[TAQuest]

Looks like an I V to me.

It also has 540 233.

[Stan Weiss]

With the cam in the engine and nothing but a dial indicator it would have been very easy to get max lobe lift. Which could have helped identify which cam that was or was not.

Stan

[TAQuest]

Originally Posted by Stan Weiss

With the cam in the engine and nothing but a dial indicator it would have been very easy to get max lobe lift. Which could have helped identify which cam that was or was not.

Stan

Had no idea it wasn't what it was supposed to be.

[Stan Weiss]

Originally Posted by TAQuest

Had no idea it wasn't what it was supposed to be.

I understand that. But you still don't know what it was and if that was the problem. The Pontiac 066 cam was stamped with an N.

Stan

["QUICK-SILVER"]

Measure lobe height now that it's out of the engine. Post a pic of the lobes...041's are pretty bullish over the nose.

Clay

[TAQuest]

Originally Posted by Stan Weiss

I understand that. But you still don't know what it was and if that was the problem. The Pontiac 066 cam was stamped with an N.

Stan

These figures are two separate hand stamped letters because they are not in perfect alignment with each other. It is an I and a V.

[TAQuest]

The lobes measure 1.578 and 1.591 . Picture link below;

https://share.icloud.com/photos/0FsD...r_Township,_MI

["QUICK-SILVER"]

Originally Posted by TAQuest

The lobes measure 1.578. Picture link below;

https://share.icloud.com/photos/0FsD...r_Township,_MI

Measure base circle and subtract from over all height measurement for lobe lift. Lobe 2 and 4 are exhaust/intake for #1.

Cam does not look like an 041 to me. That shape reminds me of an 066 or what the E-cam on your list would look like. The E-cam lobes should measure
I .280" and E .294ish"

Just saw the edit. The difference you showed would be right for the E-cam. O41 would have the same lift on both lobes and have a much rounder shape on the nose.

Clay.

[TAQuest]

First two are .294 and .297.

[TAQuest]

I think the ram air IV had .313

[TAQuest]

The Edelbrock 2157 on the receipt is supposed to have 0.280 and 0.295

["QUICK-SILVER"]

Originally Posted by TAQuest

First two are .294 and .297.

First two are both exhaust lobes. Next four are intake lobes. That .294 and .297 are dang close for that e-cam.

[TAQuest]

#5 is .281

["QUICK-SILVER"]

Originally Posted by TAQuest

#5 is .281

That'll be the original e-cam on the list.

If I can find a letter writing type program on this computer...Can give you directions to check duration using your caliper.

Clay

[Stan Weiss]

Correct, just knowing lobe lift can not tell you absolutely if it is a give cam, but it can absolutely rule out a give cam.

Stan

[TAQuest]

So now we are back to the timing set was a tooth advanced. I've heard that type of line up can cause dying at mid rpms. And also showing an unrealistically high compression check.

I must have been missing something the day I tried to tune it after I lined the dots up. Simple answer.

Now I'm going to have a better cam. It's all good. That puny cam needed to go anyway.

[STEELCITYFIREBIRD]

Assumptions running wild and varying all over the place.... that's why we use precise measuring devices and a verified reference point(TDC).
Without them... useless "data" if you can even call it that , as productive and enraging as trying to navigate traffic with your horn, and it makes those doing it the right way shake their head.



I really don't know why some are PM'ing you, So what is said can not be refuted or verified?
It may put good or bad info and ideas in your head, but why not post in the main thread?



Anyhow....moving onward

So unless I missed something in this novel, was TDC off on the balancer?
Was cam timing off from new TDC to old TDC, if TDC was off?

[TAQuest]

Originally Posted by STEELCITYFIREBIRD

Assumptions running wild and varying all over the place.... that's why we use precise measuring devices and a verified reference point(TDC).
Without them... useless "data" if you can even call it that , as productive and enraging as trying to navigate traffic with your horn, and it makes those doing it the right way shake their head.



I really don't know why some are PM'ing you, So what is said can not be refuted or verified?
It may put good or bad info and ideas in your head, but why not post in the main thread?



Anyhow....moving onward

So unless I missed something in this novel, was TDC off on the balancer?
Was cam timing off from new TDC to old TDC, if TDC was off?

Guilty as charged sir. All I can say is sorry. This hasn't been making any sense to me and I thought I was the Pontiac guru since 1979, lol. So you get schooled when you think you are so smart. When you are wrong you learn something.

Moving forward;
Using the piston stop I made I verified that TDC on the balancer is correct.

Addressing the PM question; Some members want to direct connect to help someone. Probably have various different reasons from past experiences here that makes them prefer that method of helping. I appreciate everyone's help.

[TAQuest]

I think the biggest problem I'm having understanding what went on was that I really can't believe the previous owner made such an obvious mistake installing the timing set. Looking at the picture of how it was, it makes no sense that anyone who could do such nice work putting the engine together could make such an obvious mistake.
Stranger things have happened but it seems like a long shot.

[chiphead]

Like you said, if the guy was sick, he could have missed it. Even healthy its an easy mistake to make with a multi-way timing set. That's the importance of keeping build notes and build sheets. If I get hit by a bus, there are notebooks in my shop and excel spreadsheets on my computer that show how my recent engines were done. Including the always popular cam degree results.