Cam choice

[jeff dunn]

64 c10 355 sbc, what cam your you guys running to get these heavy trucks rolling.
One I have doesn't seem ton work very well.
355 sbc
215 / 64cc alum heads
Isky 530/550
232/246. 282/292 @.050
110 lobe center

Also I have a 750 demon, was told these were much bigger than a 750 Holley, this may be my problem
Any input would be great. Jeff

[61 apache 10]

Originally Posted by jeff dunn

64 c10 355 sbc, what cam your you guys running to get these heavy trucks rolling.
One I have doesn't seem ton work very well.
355 sbc
215 / 64cc alum heads
Isky 530/550
232/246. 282/292 @.050
110 lobe center

Also I have a 750 demon, was told these were much bigger than a 750 Holley, this may be my problem
Any input would be great. Jeff

That cam should sound pretty nice but your gonna need a 2800-3000rpm convertor and a set of 3.73:1 gears to be able to leave the line.

[imjeff]

What tranny, rear gear and tire size you running?

[jeff dunn]

350 trams
373 gear
28.5 tall tires
2500 to 2600 stall

Hoping its the carb

[buds56]

I think you have too much cam for your converter and gears.

That's a 3000-7000 power range cam

With those tall tires I would go with a milder cam or drop to 4.11 or 4.33 and move to a 3000 converter, that's a fair amount of weight your trying to move.

There's a lot of other variables such as ignition, timing, carb, exhaust

JMO

Good luck,Bud

[jeff dunn]

bud 56 , you are correct on cam,
Im gonna try a diff carb, have not had much good feed back on the demon carb, ive always run quads or holleys, was told a 750 demon flowed more like a 850 , maybe it to much, hate to tear a motor apart for a carb fix, thanks

[endlessearth]

I have a 355 in my 1964. Xtreme Comp Cams 286 duration and about 485 lift. Was running a 750 Edelbrock carb originally but it was too much and switched to a 650. Stock heads from the 283 that came out of the truck. 2.5" headers and exhaust. 5-speed manual tranny with 3.73 gears. Sounds good. Runs good. Launches like a bat out of hell.

[IMG][/IMG]

[geezer#99]

Originally Posted by jeff dunn

bud 56 , you are correct on cam,
Im gonna try a diff carb, have not had much good feed back on the demon carb, ive always run quads or holleys, was told a 750 demon flowed more like a 850 , maybe it to much, hate to tear a motor apart for a carb fix, thanks

Before you waste your time changing the carb, what is your timing curve like?
What's initial?
How much in the mechanical?
Vac advance, how much and which port?

[jeff dunn]

12 to 14, no vacum, total is 36 to 38, vacum was pulling it to 58

[geezer#99]

So you got 24 in your dizzy. And likely a lazy curve.
You need 16 to 18 initial.
Limit your dizzy to 16.
Limit your vac advance to 12.
That'll wake it up.
http://www.crankshaftcoalition.com/w...EI_distributor

[Captainfab]

The other thing that is hurting your engine's low end torque output is those heads. A head with 215cc intake ports is way too big for a streetable 355.