Well, the boss finally decided to do a cam swap in his daily driver, and after deciding on a new custom grind, we have the results!

First, a little background info. on his truck. It's an '02 Chverolet ECSB 1500 with the 5.3L and many bolt-ons(Arizona Speed & Marine headers with custom exhaust using a Hooker muffler, K&N FIPK, ASP underdrive pulley, and free mods).

The camshaft is a truck version of the popular "Old Man" cam in our custom grind series. Specs: 214/220 .600/.525 115+2 LSA.

The 2 dyno runs compared are from before/after cam swap only!


+40 peak rwhp for a daily driver that sounds like stock!

 

Hot dam. Looks good to me! I hope my numbers turn out good. I havent dynoed yet.

 

that is great numbers. wonder how it would do with the same mods minus the headers.

 

John,

I have a question. I read thru some old posts about cam design and cam discussions and it seems you guys are believers in the reverse split cams. (i can't recall who, but i remember someone from thunder defending reverse splits)

is there any reason yall dont come out with any? I think i recall only one off the shelf reverse split offered from thunder. do you think a reverse split would have worked better for your boss' application?

I'd just like some insight from a vender on reverse splits and why they aren't more popular.

thanks and good numbers

 

That seems like an awful big difference between the intake lift and the exhaust lift. I'd be interested in knowing what kind of valve springs you run with this cam, in order to share the difference in lift. I would think a spring designed to run with a .600 lift cam would have much more spring pressure then one for a .525 lift cam, and that the spring for a .600 lift cam would be too much for .525 on the exhaust side. ???

 

Was that a stock cam to start with?

 

No way that was not a stock cam! youd have to cut the base circle down .100"!!

You cant have too much spring unless your collapsing the lifter.

 

I think he was just wondering if the new cam was dynoed against a stock cam.

 

Take a look at the cam that was installed. The 214 220 numbers are only @ .050 duration. Its obvious from the lift that the intake is a much more aggressive lobe. I'm sure that if you looked at .200 lift that the intake valve would have more duration than the exhaust valve. Wouldn't that make it a reverse split? I'd say so. The problem with this comparison is that these are two different lobe designs, not just two durations of the same lobe.

 

ohhhhh. thanks tex. i didn't think about that

also, would bein that the intake valve being lift off its seat that much more at .050 make it a reverse camshaft? sorta like when intake duration is larger its just holding the valve open longer. am i off?

what kinda spring would you wanna use with that cam?