rocker noise help

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Jul 15, 2009 | 07:23 AM

corys86vette

Thread Starter

Heel & Toe

Joined: Feb 2009

Posts: 24

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rocker noise help

hey there guys i just installed a new engine its a 355 with world heads im useing a 533-563 lift cam and thats with the 1.6 rockers on the car the rockers are the stamped steel ones im getting a rocker noise where it sounds like the rockers are loose but there not and the car is running really good im just seeing if this noise is normal or what cuz like i said the engine is running really good just haveing a noise

thanks guys for the help

Jul 15, 2009 | 07:53 AM

WW7

Le Mans Master

Joined: Aug 2007

Posts: 8,735

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From: WV

Im not familiar with the rockers you have but Roller Rockers are known to make noise , some of them a lot of noise, If there not roller rockers they should be no louder then the ones that where stock.If its a new engine with new injectors sometimes certain injectors can produce a very loud ticking that sounds just like lifters ticking , just a thought....WW

Last edited by WW7; Jul 15, 2009 at 07:57 AM.

Jul 15, 2009 | 08:21 AM

AGENT 86

Team Owner

Joined: Jan 2003

Posts: 20,275

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From: Summerland B.C. Canada

Did you check the rocker geometry after putting non stock parts on ??
My 355 with decked block, shaved heads, roller rockers, stainless valves, etc, required pushrods .250" shorter than stock to get the rocker sweep, in the center of valve.
Food for thought

Jul 15, 2009 | 08:44 AM

84camino406

Intermediate

Joined: Apr 2006

Posts: 42

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From: gainesville fl

thats a lot of lift for a stamped rocker. did you get the long slot ones? i personally would pop one off and see if the rocker is hitting the stud on the slot area just to be safe.

Jul 15, 2009 | 12:52 PM

reoch999

Pro

Joined: Apr 2008

Posts: 542

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From: middle of Illinois

With aggressive ramp profiles such as comp cams XE or XFI lobes, combined with 1.6 ratio rockers, I'm told that some valve noise is typical.

Jul 15, 2009 | 02:19 PM

JAKE

Le Mans Master

Joined: Feb 2000

Posts: 9,715

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From: Kempner Texas

The valve train noise issue comes up all the time It's usually a running thread on all of the six or more Forums I visit. Some claim it's the rockers, others say it's the lifters, etc., etc. Differing results are posted based on brand of rockers with some saying Pro Mags are noiser than others. Setting lesser preload can be a factor too.

I suspect the noise is generated by two parts hitting together, perhaps ever-so-slightly. To isolate exactly where, you'd have to start right where the roller of the lifter meets the cam lobe and work your way up all the way to where the valve sets down on the valve seat. Anything in between can be the cause.

A couple of weeks ago I installed Scorpion 1.7/1.65 RRs on a custom ground CompCams HR using their CRC lobes (based on XE profiles) and stock lifters; my son's valvetrain is silent.

Go figure.

Jake

West Point ROCKS!

Jul 25, 2009 | 06:45 PM

mtwoolford

Melting Slicks

Joined: Jan 2009

Posts: 3,482

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From: folsom california

I agree with reply number 4 above with the following caveat: that cam with 1.6 rockers is a HUGE amount of lift.

I'd double check for rocker slot, mounting stud interference.

I'd also check for possible interference between the spring retainer cap and valve stem seal / valve guide.

Could coil bind be a possible issue ?