I do not want to replace the stock cam, however I am looking for valve train reliability and 6000 rpm compatibility with a basically stock 2001 LS1, except for SLP lid, PCM tune, and 3.42 gears in an A4 Z-28 and cut outs after the stock cast iron exhaust manifolds. i don't want the hassle of long tube headers.

My question is:
Will SLP 1.85 rocker arms with LS6 valve springs and hardened push-rods be of any significant benefit. The engine currently revs to 6000 rpm but I'm afraid I will floats valves with 70K original miles on current valve train.

 

Do the LS6 springs. Pushrods are optional. You should have no valve float issues with the stock valvetrain and LS6 springs, even well past 6000rpm.

Aftermarket rockers are known for causing valve control issues. They're expensive and offer little performance gain. Don't bother. I you want some peace of mind upgrade the stock rockers with Comp Cams rocker trunion upgrade.

I don't understand what the hassle is with longtube headers. They increase power, the engine sounds better, and spark plug access is much better. Ground clearance doesn't suffer a bit.

 

Also with the stock cam there isn't much point in pushing it over 6k anyways...

 

Response to long tube headers:

I am re-considering the long tube headers for a future modification. I assume the increase in torque and HP is perhaps the best cost effective modification with the least amount of hassles.

Question on 1.85 rocker arm ration:

The SLP website shows the 1.85 ratio rockers increase in valve lift of approximately .025 inches to .505 intake and .521 exhaust. Stock rockers are 1.7 ratio. SLP claims gains up to 12 HP. Price is approximately 40-50% of header installation with exhaust modifications. Is this a reasonable expectation with a stock cam?

 

Only partially related. I make 381/373 with a GM Hotcam on stock heads. I have always wondered what a set of stock 243's and 1.85 rockers with appropriate valve springs would be capable of. I have never been curious enough to invest the money, just theoretical.