Cam will be 224/228 580 lift on a 114 lobe sep.. 58k miles. Do I need new rocker arms? New lifters? Looking at 1 7/8 inch long tubes instead of 1-3/4 inch how will that effect my bottom end torque... Noticeable or neglegible? I hate to give up any low end torque Thanks..

 

new rocker arms - no

new lifters - you don't need them, some people add them for insurance but they require removing the heads. Lots of people run cams without replacing them and dont have issues.

bigger headers - thats debatable but I don't think you really need them since its a smaller cam.

 

Thanks for the input nullpointer.. I agree , just wanted some other opinions

 

That cam is still good for lower mid to lower high but not top end power. I have very similar around 5800 rpm's where it loses steam.

 

Looking at your profile, you have a serious set up with a 6.0 Forced induction system.. From the dyno sheets I have seen with this cam and Headers, it looks like it has plenty of power up to 6500 rpm.. Peak is around 6100 rpm Thats naturally aspirated of course..

 

Personally, I would do the trunnion upgrade while the rockers are off the car. Not a lot of money, tightens them up a bit and no issues going forward with loss needle concerns. If you are FI, not sure what springs you plan on using, but I would shim to get a bit more seat force. Need to figure that out by the particular spring though.

 

Ya i guess these are two different animals. Just trying to help.

 

David, I'm going to be going through a similar upgrade to my engine very soon. The cam I selected is slightly bigger than yours (230/236 & .591/.601 114+4) but I'll also be doing a lot more than you (new PP 243 heads, dual springs, FAST intake, LS2 TB, etc). I'll be going with 1 3/4 headers with mine and while the 1 7/8 headers would be ok, I don't think you'll see any noticeable HP increase. It might be better for later on if you do other mods. I researched the 1 3/4 vs 1 7/8 a lot and found that as a general rule, unless you're pushing 500+ rwhp, the 1 3/4 will be more than adequate. I was fortunate to find a new set of the XS Power headers w/X-pipe and HF cats from one of the forum vendors. If you can find the 1 7/8 headers for a price close to the 1 3/4, then why not? But if they're much higher in price, I'd stay with the 1 3/4 headers and save that $$ for other mods.

As stated earlier, I don't think you need to replace the rockers at all. Lifters? If you pull the heads, then yes, replace them and the lifter trays. But as stated, you'll probably be just fine. The trunion upgrade is inexpensive and a worthwhile upgrade to the valve train system. BTW, have you done any baseline test to see what output you have with your current setup? It would be nice to see where you're at before you begin so that you can see how much help you new mods are. With cam and headers plus a good tune, you might see 75+HP.... that would be quite nice. Let us know how it turns out.

 

Thanks for the info Cactus cat. 375rwhp with a dyno tune and CAI.. I'm hoping for 420ish with the cam and headers.. I am more concerned about losing bottom end torque than I am some big number on the top end.. That why I chose that cam.

 

Nice numbers with the tune and CAI. I'm very stock at the moment with CAI and some Flowmaster catbacks. Probably just barely over 300rwhp. But my mods should put me in the 450ish range rwhp. I would suspect you'll be over your 420 number, maybe 440 or so. I think an extra 65hp with that cam and header is obtainable with proper tuning. Good luck and keep us informed. Love to hear and read about other ppl's mods.