haole_boySS

iTrader: (1)

Is anyone still having issues or had an issue and fixed it? What were the symptoms and what was the fix?

Thanks

Andy

GrannySShifting

iTrader: (10)

Have you checked the preload?

Hannibal

Preload was checked and rechecked. I think its the springs that came on the AS heads but apparently Jay isnt calling/emailing people back so a specific answer is tough to get. Also - remember hearing some complaints regarding the HS rockers but search button isnt helping me out much.

No one else is running the AS S2 heads and HS rockers combo?

Steve Burger

iTrader: (33)

What issues are you having. I have AS 5.3 heads, HS rockers, and comp R lifters. Works great.

Nasty N8

iTrader: (33)

I have done several setups like that with no issues. What problems are you having?

Nate

haole_boySS

iTrader: (1)

this was the original thread I started.....

https://ls1tech.com/forums/pcm-diagnostics-tuning/207047-why-did-i-make-no-power.html

offaxis

iTrader: (19)

It might be easy just to change over to the stock rockers to see if the rockers are the problem. I dont see you loosing hp from those heads.

GrannySShifting

iTrader: (10)

what was the preload?

Steve Burger

iTrader: (33)

OK after reading your first post on this I would like some additional info.

What Springs?
What lifters?
What length PR?

I had the same issue with mine. Jay set me up with AS 5.3 heads, 977 springs, 7.35 PR, Comp R lifters, and I had stock rockers at the time. Did the tune after the install and made 435 RWHP and 408 TQ but the curve dropped like a rock at 6100. It turned out to be preload on the Comp R lifters. I changed to HS rockers and a .030 SVO shim. Redyno showed 443 RWHP @6500 and the curve was flat as a board to 7K where we ended the test.

HTH

Hannibal

Andy - correct me if I am wrong:

He has stock length PR's - (7.4) - chromolly hardened.
I believe the lifters are OEM replacements not the Comp R's.
Heads milled to clean the deck (nothing significant).

So nothing should have changed the geometry. No shims were used.

I think he is gonna look at a few things this weekend specific to the rockers and preload. Based on where he is power wise (370-380) against where he should be (415+) - if its the rocker/preload issue - solving it should net him a big gain with the snap of the fingers (should preload/geometry be off) that he should be able to tell as soon as he hits the gas.

Figure its worth the hour or so it will take to figure out.

Steve Burger

iTrader: (33)

OK, Jay was using the 977 springs on the 5.3 heads. These required Comp R lifters due to the spring pressure. Just something to check.

Hannibal

Is using Comp R's lifters on his 5.3's standard/required practice? I've never heard that and I know Andy was never informed of that.

Steve Burger

iTrader: (33)

Depends on the springs used.

Hannibal

Unfortunately he has found Jay to be completely uncooperative (these are my words and not his). He's made NUMEROUS phone calls and has sent NUMEROUS emails with specific questions in the attempt of solving this lost power issue and he hasnt gotten anything back from Jay. At this point I think he is trying to move forward on his own by using other resources on the board. He has asked for spring info and hasnt gotten it.

Steve Burger

iTrader: (33)

Sorry to hear that. I got my heads about this time last year. Jay was really big on the 977 springs for most 5.3 heads. I have what was a large cam at the time and that was the reason for the 977 springs.

Did you get the lifters from Jay? When did you get the heads? Are they double springs? What size cam? This may help to figure out what is in there.

Hannibal

Again, Andy might correct me (when he checks in) - but I want to say he got the heads about 4 months ago. Came is the FM11 or 13. 228/230 cam. Alan Futral suggested it to compliment the AS heads. I dont believe he ordered the lifters at the same time - at least not from Jay. They are Comp Cam OEM replacement lifters I believe. As for the springs - I am not sure. He should be checking in here in a little while (off work today). He will answer.

He has another new set of Crane duals I believe that he bought but never installed. They can be used with the stock lifters so I can think we are gonna swap out the spings (eliminate the possibility of the 977/Comp R lifter issue) and then reinstall the rockers and double check preload, etc.

GrannySShifting

iTrader: (10)

977 on a stock lifter not good usually... and those pushrods may be a tad too long, depending on the base circle of the cam. May want to shim the pedastol a bit, but all depends on the preload. Id shoot for 1/2 to turn roughly.

Hannibal

Pushrods length should remain stock on that package. Mine stayed 7.4 per Alan himself with that cam and head specs. Andy has basically the same setup (same cam, same deck on the heads). I too think its a preload issue but definately gonna yank the 977's off and put on the Crane Duals which should be OK with the OEM replaceent lifters.

under_construction

iTrader: (1)

When I got my 5.3's from Jay mid year, the choices were comp 977's for the big cams (G5X2/3 at the time) or 978's for less aggressive lobes. Comp R's reccomended (anfd shim/preload check) for the 977's.

I have 977's, heads milled .030 (supposedly) and G5X3 with 7.35" pushrods. I had to shim a small amount (.020) to get preload in the .010 range cold.

Also had to slightly clearance the rockers for the spring retainers - not quite touching but way too close for my comfort level.

GrannySShifting

iTrader: (10)

99% should stay same, and usually do. Ive seen it not however, so check preload to be sure. Ive seen cams need different pushrods for intake/exhausts lobe. That was part of the problem with Waynes car, J had the wrong pushrod size in it