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Messages - Tx-Z 302

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Originality / Re: 1968 Z28 water pump bypass fitting
« on: September 18, 2018, 01:51:26 AM »
X2 on hex but limited originals observed but believe that to be what is considered technically correct. Here is an original with stampings.

is that plated brass? or steel with yellow/gold primer?

Forum members that live in the country of Texas should call Patti or Kerri at Firewheel Classics.
They are in Wiley, just north of Dallas. Very good prices, several specials run throughout the year, THE best customer service ever!   1-800-711-0125

General Discussion / Re: Setting up valve springs?
« on: September 13, 2018, 12:49:04 AM »

Not a pro here, just trying to help.
Darrell posted some good links.  Those guys are racing and do a lot of tear down, check and reassemble but maybe you will just build it once and drive?  Those guys will add shims as the spring looses pressure over time until you cant add more shims.  At that point, they replace a spring. Tear downs and checks happen pretty regularly for those guys.   

I do not do that.  Maybe pay attention to what they are doing, and just do it one time to set up your heads. 

The spring requirements are set by the cam supplier.  The required seat pressure and spring rate are what you need to keep in mind.  The "spring rate" is how stiff it is as it compresses.  The spring will provide a stiffness described as "pounds of force per inch of deflection".  How stiff is the spring?  Just math.... (Open pressure-seat pressure)/(installed height-open height) = Spring rate....expressed as "pounds of pressure/inch of deflection".  "Open pressure" comes from the "open height" spring specs, not the actual cam you are using so don't get confused.  Springs can work on more than one cam so the spring spec needs to be generic.

Installed height gives you "seat pressure".  Full actual cam lift gives you "nose pressure".  Need to have enough pressure to control the valve train but not so much that it wears or damages components.  Your valve train cost and complexity will increase as spring rate goes up. 

Add shims to provide the required seat pressure on a spring that meets the spring rate required but make sure you have at least .030" available additional spring travel available before you go into full spring bind zero space between the coils.  Watch the actual installed nose pressure to determine if you need to upgrade the studs, rockers, seals, pushrods, guide plates, etc.
Thanks for the info. I watched the videos in the links and understand the general principal of what he's doing.....finding values to be able to add shims over wear time to increase the usable life of the springs while maintaining his proper pressures.   I guess I'm wondering if I have a virgin head and buy a cam/lifter/ spring set. Do I still need to do this?  I bought a comp cams complete cam kit ?

General Discussion / Re: Setting up valve springs?
« on: September 11, 2018, 01:13:11 AM »
Learn it and use it.

Good Lord! I've built several engines in my time, degreed came, recurved distributors, etc etc etc.... But never really messed with valve springs other than getting the ones recommended for my cam?  Have I been leaving power on the table or is this a wear and tear issue?

General Discussion / Setting up valve springs?
« on: September 10, 2018, 11:07:57 PM »
So what's the abridged version of how and why " setting up valve springs" ?

Restoration / Re: GM hood hinge springs
« on: September 09, 2018, 07:25:23 PM »
So what's this washer trick for spring replacement?

Originality / Re: 1968 Z28 water pump bypass fitting
« on: September 09, 2018, 07:19:14 PM »
I'm in the market for one of these!

General Discussion / Re: 814 alternator on TC site
« on: September 05, 2018, 02:05:19 AM »
I think it was the other way around. The 4 was too close to the 1.
You just might be right Jon ! Lol

General Discussion / Re: 814 alternator on TC site
« on: September 04, 2018, 09:13:25 PM »
Not surprised that one sold quickly!

Yes it did. Interestingly enough the 1 and 4 spacing on this one is a bit wider than most? Kinda like the one I was advised against. Lol

General Discussion / Re: Need help on GM intake manifold
« on: September 02, 2018, 01:09:45 AM »
L48/L82 350

Seems nice. I can't use it though.....I clicked on the link and looked at the box. It says WARNING !  Cancer and reproductive issues???????

General Discussion / Re: 814 alternator on TC site
« on: August 22, 2018, 12:59:50 AM »
So I took all your advise, made a deal with the team Camaro seller and John Pirkle Jr.   Pirkle  Jr has been very pleasant to deal with. He has the alternator and give it a 95 percent thumbs up. He even disassembled it to check the date clocks on the inside of housing to make sure they preceded the date stamped on the outside. Plus a few other tell tale things that he claims a counter fitter would likely not know to look at.  His conclusion is if itís fake, itís the best fake on the planet, and done with absolute precision. I asked about the 1 and 4 being so close together, he says itís not as uncommon as most believe and that heís noticed it a lot on later runs of the same number alts, starters etc where the stamps start to wear a bit and get sloppy, he also said spacing isnít nearly as critical as all the digits being in line?  So now Iím asking you guys .... 800 or not ?

General Discussion / Re: Opinion on 1100814 Alternator stamp
« on: August 07, 2018, 05:31:01 PM »
Looking at BOTH of my cars and some other pic's.... It looks like the 4 is to close to the one?   Danny
    I had the same thought about the 1-4 spacing but I'm not an expert either.

General Discussion / Re: Opinion on 1100814 Alternator stamp
« on: August 07, 2018, 03:13:47 PM »
If the ebay seller is in TN or Angola IN, and has plenty of other items that "have been in storage 40 years", then I would suggest best avoided.
Oklahoma city

General Discussion / Re: Muncie trans question
« on: August 07, 2018, 02:52:58 AM »
In my Muncie group I believe it's just a press fit and the tail shaft gear can move, I will share your post in the group, the founder of the group is a professional Muncie rebuilder as his regular job.
id sure like to join a muncie group?

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