What are you FI guys running for timing chains?
 

I've heard bad things about our stock chains such as braking on stock motors and excessive stretching and also I have heard of them never causing trouble on 11 second cars reving at 6600RPM.
My engine mentor says it is the RPM which is hard on the chains and since I am only going to be revving to about 6300 RPM that my recently replaced stock set should be fine. I would like to keep the water pump which was also recently replaced.

Is anyone here running the stock chain on their high horsepower forced induction car with success? :confused:

The motor is around 8.3-8.5 compression ratio 355ci 1997 LT1. The valve springs will have about 420 # open pressure, 160# on the seat and I'm shooting for maximum horsepower on up to 18psi from a T70 turbo.

Thanks

Since you have a 97, I am pretty sure you can run a double roller ($80) from summit. I got a lunati chain for my 94 but that was because I was to cheap to replace the cam, timing cover and buy a new 95 and up opti.

The stock chain should be fine for what you are going to spin it to.

Hope to see you around this summer! Also who is your engine mentor?

I'm using the LT4 ED with the slightly larger crank gear.

I'm using the same with the included crank gear (because the chain was plenty tight with the included gear). You can get the larger gear from Thunder Racing if you have too much slack.

I'm using a cloyes double roller with a 95 timing cover and electric WP.:)

LT4 XD Double Roller

Is there a GM LT4 extreme duty double roller? Every one I've seen is only a single roller... All the double rollers I've seen have been aftermarket.

The LTx Extreme Duty is not a double roller, but I've read from several sources that Cloyes claims the LTx ED is stronger than a double roller anyway.

Never heard any problems with the LTx ED going 7000 rpms or high hp on several cars in the area. Just make sure that you use a new water pump assembly/bearing and press on the wp gear that comes with the LTx ED set. If you don't, the harder LTx ED gear will eat the stock wp gear for lunch. :)

While I installed a wp drive on my recent engine build, I'm using an electric pump. The wp assembly's in there in case I need it in the future (i.e. road racing), but for street/strip use the electric pump will take some drag off the timing chain.

The larger Cloyes crank sprocket can be used with the LTx ED timing chain set, but I'd personally ensure you go with an electric pump if you do. The larger spocket will take up a bit of slack that's normally in the timing chain and having a water pump providing water resistance/inertia to any rpm changes may give you more problems than help. I've read/heard both sides of this larger sprocket idea and the only absolute I've read is that an electric wp is the way to go. :)

GM should have just went with a straight gear-driven cam and be done with it. :)

A guy named Ed Robinette is helping teach me how to assemble everything correctly. He is a local racer and doesn't know anything about these LT1's but as far as putting together the shortblock goes, he has done many through the years.
I'll have to get up to the Canton/Akron area sometime and check out your car if I ever get mine done!

I will either keep the stocker or splurge the money for that Lt4 extreme duty. I'd rather spend the money on a good wideband than replace my timing chain that is already in good condition

LT4 XD Double Roller used here as well.

Cloyes double roller, minus one link on the chain. :)

Not quite FI yet, but I am running a cloyes double roller and EWP.

LT4 ED here too. no problems to date. Should be called Extreme heavy duty. It feels like it weighs almost twice as much as the stocker.

Cloyes Hex-a-just & EWP here.

Ken R.

These double rollers you guys have. Did you have to clearance the timing cover? On 93 and 94 cars you are pretty much stuck with a single chain right?

Sean