WebAug 2, 2005 · 4,018 Posts. #11 · Jul 29, 2005. Well, technically you would need a head to flow 275cfm on the intake to make 550hp. A 781 will flow that much with bigger valves but at more lift than an after market high performance head. And more lift is harder on the valve train and requires more expensive parts. WebMar 16, 2011 · Here you go..... Chevrolet Big Block Cylinder Head Casting Numbers. RECTANGULAR PORT - Valve size 2.19 intake, 1.88 exhaust Casting Years CID Chamber CC HP/RPO/Comments. 3856208 1965 396 Closed 109cc 375hp/425hp z-16 chevelle. 3873858 1966-67 396/427 Closed 109cc 375 L-78.

Big-Block Chevy Cylinder Heads - Budget-Minded Performance …

Webbig block chevy parts (fayetteville, NC) Cleaning out the garage, big block Chevy parts that I wont be using;1. big block chevy heads, 353049 dated 73, rusty but should clean up $140 2. big block chevy, 3993820 dated late 70, rusty but should clean up $140 3. Complete set (8) of used bbc connecting rods with old pis ... WebPARTS INTENDED FOR COMPETITION USE ONLY. 454 Big Block Chevy Engine Carl Junction, MO $2,750 Big Block Chevy W/ Snowflake Heads Oologah, OK $6,500 496 Chevy Big Block Viola, KS $12,345 Big Block Chevy Parts .427 Tall Deck Std Bore Block,unnel Rams,valvecovers, And More Andover, KS $500 Big Block Chevy 366 … continuity warframe trading

781 casting BBC heads - Don Terrill’s Speed-Talk

WebJul 18, 2012 · With peak intake flow numbers of 384 cfm, the heads we capable of supporting over 750 hp, but on our 496 manage 691 hp and 603 lb-ft of torque. The PowerPort heads shared the large (122cc ... WebMay 18, 2006 · Dec 9, 2003. 846. Huntsville, Alabama. I know the 049 and 781 oval heads are the ones to have BUT I have a chance to buy a set of 3993820 o-ports that have been opened up a little. They have 2.19./1.88 valves, lunati solid roller double springs to 700. I can get these heads,with a BIG lunati roller (.700) with lunati lifters (new) for 500 bucks ... WebFind many great new & used options and get the best deals for Big Block Chevy Oval … continuity washer needed on mercury prop