ARP 134-7402 Thermostat Housing Bolt Kit for CHEVROLET LS. 20mm UHL. 8740. hex ymm_46 Special features include 1/4" thick

Special features include 1/4" thick

Fits Following Engines: 409 CID Chevy Big Block V8

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this link pipe set has no catalytic converters and delivers an impressive increase in performance

ARP 134-7402 Thermostat Housing Bolt Kit for CHEVROLET LS. 20mm UHL. 8740. hex ymm_46 Special features include 1/4" thickNow you can use premium quality ARP stainless steel or chrome moly fasteners to install most anything on a car, boat or trailer. The specially alloyed ARP 300 stainless steel and heat treated 8740 chrome moly bolts (black oxide finish) are nominally rated at 180, 000 psi tensile strength to provide a substantial extra margin of safety over Grade 8 hardware. Whats more, you cant beat the gorgeous looks of ARPs specially polished stainless steel