'94 LT1 "P".
Installing the gm hot cam and can't find part numbers that agree in two or more places for timing set and pushrods. I want to use GM parts.

I have called my nearest dealer and some of his p/n's don't agree with what I find on the gmpartsdirect.com or gmperformance.com web sites and these sites don't agree either.

The FSM doesn't show a clear enough picture to make out the details. I wish the FSM also gave part numbers.

Need gm p/n's for standard chain, cam sprocket and crank sprocket or a complete standard timing set p/n.
Have to use the standard chain since I already have the early MSD distributor installed. Wish I could go with the roller chain but can't now.

Also, I need to know if I have to use the longer (0.100) pushrods or standard length with the 1.6 roller rockers. And how long is the standard length? With or without guide plates? I don't want to order something I can't return.

I already have the new performance roller lifters with the stronger checkball springs and want to use the gm performance pushrods.

I have seen the unbelivable cheap prices to the most ungodly expensive prices on all sites. What have you guys used that's been through this mod?

 

Buy the complete GM Hot Cam kit which includes the roller rockers, springs, pushrods and the cam. Go with an electric water pump and use a double roller chain.

 

Do a search here and look for the phone number for Superior Chevrolet, Chris May still works there, ask for him and tell him what you are looking for. I assure you will get the correct parts and the price will be cheaper than GMPD. I just ordered this same timing set from him about 6 months ago. I had at least three other sets that Summit and locals had said were the correct item and no it wasn't.

Ok - now about Strick's comments

He is really right about this. If I had it to do over again from the initial planning stages I would have done exactly what Strick says to do, but I already had bought an early version MSD Opti, and new water pump.

However, if you haven't bought anything at all yet, you would be better to buy a later version opti-spark distributor for your '94, a Cloyes Double roller timing chain set, and an electric water pump. You will also have to by a plugged timing cover or plug your own. They sell plugs for the stock covers now too. After this is all said and done you will gain a few more HP and it will not cost much more. You will also have a stronger more accurate timing method.

The stock gears and chain provide no way to modify cam timing should there be a tolerance stack up in the components and timing is off. I got lucky with mine and the timing was pretty close to perfect.

Anyhow - I'm sure all this will give you something to chew on for a while.

 

OK guys. As I stated in my original post, I have already installed the MSD ProBillet distributor (early version) and a new water pump about a year ago, so the roller chain is out of the question.
I did buy the GM LT4 Hot Cam Kit with springs and roller rockers, etc., and it does not include pushrods.
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I have already bought a set of roller lifters with the stronger checkball spring, so the need for the better pushrods.
Now, do I need to buy the longer (0.100) pushrods or just buy the standard length that is in there now? Whichever length I need, I will buy new stronger ones.

I would like to buy a better (heavy duty) timing chain set than the standard one in there, but it has to fit in the existing cover. I can't seem to get any two vendors to agree what set I need to fit the early LT1 (not ZR1) engine.

Thanks for your comments.

 

Perhaps this is the reason the MSD distributor has the +/- 5* adjustment built into it.

 

That's exactly what I have thought and when the time comes, believe me, if I need it; I'll use it.

Good point

 

I bought the standard length pushrods on the advice of the guy selling HiPo parts for Speed Unlimited here in Maryland. He sells this crap over and over all the time, and I have grown to trust most of his advice. Since the heads have not been milled and deck are the same height, stock should be ok. I bought a pushrod length checker just to verify, but I didn't need it because I installed the factory length pushrods and then checked the geometry using the method Lloyd Elliot told me to do and it was spot on. Here's the link below to make sure you have the correct length pushrods.

http://www.biggrizzly.com/Lloyd_words.html

As far as the timing set goes - Lloyd also told me that I could stick with the GM factory gears and be fat 'n' happy. Well he didn't quite use those words, but you get the picture.

Good Luck

 

Thanks, biggrizzly, this is what I needed to hear.

I knew that I needed the stock timing chain set....I think I have found the right one, finally.

The pushrod length was a major confusion. It looks like Lloyd Elliot was using the flat tappit lifter in his explanation but it probably would be the same test for roller lifters.

Its amazing the prices for the same part varies so much.

Thanks again.