Thinking about doing a cam swap. Currently I have the comp. .212/.218 .521/.528
I'm thinking about stepping up to the comp. .216/.220 .525/.532
I wanna keep the same shift points, just make more top end. What do you think?

 

If you add lots more duration, you'll need to move your shift points up. You can probably addsome duration, but more lift to acomplish your goals. Maybe a single pattern comp XE high lift 216/216 .559 115lsa +3.

 

not sure about my piston to valve clearance. I shaved .020 on the heads and don't know how much lift it can take.

 

.020 shouldn't be any big deal at all. .560 lift and that small duration won't come close. .600+ lift with big duration and milled heads would need to be watched, but not your setup.

If you change cams,you are giving up HP by not going with the high lift cam.

 

so you think i should go for more lift than duration and come out better?

 

maybe the high lift 212/218 version and knock down the lsa to 114?

 

By increasing your duration, you start moving up rour powerband in rpms. If you want to keep the same shift points, don't raise the duration a whole lot. Lift gets the valves open higher for more air flow, but not open any longer. So more lift is like free power at the same rpm level. But increased lift is harder on the valvetrain, but with your 918 springs, .550-.560 lift is no problem.

If you want to make more power, and don't mind moving up your shifts just a little more, then get something like a 216/220 high lift. If you have a good exhaust, you could cut back the exhaust duration and add intake duration for a single pattern 218 high lift cam.

 

I have the cam you are speaking of in my 4.8 and I love it. The power feels great all through the power band and it pulls forever. I think it's a great cam and I have no real complaints from the change. I need to work out a few little bugs with my idle. It seems to surge a little with A/C on or when it's cold outside. Allen has been working on it with me and I'm sure we'll get it all worked out here pretty soon. Other than that I need to do all the little things to my tranny and add on a set of TOG's or ASM's. Later I want to go to a 5.3 or 6.0 so I would love to know how well this cam performs in your 5.3. Keep me informed on your choice.

 

That's the cam I'm using too. I have those same idle issues, which I'm sure are magnified by the blower and my superior inability to tune worth a damn. This came pulls like a raped ape on my blown 5.3. It really starts comnig alive in 2nd and 3rd gear above 4500 rpm.

I have no idea how it runs off the line ... all I can do there is . I would bet it would nail you pretty hard though if I could hook up.

 

Them cam wil work fine but I would go with something with a bit more lift if I were to do it again. I lost quite a bit bottum end with it but since then have added a stall and gears. I have over 35k miles on this cam and the only issues I have is tuning ones. This cam needs a good tune for sure to get the gains it is designed for. IT isnt a monster by any means but big enough to need a tune