-0.015" Big Block Timing Chain

[MadBill]

Cloyes p.n. 9-134-15 is NLA. Who if anyone makes one? (same chain fits BB Ford and Chrysler)

[Malvn]

Have you looked here http://www.romacusa.com/index.html

[MadBill]

Thanks malvin. Interesting; Rollmaster uses bigger sprockets instead of 'shorter' chains like Cloyes. The site doesn't mention how big they go; I'll drop them a line to ask.
They have a handy 'rule of slack' to determine how much short the c-c is; I'll compare it to my actual measurement tomorrow. One factor I'm pondering but which I've never seen mentioned is the fact that mine is an aluminum block and so at 200° F., the c-c will grow ~0.004" more than an iron one...

[Schurkey]

I thought Cloyes used bigger sprocket(s). Aren't "shorter chains" a myth?

[Geoff2]

What Shurkey said.

[EDC]

I thought Cloyes used bigger sprocket(s). Aren't "shorter chains" a myth?

Correct

[MadBill]

Incorrect. The Cloyes tech line is (479) 646 -1662, ex. 228. Call them yourselves to verify if you like but their catalog lists 9-134 as the standard length BB chain; to be followed by a -5 or -10 for 0.005" or 0.010" closer c-c respectively. When I talked to their tech yesterday he said: "Sorry, we don't make the fifteen thous. short chain anymore."

[EDC]

Incorrect. The Cloyes tech line is (479) 646 -1662, ex. 228. Call them yourselves to verify if you like but their catalog lists 9-134 as the standard length BB chain; to be followed by a -5 or -10 for 0.005" or 0.010" closer c-c respectively. When I talked to their tech yesterday he said: "Sorry, we don't make the fifteen thous. short chain anymore."

My IWIS Rollmaster sets show one replacement chain. Maybe Closes uses various versions but I don't use them...

[pamotorman]

can you adapt a LS timing chain tensioner. also some 4 cylinder engine use chain tensioners

[MadBill]

Incorrect. The Cloyes tech line is (479) 646 -1662, ex. 228. Call them yourselves to verify if you like but their catalog lists 9-134 as the standard length BB chain; to be followed by a -5 or -10 for 0.005" or 0.010" closer c-c respectively. When I talked to their tech yesterday he said: "Sorry, we don't make the fifteen thous. short chain anymore."

My IWIS Rollmaster sets show one replacement chain. Maybe Closes uses various versions but I don't use them...

Yes, Rollmaster makes 'fat' sprockets instead of short chains and claim it's a better approach.

[MadBill]

can you adapt a LS timing chain tensioner. also some 4 cylinder engine use chain tensioners

Great minds... and all that, pamotorman! Years ago when I first started rebuilding the engine I failed to find a 'short' chain, so I adapted a Cavalier tensioner to take up the slack, but now I've got a Cloyes two piece cover for fast cam re-indexing, and it won't clear the tensioner. Ironically, unbeknownst to me, Cloyes was still offering a 0.015" short chain back then..

[cpmotors]

Incorrect. The Cloyes tech line is (479) 646 -1662, ex. 228. Call them yourselves to verify if you like but their catalog lists 9-134 as the standard length BB chain; to be followed by a -5 or -10 for 0.005" or 0.010" closer c-c respectively. When I talked to their tech yesterday he said: "Sorry, we don't make the fifteen thous. short chain anymore."

Not a fan of Cloyes, but may I submit some more food for thought here Bill.
I just counted 33 links in the chains I use. To change the Overall length of that chain by -.015"=.00045" per link. That's 4.5 TEN THOUSANDS of an inch change in center to center distance per link. But we are talking Centerline Distance of the CAM/Crankshaft. Sprockets are measured at the root of the tooth vs pitch diameter like gears. I submit that Cloyes is using the usual tactics about chains when in fact they change the root diameter of the gears themselves vs attempting to making chains that alter the link center distance in Ten Thousands of an inch to loose .015" in Center to Center distance across 5.152".

[pamotorman]

Incorrect. The Cloyes tech line is (479) 646 -1662, ex. 228. Call them yourselves to verify if you like but their catalog lists 9-134 as the standard length BB chain; to be followed by a -5 or -10 for 0.005" or 0.010" closer c-c respectively. When I talked to their tech yesterday he said: "Sorry, we don't make the fifteen thous. short chain anymore."

My IWIS Rollmaster sets show one replacement chain. Maybe Closes uses various versions but I don't use them...

Yes, Rollmaster makes 'fat' sprockets instead of short chains and claim it's a better approach.

it is also a lot cheaper to change the pitch diameter of a sprocket than engineer a new chain .

[ZEOHSIX]

I'm wondering if this is for your aluminum big block build....if it is you should take into consideration the additional growth of an aluminum block vs cast iron as the block is heated.......just saying.....

[MadBill]

I'm wondering if this is for your aluminum big block build....if it is you should take into consideration the additional growth of an aluminum block vs cast iron as the block is heated.......just saying.....

Yes it is, as pondered in my post at the top of the page. I've never seen a print for my factory aluminum block, or any aftermarket ones, but I don't believe the former is changed from the iron version. An aluminum replacement for any iron block would have the same issue. I suspect it is just ignored, like P/V and squish difference for same.