Thread: torque and hp how much total timming

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1976 suburban 454 20over steel crank stock truck rods flat tops steel nos head gaskets 702 heads extreme energie cam 224-230 at 50 515-520 lift performer rpm intake 3310-1 vac secondaries what kind of hp and torque just broke in on stand sounds real mean running 12 intial how much total should i run no vac advance and is jetting close 72 primary 76 sec

This is just a rough estimate but you should be running around 385- 415 H.p. according to the cam and motor specs that you gave. Total timing around 28-32 degrees being conservative. Around 5500-5800 R.P.M.'s max .

HP and torque are probably close.....I personally would run more timing than that, about 38 to 40 total, and 16 or 18 initial...my big blocks have always run best around there, but as always, check because every engine is different. Why arent you running vacuum advance?? On the street, it's a good thing to have, you'll be much happier with it. Jetting should be close enough to run pretty good. John

thanks guys for the info..... i called summit a few weeks ago and they said 425 hp at 5600 rpm and 16 initial and 36 total jetting is good it should shred the tires on my 56 gmc i think it will be a real nice combo for the street.....