RPC Copper Collector Gasket Inside Dia 2.5" #R7501X 5633100 1 x 1/2" (F) x

1 x 1/2" (F) x 3/8" (M) Adaptor

HEDMAN HEADER FLANGE Gaskets for CHEVY 396-454 and ZZ502

The bore diameter size - 105mm

010" thick

RPC Copper Collector Gasket Inside Dia 2.5" #R7501X 5633100 1 x 1/2" (F) xRPC Exhaust Header Reducers are a must when updating your exhaust system or just simply adding or replacing a set of headers. These header reducers are made from heavy gauge aluminized tubing and designed for headers with a 3 bolt triangular flange. RPC Collector Gaskets will keep all exhaust gases flowing through your headers, not around the flange, for a leak proof seal. Each header collector gasket is made of the same copper high temperature