sewing machine top end sounds

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Jul 28, 2004 | 12:19 PM

mattz06

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sewing machine top end sounds

I have the NASTY sounding sewing machine sound now that I got my motor back together

stock rockers arms
7.4 pushrods
unmilled patriot 6.0 ls6 style heads
comp 850-16 lifters (preload like stock)
decked shortblock (not decked much)
g5x2 cam (smaller base circle than stock)

damn I hate this shitty sound. it gets loud.

I did use a pushrod length checker, it was **** so I just used 7.4's.

whats the fix? correct lifter preload/ pushrod length acheived with adjustable rocker arms like the new comps or jesel mohawks?

Jul 28, 2004 | 12:21 PM

HumpinSS

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From: Waldorf, MD

I thought with smaller base circles and uncut heads you had to run a longerthan stock pushrod to take up the slack?

Jul 28, 2004 | 12:23 PM

mattz06

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yes it does, a stock pushrod is only 7.380, the base circle being around .020 smaller on the g5x2 puts it right at 7.4

Jul 28, 2004 | 02:11 PM

LEATHL_WS6

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The valvetrain is noisy with a bigger cam. Not much you can do. A set of HS roller rockers will quiet it down some.

Jul 28, 2004 | 02:16 PM

Damage Inc.

Sweet Cheeks

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Are those HS rockers superior to Yella Terras. I'd like to quiet it down a bit too. Not to mention a smoother and less dragged valvetrain.

Jul 28, 2004 | 02:17 PM

gomer

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The fast ramp rates of the cam, larger intake and exhaust valves, and stiffer springs will cause the noise you are talking about.... not much can be done about it.

Jul 28, 2004 | 02:41 PM

LEATHL_WS6

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I like my HS's they work great no float. I have heard tales of Valve float issues with the YT but I have no experience there. Maybe some one else can give you more factual info.

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Jul 28, 2004 | 03:01 PM

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Sweet Cheeks

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I know the YTs are about $500, but how much are the HSs?

Jul 28, 2004 | 03:09 PM

#10

Neumonic2002

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From: STL, MO

What are HS rocker arms?(must be having a brain fart)

Jul 28, 2004 | 03:11 PM

#11

tensecondz

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Quote:

Originally Posted by Neumonic2002

What are HS rocker arms?(must be having a brain fart)

Harland Sharp (brand name)

Jul 28, 2004 | 04:04 PM

#12

93Polo

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Quote:

Originally Posted by gomer

I have ran the YT's on my car without a problem. They have never caused me any valvefloat issues. If I was buying again.. I'd probably buy the HS ones due to their better price.

My YT's are wroking great