Pacemaker - PH 5302 Chevrolet 283-400 Small Block V8 1 5/8" Tri-Y To Suit Holden HK-HT-HG (PH5302)Holden HG HT with Chev Small Block. Manual & Automatic. TRI Y Design. Part #: PH 5302 P Steering: No Gasket: DSF 9 Air Con: N A Primary Pipe: 1" (41mm) Oxy Sen: N A Secondary Pipe: 2" (51mm) E. G. R: N A Outlet: 2" (57mm) Y Branch: N A Fitting Time: 3 Hrs Note: If required with alt. bracket on LH side order PH 5303 Will fit slant plug heads Will fit Powerglide automatic Will fit Turbo 400 automatic if vehicles floor has been cut for correct fitment of