Orange Peel

iTrader: (20)

I got the car all done tonight and I started it up and it makes a LOT of noise, a knocking noise around the intake area. I checked the lifter preload to the best of my knowledge, it seemed the 7.35 pushrods that I put in were too short, so I took them out and put the 7.4's in, restarted it and it still made the noise. Maybe I am not checking it right, maybe I need a shorter pushrod than the 7.35, what do you think it could be? The car idles fine, revs fine, but just knocks LIKE HELL!!! I'm bummed!

Here's a list of what the car has on it now....

PRC Stage 3 5.3l heads with 2.055/1.60 valves, not milled, just a deck clean
Cometic .040 gaskets
Comp OE 850 lifters
7.35 pushrods/7.4 pushrods in now
Custom Ed Curtis cam 236/240 .630/.608 on 113lsa (he said it would clear without flycutting, I told him what I had and wanted)
LS6 intake
QTP 1 7/8's headers


ANY idea what I should try next, I don't feel like taking the heads off, I don't think it's hitting (PTV), when I took the 7.35 pushrods out none were bent or anything.

It's just weird how it idles great and revs FAST! Just SOOOOO ******* loud!!! Please help!

Haans249

iTrader: (24)

It is very possible that you're getting a collision with the valves/pistons. I'm looking for a cam with my heads that have 2.055/1.57 valves and for what I've found out thus far, the largest cam i can go with is no where near the size that you're running and you're even worse off because you have less clearance with the 5.3l heads. I would highly recommend that you take a head off and see what the valves/pistons look like....HIGHLY RECOMMEND, before you do anymore reving/starting of the engine. It would be a world of **** if this is happening... Best of luck to you!! Let me know if it has fit, or if something bad is going down in there.

Peace,
Adrian

SUX2BU

iTrader: (14)

JESUS CHRIST! a .630 cam won't even clear stock heads with stock valves! you have begger valves, the heads have been milled AND your using a thin head gasket. All your intake valves are probably bent my now so pull the heads off.
The pushrods are not bent cause they are hardened pushrods. they are harder than the valves, so the valves are the ones that are bent.

RPO_Z06

iTrader: (11)

I see no way that should clear without flycutting, did you check you PV clearance ?

35th SS

iTrader: (2)

if I was you I would pull one of the heads off.

2000blackta

iTrader: (16)

I just ordered the new AFR 225 small bore heads milled to 63cc. When I ordered them, he told me to be ABSOLUTELY certain that I fly cut the pistons because they wouldn't clear with the lift on my cam (.598). I'd be a little pissed at the guy you ordered it from if he told you you wouldn't need to fly cut with a cam with that much lift.

dudas35

iTrader: (4)

I don't believe i have ever seen anyone run a cam that big on 5.3 heads. You are going to need to pull the heads.

SideStep

GuitsBoy

iTrader: (4)

yes, as ALL the others have said, youve probably got 8 bent intake valves. Sorry man, I dont know what Ed was thinking but thats a monsterous cam to run even on stock heads and stock sized gasket.

Mike@TEA

You probably do have bent valves. We do not recommend anything larger than .228 @.050 with our 5.3 head with a 2.02 valve. One thing to be aware of which Ed may not is the 5.3 valve seat is about .030 closer to the deck of the head than a 5.7 which automaticllay gives you .030 less clearance before any milling. You will have to pull the heads replace your intake valves and flycut your pistons.

777

iTrader: (21)

HMM...you've got a decent sized problem. All of your pistons are going to be banged up, plus the valves. I wouldn't run it anymore and risk a valve breaking and you needing a new engine.

PREDATOR-Z

Just another victim of "dot to dot", I do not degree my cam.
Sorry, but what can I say, it is not ED's fault.

SLowETz

iTrader: (12)

Are you SURE it's idleing great and revving fast?
If so... somthin's up.

Everytime I've done a cam swap I'll get the lifter/valve noise until it builds full oil pressure that's loud and "can" sound like knock(even when spinning the motor w/out fuel/spark to build pressure). How long did you run the motor?

Agree w/the above posts..... unless you got a much smaller cam than ordered....or the flycut fairy made a visit you've got some trashed parts in your motor.

Pull a head and have a look.....

SLowETz

iTrader: (12)

Good catch Pred.... hadn't thought of that. May have it off a tooth .... and unless you check it to see where the events fall, yer just trying to hit the hole it the dark.... so to speak. Sometimes it feels good..... sometimes it hurts-

1Bad RamAir

Agree with everyone else and the damage is already done to the valves and may have scored the piston. Its a bead deal but your gonna have to pull the heads. Post some pictures when they are off. Like everyone has said do not run the car anymore!!!!!!!

Goodluck!

Turo

iTrader: (23)

I was thinking the same thing. I really can't see ED making a mistake like that. Who knows though....

777

iTrader: (21)

Well, I sent him a PM just to make certain.

Orange Peel

iTrader: (20)

Well I have ALL my emails telling him I had the above parts listed, I DID NOT WANT to flycut, and I asked if I can dot to dot, and he said with a good timing set which I have. I turned it over SEVERAL times by hand and heard nothing, felt nothing, so I took his word. I don't know how to degree cams in, I KNOW it was dot to dot, I checked it a million times, this is my 3rd cam swap, no issues before.

I will pull a head and see what it looks like, definitely sucks. He said he has done a bigger cam than this and it cleared fine.

And I'm POSITIVE it idles PERFECT and reved EXCELLENT, just makes noise, it didn't stall, backfire, stumble, NOTHING, even on decel off the rev, just knocks.

Orange Peel

iTrader: (20)

........

777

iTrader: (21)

Maybe something's wrong that has nothing to do with the cam. How's your oil pressure?