Quote:
Originally Posted by Railcarmover
Model A engine flows at 160 CFM plus or minus
Single Stromberg 97 or Holley 94 flows at 170 CFM plus or minus
matching flow is where performance is,running 2 97's or 94's is sexy,but double the rated flow of a 'reasonably' stock engine.
Cam lift is where the money is,stock A is .286 measured (with a mic or caliper),IB 340 and C grind .320 measured,measuring isn't the actual design lift,but it does give you an easy reference for swap meet shopping.
Lightening the rotating mass gives quicker response (RPM ramp up) but be sensible,flywheel mass stores kinetic energy,vital to smooth operation..good rule,shave some but not all.
the biggest thing is deciding what you want..a modified flathead banger street engine is different than a racing engine.cooling system requirements are less,lubrication requirements are less,RPM thresholds are lower,not to mention a racing engine has a short shelf life by design and nature.you can build a modified flathead that lives and gives a pleasant seat of the pants power increase if you stick to the script.
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I agree, ...and almost to the point of saying that if someone is strong on wanting a built 'B' engine and due to the inherent valve seat issues, -why not consider installing a Serr Miller or one of Dan's 4-port Cragar heads that were designed for street use?