engine is a 454 bored .030, forged pistons & crank, edelbrock performer 2.0 intake, holly 4bbl, hydraulic lifters, large oval port heads, cmi headers with wet tailpipes. I have 2 cams I can use. one is a crane, lift- 529 intake, 525 exhaust, duration- 278 intake, 290 exhaust. The other is an UltraDyne lift - 586 intake, 600 exhaust, duration- 276 intake, 284 exhaust. Which cam would be better. If I have to go to dry tailpipes that's not a problem.

I would go with the first cam only because of the small intake . It would work better, also no need for dry exhaust

You'll need pretty high comp and dry exhaust, and be able to rev pretty high with that long duration.

contact RMBUILDER on the board here and he can cut you one perfect.

bet those duration #'s are "advertised" not @.050, therefore,
they are actually rather tame cams. I'd change the intake,
and run the Ultradyne! very agressive acceleration rates,
never ran an Ultradyne that didn't make me happy!

What are you running for comp.? I used a very similar set up with a 454 std. bore and used the 502/465 hp cam and made 485 hp on the dyno. That was with the dart oval ports and 9.5 to 1 comp. As mentioned I would check with Bob. He will come up with a grind that fits all your specific components. What ever you do be sure and set up the rest of the valvetrain to match the cam of your choice.

Right on the button!

Harold Brookshire is the camshaft Wizard!
Not many know that old school Hp Harold Brookshire is the best in the world for a fast high performance cam UltraDyne now Bullet Racing Cams They still run all his grids and Tim Goolsby @ Bullet Racing Cams knows is cams too.

I din't think of that.

CN24

Due diligence is in order here, prior to your final selection. A cursory examination of the data will provide you with real information to better assist you in choosing the camshaft that will provide the desired performance levels and behavior on the water, where it counts.

The most significant difference between the two camshafts is the follower. The Ultradyne F-9 intake/F-8 exhaust (since recycled by Lunati as the 402A3LUN) is a solid flat tappet. The Crane Powermax 133802 is a hydraulic flat tappet. The comparison between the two is skewed by the differences in the measurement of the lobes.

UD solid flat cam measures as follows:
Advertised Duration@ .020”: 276Ί/284Ί

Duration @ .050 :……………….. 243Ί/251Ί

Gross Lift valve:………...…………586”/.600”

Net lift after lash…………………..560”/.570”

LSA………………………….110Ί

ICL…………………………..104Ί



Crane Powermax Hyd_Flat tappet measures:
Advertised Duration@ .004”: 278Ί/290Ί

Duration @ .050 :……………….. 222Ί/234Ί

Lobe Lift……………………………..…3114”/.3089”

Lift Valve:………….…………………..529”/.525”

LSA………………………….114Ί

ICL…………………………..109Ί

Looking at the data, it is apparent these are two very different camshafts. I would recommend you first define your performance goals and parameters, and then decide based upon the data what most closely coincides with those goals.

Bob

Spend the money on the good stuff. Have Bob custom grind you a cam. Then sell the old cams on craigslist for a car guy. I gained 5MPH with one of his cams.