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Old 03-09-2019, 04:22 PM
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HP estimate s.w.a.g.

I've been subscribed for a while and really value the information I see. I wonder if one of you guys with engine building experience can give me a HP estimate on my SBC.
355 with flattop cast w/4 valve reliefs, Sportsman II 64cc heads, 214/224 dur. & 443/465 lift, full roller rockers, Performer RPM intake, 600cfm Edelbrock carb, Malory Unilite dist. (Mech advance). I've got 2" ramshorns on it now but looking for long tube headers.
This is in a 67 chevy II post car, running 1.8 Powerglide and 3.73 gears.
Car runs great but have always wondered about the HP.

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Old 03-09-2019, 04:59 PM
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I'd say you are likely in the 320-340 Hp level. Long tube headers would probably bump that 12-15 Hp, but their biggest gain would be low to midrange torque, boosting that probably 25 ft'lbs.
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Old 03-09-2019, 05:04 PM
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My guess would be about 400 HP at 5,000 RPM the flywheel with a good tune.
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Old 03-09-2019, 05:18 PM
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I was hoping it would be at least 350 hp with headers. The improved low to mid range would be perfect. Not a high winder. Built it as a 1,500 to 5,500 motor for criusing but do shift the Glyde at 6,000 sometimes. I forgot I do have a 2,400 Hughes converter.
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