Thread: What size carbs for blown 454?

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I am currently building a 454 chevy big block with a forged crank, h beam rods, forged pistons, roller rockers, hydraulic roller cam with about 5.70 lift, 8.0:1 flatop compression, large oval port heads w/ 2.19 valves, 8-71 weiand blower running about 8lbs of boost. This will be in a 70 chevy nova. It will be used for street and some strip use. Any suggestions on what size carbs to use? Also, is there a formula for carb sizing with forced induction? Thanks!!

i have used 750 edelbrocks i like them

Blown CFM=(CID x RPM) / 3456 x (BOOST / 14.7) +1

454 x 6,000 / 3456 =788.19

8 / 14.7 = 0.544 +1 = 1.544

788.19 x 1.544 = 1,216.96 CFM


454 @ 7,000, 8 lbs = 1,419.80 CFM
454 @ 8,000, 8 lbs = 1,621.20 CFM

Originally posted by 70_"SuperNOVA"
I am currently building a 454 chevy big block with a forged crank, h beam rods, forged pistons, roller rockers, hydraulic roller cam with about 5.70 lift, 8.0:1 flatop compression, large oval port heads w/ 2.19 valves, 8-71 weiand blower running about 8lbs of boost. This will be in a 70 chevy nova. It will be used for street and some strip use. Any suggestions on what size carbs to use? Also, is there a formula for carb sizing with forced induction? Thanks!!

I would try two 650 Demon carbs for blown applications.

i've got edelbrock 750's on mine, its similar to your motor and they work fine right outta the box.

Originally posted by dizzle
i've got edelbrock 750's on mine, its similar to your motor and they work fine right outta the box.

yes did two 454 likes this right out of the box

750's sound like the winning application then! I kinda like the 750 demon blower carbs. Any experience with demon carbs? being that they lean more toward racing? This engine will get plenty of street time too! Thanks