clockwise Rotation

Lock out the vacuum advance on your GM HEI distributor with this direct bolt-on block-off plate from Top Street Performance. Designed for standard clockwise-rotation TSP and GM HEI distributors, this plate installs in place of the vacuum advance canister, eliminating unwanted timing variation for racing and performance applications where fixed timing is required. No welding, drilling, or modification needed — it bolts directly into place for a clean, professional result. Compatible with 6- and 8-cylinder applications. 

COMPATIBLE WITH
Universal — verify distributor rotation direction before ordering

NOTES
• TSP and GM High Energy Ignition (HEI) distributors — clockwise rotation
• 6-cylinder and 8-cylinder GM engines equipped with HEI distributor
• Not compatible with counter-clockwise (reverse rotation) HEI distributors

SPECIFICATIONS
Color: Silver
Distributor Type: HEI
Length: -
Material: Steel
Material Thickness: -
Mounting Hole Quantity: 3
Rotation: Clockwise