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#1
07-06-2004, 05:57 PM
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I posted this question previously in the Street section. I decided to post it here in the Race section as well for a few more opinions.
I'm assembling a new engine and I'm wondering how much chain slack is to be expected when installing the timing set. I installed a new Cloyes Tru-Roller set (STD chain) that I purchased a few years back. It has about .125" of slack when applying firm finger pressure on the chain between the two sprockets. I want to use a new Rollmaster 9-keyway timing set on this engine, so I installed the Cloyes set just to see if I need to order a shorter chain with my Rollmaster set. The block (2-bolt 400) may have had the mains line-bored or honed. Since the Rollmaster comes in STD, .004", .006" & .010" shorter I was wondering if a slightly shorter chain (.004") may be the way to go with the amount of slack I'm seeing with the STD chain. Thanks. 
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
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#2
07-06-2004, 05:57 PM
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I posted this question previously in the Street section. I decided to post it here in the Race section as well for a few more opinions.
I'm assembling a new engine and I'm wondering how much chain slack is to be expected when installing the timing set. I installed a new Cloyes Tru-Roller set (STD chain) that I purchased a few years back. It has about .125" of slack when applying firm finger pressure on the chain between the two sprockets. I want to use a new Rollmaster 9-keyway timing set on this engine, so I installed the Cloyes set just to see if I need to order a shorter chain with my Rollmaster set. The block (2-bolt 400) may have had the mains line-bored or honed. Since the Rollmaster comes in STD, .004", .006" & .010" shorter I was wondering if a slightly shorter chain (.004") may be the way to go with the amount of slack I'm seeing with the STD chain. Thanks.
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
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#3
07-06-2004, 06:54 PM
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I think that's too loose.
I like it tight!  I've had some roller chains that were like that. But,I would think the Cloyes was a better product.
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#4
07-06-2004, 07:14 PM
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b-man. An eighth inch slack with a Cloyes is too much! You need a shorter chain. I would suggest calling Rollmaster but long distance to Australia with the time difference might be chancy. How about calling Ken Crocie? He gives tech advise and he's a hell of a nice guy to talk to. Don't know if this is still current, but the last time I talked to him the number was (800) 600-0467.
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Bill 64 GTO, tube chassis w/606" IA tall deck, PG & a pro geared Fab 9". 2750 lbs. 8.2550@164.17-1/4, 5.2901@131.97-1/8, 1.1981-60-ft. 8/10/08 
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#5
07-06-2004, 07:29 PM
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I agree that the slop is too much.
99 out of a hundred or so chains I have installed were a snug fit getting them over the cam snout and they were tight when you wrenched the engine over on BOTH sides. A sloppy chain says you need either a different chain or a different length chain if you have had a line bore job. My opinion. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#6
07-07-2004, 05:28 AM
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I ran into this issue on my 455HO engine as well. The block was align honed and after just a dozen pulls on the engine dyno I disassemble some things to repaint the engine. I was flabbergasted at how loose my brand new Cloyes true roller chain was - over 1/4" slop between the gears. I called Jim Butler and he recommended the Rollmaster -.006" set. Once installed I had virtually NO slack.
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Regards, "455HO" Lloyd 2008 GMC Sierra Denali 2WD Crew, L92 6L80E, Silver w/ Ebony guts, 14.26 @ 98 
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#7
07-08-2004, 06:22 PM
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I sent an email to Jeff Kauffman at KRE and he suggested I go with the -.004" chain set.
I just removed a 455 (never been line-bored) from my car with 30K miles on what was a new STD Cloyes Tru-Roller. It has .250" of slack now, so I didn't want to start out with .125" on my new 400. Thanks for the replies guys. 
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
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#8
07-09-2004, 09:55 AM
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OR.... Buy that slick belt drive from BOP and problem solved! Wish I was close enough on my engine to worry about chain slack. But I wont with the BOP unit. Looks really nice! Besides, how cool is a chain you cant see?
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#9
07-11-2004, 05:57 AM
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You guys are about 15-19 hours behind us [ Australia ], varies with time zones within the countries & daylight saving. In Sydney, it is now 10.55 pm, Sunday night.
I'll bet anyone who fits a roller chain [ any brand ], puts 500 miles on the engine & then checks the chain, will find it loose. Nature of the beast. |
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