NicD

iTrader: (7)

Do you have the actual dyno run files that you could post? Do you have the graph over RPM instead of speed? I guess i could calculate the peaks with a calculator if you could post your rear tire height. Assuming a 29.5" tall tire it looks like peak torque around 4100 rpm and peak HP at 5800 rpm but the graph doesn't go far enough to get a good picture of what happens after that. Heck it may still be going up slightly.

LMSeven

iTrader: (3)

Yes this was on stock tires, 255/70. I should be going to the shop today to drop off a cam, I'll see if I can get an RPM graph (I want one too). I trapped 96mph on motor so it's closer to 300rwhp now.

LMSeven

iTrader: (3)

I got the RPM graph, and accidentally left it at my friends house, I will post it asap.

budhayes3

iTrader: (19)

What are the specs on those cams...I hate having to go on comp's website and looking them up lol.

006rcsb

heres a pdf of a bunch of their cams for these motors
http://www.compcams.com/technical/Ca...07/172-175.pdf

NicD

iTrader: (7)

54-408-11 XR259HR 259/265 advertised 206/212 @ .050 .515/.522 112° LSA
54-412-11 XR265HR 265/271 advertised 212/218 @ .050 .522/.529 114° LSA

The hi-lift version of the 265 that I didn't list above looks to be a disaster for a 5.3L and isn't even that great on a 5.7L-6.0L motor.

Mark Johnson

iTrader: (1)

I have that book, aswell as a couple of others- but there's no mention of the 259 in there. COnsidering that the book covers mostly LS1 on up this is understandable...............

budhayes3

iTrader: (19)

Thanks guys

I should be familiar with that first grind lol

NicD

iTrader: (7)

Please tell me you have a dyno graph.

SynergyV8

iTrader: (1)

It's not quite the same cam. It's close, yes, but not the same one.

The XR259 is more of a truck cam than the XR260, but is not listed in the "truck" section on Comp's web page, which I find interesting.