Sewing Machine... 350 SBC XR282HR Comp Cam with Lunati Roller Rockers - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-01-2012, 07:58 PM
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Sewing Machine... 350 SBC XR282HR Comp Cam with Lunati Roller Rockers

Motor has about 300 miles on it and i never really noticed but my engine sounds like a sewing machine. At first i feared it was a ring land, but a compression check showed that all was well.

Cam is a XR282HR, with LS7 lifters and Lunati Voodoo Rockers...
Im running procomp sheet metal valve covers and have plenty of clearance.
Preload is set up 1/2 turn past zero lash.

Is a sewing machine sound normal with an aggressive cam like this?

Its not terribly loud... i can hear it with the hood closed... but I can hear it with the hood open if i listen.

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Old 08-01-2012, 08:04 PM
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That sound is pretty normal with aftermarket roller rockers. I've heard it on every engine I've had with them. My solid roller sounds like that with the hood closed.
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Old 08-01-2012, 08:21 PM
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its not that loud that i can hear it outside... every once in a while if i bring it up to around 2500 rpm I can here it in the cab.

No misses, or carrying on... motor runs like a raped ape and moves my 4000lb pickup pretty good, pretty damn good.
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Old 08-01-2012, 08:25 PM
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As long as you tightened them down right I wouldn't worry about it. If it was super loud then you might need to readjust the preload but otherwise you'll be good. I've ran hydraulics a few times with aftermarket roller rockers, including a set of LS7 lifters, and they made that noise. I think you're good man.
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Old 08-01-2012, 08:58 PM
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thanks, ill try not to worry about it...
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Old 08-01-2012, 09:29 PM
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try a different oil and or viscosity
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Old 08-01-2012, 11:07 PM
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Quote:
Originally Posted by ap72 View Post
try a different oil and or viscosity
This made a noticeable difference on my motor with a XE Hyd cam.
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