Ok I am swapping in a slightly bigger cam, and noticed my stock LT1 timing chain is sooo damn loose its scary (alot of stretch for less than 10k miles on new set). So anyway I am looking to go with a aftermarket more hi-po set... one with preferable multi-index keyways in the crank sprocket just in case my new cam doesnt install perfectly degreed.

I have read some mention Cloyes, but do not see its availability nor cost. I have also heard it requires clearancing... but I dont mind that soo much as cost.. as long as it is still more Hi-Po oriented.

I have also seen the GM unit, but it is like $300 and apparently still has a flimsy chain... which can be compensated with a bigger crank gear for another $40 or so. Then it still would need a multi-keyway lower gear if the cam isnt degreed properly straight up.


Can anyone guide me to the best solution here for optimum performance at best cost?


Thanks,

Rob

 

Ok by further searching it looks like the best option is Rollmaster part number CP8305 or SBC chevy timing set w/factory hydraulic roller. Price is $79.95 from Competition Products in Wisconsin 1-800-233-0199. German IWIS Chain, Billet Steel Gears, 9 Multi-indexable crank gear.

Cloyes 9-3145 is also used, but I dont think it is billet steel, plus the crank gear doesnt have 9 keyways for more precise cam degree'ing.

To run either on a 93-94 you must get the following:
1) 1995 Front Timing Cover (Includes Round seals) 12552426
2) Front Timing Cover Gasket 10128293
3) 95-97 Optispark Vented 01104032
3) 95-97 Optispark Vented Electrical Harness 12130319
4) 95-97 Optispark vent and vacuum harness 12555323
5) 95-97 Optispark O-Ring (need 2) 10474278
6) 93-97 Water Pump Gasket 10128343
7) CSR CSI-901LT1 OR Meziere MEZ-WP118HD Electric Water Pump
8) Camshaft with the big pilot hole (.500" x 1.0625" ) and the long (.685" ) dowel pin
9) Grinding/Clearancing is/maybe necessary on the New Timing cover to clear the chain/gears


Just a note that I havent done anything yet so some of this MAYbe wrong, but a few hours of researching/collecting data has led me to the above list. I will try to edit it once more info becomes available.


Rob

 

I've never tried this, but it seams like the way to go, what's the deal with a '96 having the OBDII stuff, do you know what I will need to do there?

 

From what I gather you are lucky and will only need an electric water pump and whatever Timing set you choose. Of course its the perfect time to swap in a better cam too

 

Get the Cloyes ED and it has a single roller chain.If your cam needs repositioning then ya have to send it back and get the right one.This ain't an early model where ya can advance or retard the cam with offset keways,bushings or multipal keyway's
With the Cloyes ya can run your stock WP and no cover grinding.It is as strong or stronger than a 2 row roller, based on chain pin size.Ya can run your complete stock front end set up and no brain damage.

 

What is the Cloyes ED? If it still drives the Water pump isnt it just a GM setup? From what I read (if we are talking same thing) is that the Cloyes non double roller is nothing more than GM setup with "possibly" a better Chain (GM stamped on gears)?? Also, how much is the Cloyes ED? After seeing my stock chain stretch ridiculously, and noting how heavy that setup is, and with stonger valve springs and more radical cam, not sure if its a good idea to take chances with a flimsy chain. I am interested in what you are talking about, just worried about not being sufficient.

In regards to the degree'ing (or not degree'ing) the camshaft, are you saying to not do it because it throws off the opti in regard to degree of ignition timing relative to crankshaft position? If so, I am looking to get a custom cam.... so not sure where i would stand in the event of it not degree'ing in properly... or what I do if any outta the box would work either. I do know my CC305 degree'd in, perfectly IIRC (who knows where i was at with chain stretch tho).

Rob

 

You need to remove the reluctor ring and turn off the misfire detection in the PCM or you will throw codes.

 

Cloyes makes ALL GM chains to the Generals spects.The ED is like the LT-4ED chain except to Cloyes spects.I am running one on my shop car with 260#on the seat and 760#on the nose and an electric WP(hp).Ya should not have a problem with your set up as far as spring pressure goes.Mine was not close to $300.00 but I don't remember what I payed.Ya can get the GM spect crank sprocket or"over sized" which means the same as early SBC.GM spects out a smaller sprocket to help take some of the load off of the front cam brg when used with gear drive WP.
Degreeing a cam is just to check it's phasing with the crank.What I am saying is it's OK to check but don't move it with the chain or sprockets in any manner.Send it back and get one that checks on spect and if that means the cam maker has to grind another one,well they should have done it right the first time.BTW 99.5% will check on the money.If I install a Crower--having done their cams so much and checked every one in the early days-- I don't even check anymore I just put um dot to dot and never been let down. If I use somebody else's I will check.Never hurts to check and have that warm fuzzy feeling that it is correct.

 

Thanks for the info. I used the GM LT-4 ED chain in my stroker, when I did not have much knowledge about LT-1 stuff. But I'm doing a new motor soon and this is the kind of information I need.

Being in california, I am swamped with smogg issues, does turning off the misfire detection show up to the smog tech?

 

That I couldn't say for sure. It probably will since it's an emissions type system.

 

Ok. So I definitely will just check the Cam timing, and complain back to the maker if it doesnt align, but I am still not convinced the Cloyes ED is sufficient, nor is there a cost??? I cant find it when searching, so anyone have an idea on the Cloyes ED cost or reliability?


Thanks,

Rob

 

The single roller LT1 replacement set is PN CLO-9-3151. Summit has it for $349.95.

 

Yeah thats a steal

 

Call Cloyes-- mine wasn't that much.There are some out there(Comp) that are close to 500.