ARP 4.320 in Bore Tapered Piston Ring Compressor - Billet Aluminum - Black Anodized 29022BK Replacement mechanical fuel pump diaphragm

Replacement mechanical fuel pump diaphragm and spring assembly for 12-327-30

15 x 4 x 9-3/4 in Oval Body

For improved lubrication there is an extra oil tract machined into the bottom of the housing that delivers oil directly to the cam and distributor gears

3/4 in Center Hole

but we think this should do it

ARP 4.320 in Bore Tapered Piston Ring Compressor - Billet Aluminum - Black Anodized 29022BK Replacement mechanical fuel pump diaphragmProduct Description: Piston Ring Compressor 4. 320 in Bore Tapered Billet Aluminum Black Anodized Sold Individually Since 1968, ARP is the fastener of champions and the world leader in fastener technology.