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Discussion Starter #1
Cam in question #
721602-08 CL721602-08 288 288 260 260 .616 .616 108 104 .018 .018 1,6,15,34

CL721602-08DL4 3400-7200 Rough idle, Hot Street/Strip, good mid range power. 10.5:1+ CR, 3500+ stall & headers

This is to go in my 440ci big block mopar , 10.75ish :1
Car is 3660lbs with me .Car is a daily driver that I bracket race .
Replacing a [email protected] . 540 gross lift 108/108 solid ft
looking for a bit more mid and top end

Tex
 

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That may not make peak HP as high as your current cam. Without all the specs, I'm not sure, but since your current cam is only 2 degrees smaller at .050", and .076" less lift, it's likely to be bigger at the seat then 288. If so, you'd be going with less total duration, and that would lower the peak torque RPM and peak HP RPM.
 

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Discussion Starter #3 (Edited)
thanks Mike
yes advertised duration on current cam is 293
are you saying keep the higher advertised duration to maintain higher peak hp/rpm
I always thought with a smaller advertised but similar or higher 050 numbers it meant a faster ramp rate - is this incorrect
thanks for your input
would this be better though with a 108 separation 104 intake centreline
Advertised Duration (Int/Exh): 288/296
Duration @ .050 (Int/Exh): 259/267
Gross Valve Lift (Int/Exh): .586/.606



Tex
 

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I always thought with a smaller advertised but similar or higher 050 numbers it meant a faster ramp rate - is this incorrect
That is correct, but it's the seat duration that dictates where peak HP occurs. IF you want to move peak HP up in the RPM band, you will need more seat duration then your current cam.
 

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Discussion Starter #8
thanks for the replies
thanks Mike for the explanation .
As I am looking to take advantage of head flow , CNC ported Stealth heads , but not really pull a lot more rpm it looks like a custom cam but necessarily a few more degrees at 050 to retain the advertised duration I have , I certainly do not want to lower where peak HP is . As it appears most more modern grinds are shorter advertised but more lift .
Or try 1.6 ratio rockers ?

Tex
 

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if you check the true rocker ratio on what you have you may be surprised. all of the bb mopar adjustable rockers i've played with that were rated at 1.5 checked to a true 1.6 and 1.6's were 1.65. changing rockers may not get you much more than a thinner wallet. i think to really make a rocker difference you may have to find 1.7's.
 

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Discussion Starter #10
Lew ,
thanks for that guide/information . I do have Crane Golds
Looks like a cam is the only true choice for gain

Tex
 
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