Dansic

Has anyone used a .005 under timing chain on an LS engine that has NOT been line honed to take out the slop? Every LS engine I have with new chains still has some slack after assembly. I remember someone talking about it, but I cant find the thread. Dont tell me slack is normal either, all my big blocks are tight and so are the older small blocks. 5* of slack is bad.

G Atsma

The bit of slack is there for when the engine grows as it warms up. You WANT a little slack when cold.

Dansic

i can push one side of the chain 3/4" to the side away from the guide. Thats too much

G Atsma

BBC and SBC are iron and don't grow as much as aluminum.

Dansic

they expand .015. I know i set my lifter preload with that in mind. Doesnt mean this chain is correct.

G Atsma

How old is the chain in question? If new, it could be defective. If not, it has stretched.

Dansic

New. Tried summit brand and C5R. Both have the same excessive slack.

G Atsma

Then it sounds like the block might be out of spec, unless you had a good chain in it that fit right.

Dansic

One i took out was worse

Ls1Rx-7

iTrader: (4)

The Katech timing chain is pretty tight and all their products are quality

grinder11

iTrader: (1)

For someone to manufacture a chain that's .005" shorter, it would be almost impossible. I mean, each link would have to be like 1/10,000" (100 millionths of an inch!) shorter than std. Is the chain pre-stretched? Either that, or your block has an issue, or the slack you're seeing is normal. Both are impossible to diagnose from here. It would be nearly impossible to have every chain you're trying be out of spec..........

Dansic

i think my block has an issue. I measured all the new chains inside length with a caliper and they are all the same. So i probably need to get my block align honed or something. Idk. Im just going to send it with a new rollermaster set for now.

grinder11

iTrader: (1)

I've never had an issue with Rollmaster. They are a very good chain.

jayyyw

My builder uses a matched set of billet gears and they come with a chain. I believe JP Performance is who makes them and they are always pretty tight once all installed.