Nah, Its pay for stage 3 cams but get stage 2 OOPS, JDM "special grind" cams instead.

 

IF the comp cams are really 3lbs heavier than the crowers, thats a moot point. A cam is just like the crank, its rotating mass. The 3lb difference wouldn't even show up on the dyno. Now if it was reciprocating mass like the rods/pistons/pins/rings the 3lbs would make a BIG difference in accelerated horsepower (think throttle response), but not steady state horsepower at a given rpm. Just like if you cut 3lb's off the crank counterweights, the gains would be almost negligable.

Plan on greatly reduced valvetrain life using a cam with .580 lift, that puts some very extreme angles in the system. When the rocker wipes across the valve stem at high lift, it rocks the valve and dramatically increases wear on the valve guides (even bronze), and the heavier spring required to control the valve will wear the cam quicker. Above .550 lift the quides are generally showing wear by 10k miles. Be careful, this isn't like driving a hyundai.

 

 

rscoleman
great post.....I would like to know what Crower was thinking making cams with over .600 lift. The mod motors have valve springs about the size of a ball point pen spring.....

We've already tried the Comps and Crowers back to back......the truck still has the Comps in there and the Crowers are up for sale Dale

 

You are right a three pound difference in rotating weight would not show up on a dyno but throttle response is improved. I still believe that 3lbs removed from rotating engine weight has a greater effect on quarter mile times then removing three lbs of dead weight from the mass of the vehicle. The three pounds of rotating engine mass not only needs to tossed down the quarter mile but also needs to be accelerated as engine RPMs are increased. The gains will be almost insignificant but it is the small details that add up to creating a quick vehicle.

 

 

ttt

 

Only 4 days left.... Thanks to all who have ordered..

 

JDM sells cam/kits? Get the F out

 

Is the life span of the valve train effected? I read in another thread that with lifts at .58 that the valve train could see as few as 10k miles.
I am sure many of these kits will be finding there way to daily driven street trucks. So a greater life span than that would be expected.

 

Last Day..