Hey, guys I'm in the market for a cam for my '99 GMC Sierra. Help me decide on a nice cam for my mods. Cam is going into a 5.3 RCSB with the following...

*TNT F1 Nitrous kit
*Built 4l65 w/ 3400 PI converter
*Custom HP-Tunning
*ASP UD Pulley
*LS1 efans
*UPD intake
*MSD wires w/ TR6s
*Thorley headers
*Cutouts
*4.10 gears

I don’t know much about cams, but this is one grind I came up with after searching info in the forums.

XER 222/224 .581 .581 114+ 4º.

What do you guys think? Btw, the truck will be sprayed with a 100 shot every once in a while for a little extra oomph, it will run N/A most of the time.

 

Like I said, I don’t know too much about cams, but this why I came up with this grind...

222/224 Duration: 5.3s seem to work very well with grinds between 220 and 224 degrees of duration. I chose a split design cam because it will help the exhaust fumes to exit the motor when I hit the bottle. I went with just 2º more of exhaust duration since it’s only a small shot plus I’m running LTs and cutouts.

.581 Lift: I chose the XER lobes because of the high lift and aggressive ramp which will help produce more HP and TQ (although I read somewhere that nitroused motors shouldn’t run too high lifts in the exhaust). Can anyone verify this? If so maybe a XER/XE 222/224 .581 .568 114 would be better?

114+4 LSA: This will help to reduce overlap, decrease scavenging, and keeps more nitrous in the cylinder after the intake charge than a narrower lsa cam. The 4º advance will help raise the DCR a few points also.

btw, I don’t know anything about valve events...

What do you guys think? Please school me if I'm wrong. Any suggestions or recommendations appreciated.

 

224/227 .569/.563 114 by thunder racing with a set of 918 spring and some hardened pushrods. You have the stall covered and the trans so this should suit you good.

 

Im not a happy gas guy but i have a buddy that is and he runs this cam. Very nice lope to it and it works great with the happy gas.

 

With that converter and gears, you can go with a good bit more cam than that if you want. I know someone running a 226 226 with a 3000 converter in a 5.3, and its a great combo.

 

Hey thanks for the quick reply guys.

Thats the cam looks similar to the one I posted above, but with a little more duration and less lift. I bet it would work nicely.

I was thinking of getting the Patriot part #8401 (Partiot "Gold" .650" Lift Dual Spring Kit) LINK which includes: Patriot "Gold" Springs, Titanium Retainers, Machined bases, Super 7 Locks, & Viton Rubber Seals for $255.50 (best deal I've found so far), but don't really know which brand springs are best.

 

How high would I rev the engine with that cam or the TR224/227 on a 114? O forgot to post this on the 1st post, but I don't want to spin her over 6600 rpms since I'll be running the stock rod bolts and she is 8 years old.

 

I keep my shift points around 62-6500 with my 223/226. The cam you posted will work fine with what youre planning, I was just stating that with those gears, and that much converter you can go with a bigger cam. Also if your lift is going to stay under .600, I wouldnt worry about dual springs. Im (as well as a lot of others) are using the comp 918's and having good sucess with them.

 

I think the cam you posted is perfect, the only thing I would do is go with a 112lsa for more lope... and there is plenty of people running cams with 112lsa and spraying and they have had no issues.... I really wouldnt go over a 224/224 cam... but thats just me...

 

Hey white1 is that a custom cam? where did you ordered yours from?

I'll look into the 918s. Thanks man.