Got a Comp Cams 3136 double roller timing set for an 87up factory roller block. Tried installing it last night and the gears do not line up, they are a little less then 1/8" offset (crank gear is out further).

When I put the chain on it seems to be ok and has plenty of buffer on either side of the teeth inside the links, but I dont think they are supposed to be offset like that?

I am going to send the set back to summit and get it replaced with a cloyes set, but dont know if its going to do any good since theres probly a 1:100000 chance that comp fcked up making this particular set.

So...if the cloyes is the same way...what do I do. When the timing gear is bolted on, there is very very close to 0 endplay between the retainer plate and the tming gear, so thats good. The summit tech said I could turn down the crank gear and rechamfer it, but I dont know if I could do that an 1/8". What could possibly be wrong, and what are my options?

 

Alright, how about this. Im still going to send the comp piece back, and im going to get a rollmaster billet set (only $79 german chain and billet gears). If this one does the same thing, whats the deal with those torrington thrust bearings. It seems like if there was something in between the retainer plate and the timing gear that everything would be cool? Either that or what if I get another retainer plate machined a little bit thicker than stock?

Help please Im getting frustrated!

 

ive only done a heads/cam/timing set etc install once, although successfully, but heres my 0.02$ :

my crank gear was out about as much as yours. it just was not flush with the cam gear. almost exactly 1/8" as well. bolted everything up, and the car has ran fine since (i put about 30k miles on it). and i still keep in touch with the new owner, and its still fine. maybe its normal?? for reference, i put an lt4 timing set (non hd) on my lt1 motor. hth

 

Interesting, anybody thats used quite a few aftermarket timing sets on SBCs have any input on this. Im still sending out for the rollmaster, but if it doesnt fit I was planning on getting the crank gear turned down to make up for the difference...should I still do it, or is this normal?

 

I've used a bunch of different SBC timing sets from MANY different manufacturers over the years. Never had one off by that much. That's way WAY off. Two things I can think of....

1. The crank gear ain't all the way home against the crank flange.

2. You forgot to install the factory retaining plate between the cam gear and the block before you put the top gear on.

Beyond that we get into the realm of seriously wacky machining on the crank or the timing set. Neither one likely to be off by as much as 1/8" even if it is machined incorrectly.

 

The retaining plate IS on for sure.

The crank gear IS all the way on for sure, installed it 4 times to make sure.

I measured my crank against my buddies cast eagle crank, we measured from the outside of the front main journal on the crank to the flange where the crank gear sets, then from the nose of the crank to that flange, neither measurement was the same, but I dont think it would be the same crank to crank since they arent the same type.

I guess my question now is if the new one is off as well, am I cool to get the crank gear turned down?

 

I've heard this a few times with that particular comp chain, people still run them but I personally wouldn't.

 

Looks like compcams [EDIT - DO NOT OVER RIDE THE LANGUAGE CONTROLS] up on this one. Got the new Rollmaster billet chain today (after ordering a Gen1 SBC chain and sending it back..woops). Slapped it on and it fit PERFECT, straight edge against it was perfectly flush, still almost 0 endplay on the cam gear, plus it has timing adjustablility for 2* increments and I didnt have to use an offset crank key.

 

ROLLMASTER IS AN AUSSIE PART LIKE THE GTO

 

Im confused what you mean? A bad thing or something. I know for a fact the chains are manufactured in Germany, where the gears are made I dont know, but really dont care after looking at the quality of them, I mean CNCd billet steel is CNCd billet steel

 

no not a bad thing i sell tons of them

 

Is this the same set for 96 LT1? If so where did you get it?

 

It is if you have an electric water pump and you plug up the WP drive hole in the timing cover.

www.competitionproducts.com

 

92-94 lt1 have splined gear the 95-97 dont you cant interchange

 

Sure ya can...with an electric H2O and vented opti just consider it an SBC front setup.