Thread: What do you guys think of this combo??? 402BBC

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I have a 396 bored to a 408 at the moment. and I am putting up what is all going into the motor. Tell me what you guys think, estimates as to HP, etc..
Thanks.
408 BBC
Forged crank, balanced up to 10,000 RPM's with 2 pounds of weight throwing off . before balance it was 600 pounds!
truck rods, stock length
292 heads, 113 open chamber. Heads have 3 angle valve job, 2.06, 1.72 valves, new guides throughout, blue racer springs (single spring), slightly ported, bowl blended.
KB hyperutectic pistons, 17cc dome
Xtreme Energy XE262H Hydraulic Flat Tappet Cam
Lift: .504/.510"
Duration: 262/270
Duration @ .050 Lift: 218/224
Lobe separation angle: 110
RPM range - 1300-5600
edelbrock performer intake
edelbrock 4 barrel carb, 650 cfm
msd distributor

Headers, with flowmaster 40s
Should run 9:1 c/r
What do you guys think this combo would make approximately.
any suggestions?

anybody??

Originally Posted by facemelter

I have a 396 bored to a 408 at the moment. and I am putting up what is all going into the motor. Tell me what you guys think, estimates as to HP, etc..
Thanks.
408 BBC
Forged crank, balanced up to 10,000 RPM's with 2 pounds of weight throwing off . before balance it was 600 pounds!
truck rods, stock length
292 heads, 113 open chamber. Heads have 3 angle valve job, 2.06, 1.72 valves, new guides throughout, blue racer springs (single spring), slightly ported, bowl blended.
KB hyperutectic pistons, 17cc dome
Xtreme Energy XE262H Hydraulic Flat Tappet Cam
Lift: .504/.510"
Duration: 262/270
Duration @ .050 Lift: 218/224
Lobe separation angle: 110
RPM range - 1300-5600
edelbrock performer intake
edelbrock 4 barrel carb, 650 cfm
msd distributor

Headers, with flowmaster 40s
Should run 9:1 c/r
What do you guys think this combo would make approximately.
any suggestions?

There are some that would say put on a 750 but that is based on 100% V.E.
I.M.O,it looks good.
I think you have a good 335-350 hp.
I would run a 3.55-3.73 gear and a 2,000 -2,200 stall to get it launch a little better.
I use to go to school with a girl named "Facemelter" but I'll bet they called her that for some other reason.

yeah i bet it was for a different reason lol. in my truck I currently have 4.10's in the rear with a detroit locker. next on my list is the suspension work, as well as dropping the BBC in the truck.
i figured, id go with a slightly lower duration cam, get some monster torque going, should be fun

with the info you gave, and i will agree with mr. erikson it is under carbuarated with the 650 carb, so desktopped with the 650 is 425 hp, 445 tq, and with a 750 carb, 440 hp, 451 tq.

In this smallest of the big block Chevys, I'd back off one more step on the cam if it is to be a street driven truck. The dcr and cranking pressure numbers look better with the XE256 cam, 212/218, 0.480"/0.486". Easier on the valve springs too.

Originally Posted by mooneye777

with the info you gave, and i will agree with mr. erikson it is under carbuarated with the 650 carb, so desktopped with the 650 is 425 hp, 445 tq, and with a 750 carb, 440 hp, 451 tq.

i went to holley and put my info in, they ask how many cubes you have, and a bunch of other stuff, brakes, electric, or manual choke, etc. And they reccomened a 650. What do you guys think, maybe a 700???? 750?
The 572 has 620 HP and runs a 850 demon.

hey moon eye, can u run this on desktop dyno??? Or if anybody else has it?
the same info as above but with this cam instead, and run it with the 650 first, and then try the 750 carb. Thanks!

Xtreme Energy XE256H Hydraulic Flat Tappet Camshaft
Operating Range: 1000-5200 RPM
Duration Advertised: 256° Intake / 268° Exhaust
Duration @ .050'' Lift: 212° Intake / 218° Exhaust
Valve Lift w/1.7 Rockers: .480'' Intake / .485'' Exhaust
Lobe Separation Angle: 110°

thanks erikson for your input.