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Old 10-17-2012, 08:13 PM
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sbc 406 hp torque?

im building a 406 sbc with 1997 vortec heads 092 casting they have been ported and polished on a bench flow they have 202 160 valves screw in studes guide plates 64 cc combustion chambers. it will have 9.8.1 compression, edelbrock rpm air gap intake 600 cfm edelbrock performer carb accel builit distributer hedman headers flowmaster exhaust. i have heard of a similair setup but with stock vortec heads produced 425hp 525 ft lb of torque is this possible or more hp and torque withe this setup
any ideas would help thank you.

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Old 10-17-2012, 09:19 PM
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yes,you will make decent hp.use a 750 cfm carb
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Old 10-18-2012, 04:37 AM
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sbc 406 hp torque?

What type camshaft do you plan on using? Without the specs. cannot determine horse power or torque. Has the rotating assembly been balanced?
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Old 10-18-2012, 06:06 AM
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Quote:
Originally Posted by vinniekq2 View Post
yes,you will make decent hp.use a 750 cfm carb
depending on usage, I'd lean toward a 750 vac 2nd carb..
unless you're running a lot of strip runs on or off the track. the vac 2nd carb most times works better overall..
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Old 10-18-2012, 06:39 AM
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Quote:
Originally Posted by matt406 View Post
im building a 406 sbc with 1997 vortec heads 092 casting they have been ported and polished on a bench flow they have 202 160 valves screw in studes guide plates 64 cc combustion chambers. it will have 9.8.1 compression, edelbrock rpm air gap intake 600 cfm edelbrock performer carb accel builit distributer hedman headers flowmaster exhaust. i have heard of a similair setup but with stock vortec heads produced 425hp 525 ft lb of torque is this possible or more hp and torque withe this setup
any ideas would help thank you.
As said, the cam specs are needed to make any guess as to power output. But the Chevy 400 will make good power given a good combination of parts; 425 HP is easily attainable. 525 ft/lbs torque can be done as well. Take a look at the the graph under Test 1 (Vortec Heads) in the article High Performance Chevy Small Block Engine - Engine Masters Magazine.

A larger carb like the 3010 Holley 750 vacuum secondary would be a better choice for a performance build of a 400 SBC used on the street. And I personally prefer the RPM intake w/o the air gap if the vehicle will be driven on the street. Doubly so if it will be driven in cold weather.

Tuning the advance curve is very important. Most distributors need help w/this.

FM mufflers have been shown to be more about sound than performance. You should look into this, check them against other performance mufflers like the Dynomax.

BTW, the L31 5.7L Vortec casting numbers are 12559062 and 10239906.

Good luck.

Last edited by cobalt327; 10-18-2012 at 06:51 AM.
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Old 10-18-2012, 08:46 AM
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Get a 750 to 800cfm carb The 600 is too small.
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Old 10-18-2012, 08:33 PM
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its going in a 1979 gmc high siera heavy duty 3/4 ton truck detroit locker 456 gears 1999 4l60e tranny with a tci controller. cam specs are 465/485 lift 280/290 duration 106 lobe centerline setup at 102 lobe center line advanced 4 degrees on the crank shaft. tranny has a 2400 stall.
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Old 10-18-2012, 09:55 PM
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its going in a 1979 gmc high siera heavy duty 3/4 ton truck detroit locker 456 gears 1999 4l60e tranny with a tci controller. cam specs are 465/485 lift 280/290 duration 106 lobe centerline setup at 102 lobe center line advanced 4 degrees on the crank shaft. tranny has a 2400 stall.
Why a cam on a 106 vs. say a 112?
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Old 10-18-2012, 09:59 PM
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truck with tall tires,advance the cam to close intake valve earlier,thats my guess
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Old 10-19-2012, 08:33 PM
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thats what the engine builder had the cam ground for my setup. i guess more off idle torque.
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