5 to 1, cam somewhere in the 230-240 duration and lift in the mid-500's on a 113-114 centerline, Edelbrock air gap intake, Holley 850HP carb, headers with x-pipe exhaust. 33 posts Previous 1 2 3 Orr89rocz HotPass Posts: 2071 Joined: Mon 1:25 am Location: Re: BEST HEADS FOR 421 SBC. sa gear billet timing set with torrington bearing and rolon chain 9 keyway. ATI 8" converter, flashing to about 4700 right now. With 383 cubic inches, you also get a broad torque band that peaks at 435 lb,-ft, at 4000 rpm with 340 horsepower at 4500 rpm. IMHO The 414 or the 421 is a much happier engine over a 434 using a 9. Eagle 12132 SBC 415 421 Rotating Assembly Kit 12. 875 stroke 400 mj Plus, you're going to have to grind your pan rail area for counterweight clearance. Best heads for 421 sbc The HT383E offers you the same brute strength of our HT383: forged steel crank, 4-bolt main cast iron block, and a camshaft designed for towing and hard work.
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