[sprintbird]

It is in the center of the head. There is a boss that sticks up and is located in the hole. It is hour glass shaped. Sorry I don’t have a better reference at the moment.

[sixty8coupe]

Are we talking between the head and the block or the head and the cam housing? I'm more open to pulling the cam housing than the head again...

Is it something that is press fit? Bolt in? Would it fall out of the head was flipped over? Is it stuck down in a hole - I think you're saying it's down in a hole? I can't recall anything like that, but I also didn't know I was supposed to be looking for it.

I ordered some 3 hour long video someone recommended on rebuilding one. If it ever gets here I'll see if they mention it.

[Jeff Hamlin]

I would highly recommend you confirm Stem height on Valves and be sure the Metering tube is in place. It has been reported that it can dislodge during cleaning/machining and go unnoticed by machinist. The valve stem height is another issue with those not familiar with the OHC 6 engine.

[Jeff Hamlin]

I just went though the top end on my '66 and used a shop that I have been using for years.
Upon getting my head back I noted discrepancies and had to take it back over to them.

Sure enough the heights were not to spec and they knew/had this info prior,
they just forgot to communicate this detail down the chain. aka SH!T happens!

luckily it was caught before I set head in-place and it was corrected.
IMO it's worth taking it back apart if you are NOT sure of these critical points.

[sixty8coupe]

Excellent! Thank you!

I'm going to let the valves go for now. I believe the valve train was never touched, it all appeared original. If it's a problem, it should run like crap or have bad compression again.

I will pull the cam cover back off and check for that metering tube though! I wish I had taken more pics of the top side, I have a bunch of the bottom of the head, it would be great if it showed up in one of my pics.

Very nice looking motor/engine bay!

EDIT!

HA! Found it! There's definitely a metal sleeve inside of there.

[camerjeff]

If you have the cam cover off, put a strait edge across the top of the valve stems, they all should be at the same height, that will not tell you if they are actually sitting at the correct height, but every bad OHC-6 valve job I have ever run into has had 1 or more valve sittin much higher than the rest.

[sixty8coupe]

What is the correct procedure to measure their heights?

You guys have been an invaluable help! It's difficult to come across information like this, even through google search.

My rebuild video should be here within the next couple of days, hopefully that can fill in a lot of gaps.

[Jeff Hamlin]

Most Fellow Cammers are always willing help each other, it's the only way we can survive.
What is this Video you mentioned?

[sprintbird]

Richard McDonough’s rebuild CD. How to rebuild the OHC 6 and swamp coolers in the floor of your Cammer?

[sixty8coupe]

https://www.ebay.com/itm/66-69-PONTI....c100037.m2107

I don't know about the swamp coolers part, but I can't find jack squat on line other than the service manual which seems to be missing a lot of important information. Hopefully I'll learn something from it.

I rebuilt an entire 1996 Mustang T5 using the Hanlon Video. I had it stripped down to a bare shaft. Even pressed in all new bearings. That was 4ish years and at least 20K miles ago in my 65, still works fine. It had two gears with broken teeth and a broken set of shift forks. It was a $75 junkyard trans with unknown mileage.

DIST REBUILD FOR OHC6, ALSO APPLIES TO GM DISTRIBUTOR. OHC6 ENGINE REBUILD AND HOW TO IDENTIFY ENGINE PARTS VISUALLY. WHAT DOES AND DOES NOT WORK. ADDRESSES THE CAM BEARING PROBLEM OF WEAR. REBUILD A TRACTION CONTROL PONTIAC REAR END. PLAYS ON COMPUTER ONLY. MPG2 FORMAT.

[Jeff Hamlin]

Might need an interpreter for that one

[sixty8coupe]

Swamp coolers and interpreter... I'm guessing he has a heavy Cajun accent?

I have a hard time understanding the LSU football coach

[sixty8coupe]

Originally Posted by sixty8coupe

Swamp coolers and interpreter... I'm guessing he has a heavy Cajun accent?

I have a hard time understanding the LSU football coach

Ugh, and I just got notification that it just shipped today. I placed the order 10 days ago. I've sold a ton of stuff on ebay over the years, I never made a shipment later than 36 hours from when the order was placed. Hopefully it will arrive on saturday.

[calbird68]

There are a few good articles on rebuilding. The webrodder ones are good if you can get ahold of a copy. Covers everything from valve train to timing to oil pickup.

[Jeff Hamlin]

The Webrodder write up was pulled and as far as I know no longer avail.
Anyone that bought a full copy who wants to off-set some of the cost might offer a copy for a fee.

I'd be interested

This one by Hemmings has some good info, just not at detailed as the Rodder article.
https://www.hemmings.com/magazine/mu...x/3750446.html

[sixty8coupe]

Update:

I had to go to Oklahoma for work for a week, and being away from work for a week = stupid busy every time I get back...

I finally had some free time to roll the motor over (I already had it reassembled when some of the serious concerns were brought up). On my first pass I was excited because I got consistent compression across all cylinders (remember, I had 3 dead cylinders and 3 with different readings). I decided to check again and cylinder 2 was back to dead.

Thanks to this thread, I pulled the cam cover to find I had ONE valve that was clearly higher than the others. So I bought a bridge and checked all the valves. They're all 0.85-0.87 (within spec) except the exhaust valve on my dead cylinder... 0.89. That's enough to hang a valve open and lose compression. So I guess the head was rebuilt at one time, just wrong, luckily it's only one valve.

Thanks to everyone that has sent me PM's and emails, all of the information has been EXTREMELY helpful, thank you!


Question. I've read that my 1968 head *should* have the correct oil restrictor... but I want to be sure now that I have the right one.... how the heck do you pull it out without destroying it?

[Jeff Hamlin]

Your '68 would have had the tube with corrected bore if it's o.e.
If it has to be removed it would require removing head an tapped out from the bottom up/out
Some will come right out with correctly sized punch and others will not just due to age and/or condition of head.
Woodland Sports (Jerry Woodland/Fellow Cammer) offers new tubes as well as other somewhat HTF parts.