ARP 135-3701 Head Bolt Kit for CHEVROLET Big Block 12pt ymm_46 The change in performance is

The change in performance is a noticeable factor when compared to the stock exhaust system configuration

Impala 1958-1985

Fits Following Engines: 410 CID Ford FE V8

000˝ Thread Size 1 3/8˝ UHL 2 (Qty: 2) 1

ARP 135-3701 Head Bolt Kit for CHEVROLET Big Block 12pt ymm_46 The change in performance isIt is for good reason that virtually every top professional engine builder relies on ARP Pro Series head studs for their all out competition powerplants. Simply stated, theres not a better stud setup on the market today. For openers, ARP uses a premium grade 8740 alloy that is rated far superior to aircraft quality. Each stud is placed vertically in special racks and precisely heat treated to 200, 000 psi. This procedure ensures complete heat