CAM question for my motor.

[sverbus]

I'm currently running this cam:

Comp Cam Solid Roller
.642int/.670exh Lift
263int/270exh Duration @.050
104 installed centerline
108 lobe sep.
4000-7200 rpm range cam

-The motor it's in is a 434 Stroker motor. 12.5:1 compression.
-Dart Block, JE Flat-top pistons with H-beam Eagle Rods
-Dart Pro-1 230cc heads ported and polished with bowl work done to match all 8 bowls. 2.08int/1.60exh valve, Manley Severe duty valves.
-Harland Sharp 1.6 roller rockers with guide plates and stud girdles.
-Dart Intake port matched to Felpro 1206 gasket as well as the head intake runners are ported to smooth and match that same 1206.
-820 Race Demon with Annular Boosters
-Mallory HyFire 6 Digital Ignition
-1 5/8 Hooker SuperComp Headers with 3" exhaust and Dynamax Bullet mufflers.
-Powerglide Transmission with full competition manual valve body
-Ford 9" with 4.56 gears and 28" tall tire

My question is that I'm kinda torn as to what cam to move to. I know that this cam is not enough for this motor. Especially all the work the heads have done. The cam that Cam Motion and Comp Cams are suggesting is as follows:

Solid Roller
273int/280exh duration @.050
.706int/.688exh lift
109 lobe seperation
105 Centerline
4000-7400 max rpm

I'm not worried about the valve train on this car, I think it's beefy enough to sustain this cam, and I do drive the car on the street, but I'm not worried about streetability because we dont plan on going that far with it. That's what they make trailers for.

I know alot of you guys have some serious motors and experience so I'm asking your opinions and thoughts on this cam. I made 472 rwhp last year on a dyno with fuel problems and ignition problems because of not doing my homework on how to properly hook stuff up for maximum performance. So I know that we can make alot more.

Thanks guys and gals, take care and be safe!

Scott

[DriveWFO]

I'm running a custom hydraulic tappet grind from CamMotion and have been very pleased with their recommendations. Did you talk to Danny?

[John_Heard]

What kind of compression does it have with those flat tops? I'd be a bit concerned about increasing the duration more. What kind of cranking compression does it have now with the current cam? The additional lift would be good.

[sverbus]

Not sure about the cranking compression...The motor is out of the car and sitting on the floor. Would I get an accurate reading if I were to put a compression tester on the one sparkplug and crank it one full revolution by hand with a wrench on the crank shaft?

And that cam I'm thinking of going to is from Danny at Cam Motion. He said we can keep the lift the same, and possibly go with 10 numerical less on the duration. I do know that the pistons come out of the deck about 4 thousandths, so I'm hoping that I have valve to piston clearence.

Thanks fellas,

Scott

[DRAG GTA]

Would I get an accurate reading if I were to put a compression tester on the one sparkplug and crank it one full revolution by hand with a wrench on the crank shaft?
Scott

No. Sorry I can't help ya w/ the choice on a cam. But cranking by won't generat the same effect.

[sverbus]

Ok, I didn't think it would but was worth an ask :) I'm actually going to settle on this and run a cam in the high 260-270 range on duration because I'm planning on footbraking the car and I'm going to go to a 672 across the board on lift so that I don't beat my valve train up to badly while driving on the street.

thanks guys,

Scott