hi
just looking to see if any one out their can help
Thank you
chris

 

Chris,

I've never had or seen the valves out of a real 302 Z engine, but I would be very suprised if the valves were longer than other small block chevy engines produced by GM. If the valves were different length the valvetrain geometry would be different and require special push rods and/or rocker arms among other possible changes.

 

Generally, a valve is 5"-6" long, including head and stem.
Stems are usually 1/2"-3/4" shorter than the overall length.
Sure you are asking about the spring free length?
Free length depends upon the wire diameter, spring OD, and number of coils.

Installed height of the OE GM spring, non-Z/28, is 1.70" giving 80 lbs of closing pressure.
Also the same method in checking spring rate/condition.
Spring height does not include oil deflection cover and retainer, just the spring itself.
Add spring shims to adjust height.

 

Pretty sure OP is asking about the tire valve stem, not intake and exhaust valves. Re: dill cap is the correct cap. Chris, I have no idea if 2 1/8 is correct, but sounds about right. Most valve stems just come in two lengths and two diameters. We always referred to them as skinny/short, skinny/long, fat/short, or fat/long. The ralley wheel with the trim ring would require skinny/long. The short ones fit and work, but just barely, as the tire inflator usually hits the trim ring while trying to inflate.

Hope that helps. I think I have an original wheel at the shop that probably has the original stem in it. It had an original 1969 assy line spare mounted on it when I got it, and the spare had only been on the ground once or twice. Still had some evidence of the little "tits" on it. I can measure tonight when I go by.

 

Dill cap? Is that a local term Lynn? Never heard of it.

 

It's the manufacturer
http://dillaircontrols.com/dill/

I believe the name was on the valve stem cap.

 

dill cap is correct! you have rallys? I figure it should stick out about an inch from the trim rings.

 

My Dec '68 built Z28 still has the original spare. It's an AD wheel and Goodyear, so I can measure the valve stem length tonite when I get home and post it for you Chris.

 

That part about "valve stem" in the original post was a bit confusing. When you got to the part about 2 1/8", now that should have given us a clue that some were on the wrong path. Now dill cap...that sounds like a term that a kiwi would manufacture. It sure threw me. Now I wonder if my dill caps are over torqued and my dwell bearings are dry.

 

My Z28 has some NOS ones, they measure 1.550 from the OUTSIDE of rim to the top of the stem with out the Dill Cap on. The Dill caps say Dill 1B 627. The 1B is the dating.
2&1/8" would be too long IMO.

 

Oh, the wheel valve stem.
I bet this will be on the test Friday afternoon............

 

As I mentioned earlier, I just went and measured the valve stem on my original Z spare and using the same rim to end of stem measurement without the cap, I get 1-5/16". I also dropped the original spare out of my Feb 69 built Corvette and the measurement is the same for that stem also. Hope this helps.

 

LOL. I was wondering what the heck a dill cap was......

 

Geez, there's no end to what you learn on this website ! :yes:

 

I've never seen an OEM wheel with long stems, only short. Some oldtimers tool box is propably full of those Dill caps that they removed from cars getting full wheel covers and stem extensions.

Jeff

 

Isn't a dill cap the lid of a pickle jar?

I can remember guys talking about scouring the bone yard for vintage GM cars, to get the Dill caps off them. Another one of those little details on a restored car.

 

When I finished my Firebird I had my local garage mount the redlines. The caps were the correct Dill so apparently they are still making them as I didn't specify them. They were no charge with the mount and balance. There is two pages full on Ebay, or you can go to a tire shop and buy a box full.

 

Style 3 & 4 are "Dill" valve stem caps. They were on GM and Chrysler products right up until the tire pressure monitoring stems with metal caps started a few years ago.

:beers:

 

Everyone,
Thank you for all your help and laughs.I was talking about a wheel valve stem which I am getting the idea its 1 5/16" long and the "Dill" cap.I love this site we can have fun and learn.
Thank you for your help
Chris
Ps I have the "Dill caps" and I am on the hunt for the WHEEL VALVE STEMS any one know where to get the correct Wheel valve stems LOL

 

Chris, look up PacecarJeff as he was selling them and should be able to fix you up. Are your dill caps originals or the new ones? Could swear there was something different about the new ones compared to the original ones but it it took a close inspection.

 

Thanks for the tip I will look jeff up.And I will check them out to see if they are old or new

 

Well, I was guessing wrong. I looked on the original YH wheels I have that I BELIEVE still have the original stems, and they were the short ones.

BTW, here are a couple of more pics of a dill cap.

Don't have any pics of a dill hole, but I do know a few.

Lynn