Slant Six Forum :: Cam Degree

this was mentioned in a thread

'Doc's method of degreeing the cam by pulling a dowel pin and putting the head on the block off by one cylinder'

could some one explain this method, advantages ...

thanks

I can only assume it's an attempt to use the head as a piston stop...?

Seems like a lot of work if that's what it is.

I also don't have a good way of measuring Lift with the head off.

I think his method is intended as a low-buck, down and dirty type method for the guy who doesn't have a lot of stuff lying around.

For most guys, having junk lying around the shop is not an issue so it's easier to use a piece of scrap metal with a 2 or 3 holes in it to make a stop.

Author:	DadTruck [ Mon Feb 22, 2021 7:57 am ]
Post subject:	Cam Degree
this was mentioned in a thread 'Doc's method of degreeing the cam by pulling a dowel pin and putting the head on the block off by one cylinder' could some one explain this method, advantages ... thanks

Author:	GregCon [ Mon Feb 22, 2021 10:03 am ]
Post subject:	Re: Cam Degree
I can only assume it's an attempt to use the head as a piston stop...? Seems like a lot of work if that's what it is.

Author:	Jase [ Mon Feb 22, 2021 3:47 pm ]
Post subject:	Re: Cam Degree
Quote: this was mentioned in a thread 'Doc's method of degreeing the cam by pulling a dowel pin and putting the head on the block off by one cylinder' could some one explain this method, advantages ... thanks I can only guess that it is within the context of rebuilding the engine, Dowel pins removed all ready, and one can see what is going on as "visual aid" to the process for those of us who are new to the cam phasing/degree process.

Author:	volaredon [ Mon Feb 22, 2021 3:50 pm ]
Post subject:	Re: Cam Degree
Quote: I can only assume it's an attempt to use the head as a piston stop...? Seems like a lot of work if that's what it is. yeah. He mentioned and showed it in his book.

Author:	DadTruck [ Mon Feb 22, 2021 4:45 pm ]
Post subject:	Re: Cam Degree
Interesting, I have never degreed a slant with the head on, its a lot easier to just use a piece of flat stock across a bore with a short through bolt as a piston stop. Balance a pushrod straight up from a lifter against a dial indicator, direct and simple way to get the data point measurements.

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Cam Degree https://slantsix.org/forum/viewtopic.php?t=65791	Page 1 of 1

Author:	Dart270 [ Tue Feb 23, 2021 4:48 am ]
Post subject:	Re: Cam Degree
I have always done it with head off, with strip and bolt across the cylinder. Lou

Author:	Greg Ondayko [ Tue Feb 23, 2021 5:23 am ]
Post subject:	Re: Cam Degree
I am the odd ball. I have never done one with the head off. I just use the 0.050" method for finding the tdc due to the dwell at perceived tdc. I also don't have a good way of measuring Lift with the head off. Greg

Author:	GregCon [ Tue Feb 23, 2021 11:43 am ]
Post subject:	Re: Cam Degree
I think his method is intended as a low-buck, down and dirty type method for the guy who doesn't have a lot of stuff lying around. For most guys, having junk lying around the shop is not an issue so it's easier to use a piece of scrap metal with a 2 or 3 holes in it to make a stop.

Author:	Rick Covalt [ Tue Feb 23, 2021 3:54 pm ]
Post subject:	Re: Cam Degree
Quote: I also don't have a good way of measuring Lift with the head off. I have done it with head off and on. Usually it is on. If it is off I have a small scrap of aluminum angle bolted to one of the head bolt holes. Another hole is directly over the lifter and I drop a push rod into that hole and set my dial indicator up right on top of that.

Author:	slantzilla [ Tue Feb 23, 2021 4:25 pm ]
Post subject:	Re: Cam Degree
I made a plate that stretches across the #1 hole and overhangs the lifters. It has a hole for a pushrod and provides a mounting spot for the dial indicator. It also has a stop bolt for tdc.

Author:	Fopar [ Wed Feb 24, 2021 9:09 am ]
Post subject:	Re: Cam Degree
I JB welded 3 old lifters end to end one at bottom cam side down with top one pushrod side up in a hunk of angle to keep all in alignment. sand off excess JB weld use as a long lifter with head off. Richard

Author:	MadScientistMatt [ Wed Feb 24, 2021 10:27 am ]
Post subject:	Re: Cam Degree
Quote: I think his method is intended as a low-buck, down and dirty type method for the guy who doesn't have a lot of stuff lying around. For most guys, having junk lying around the shop is not an issue so it's easier to use a piece of scrap metal with a 2 or 3 holes in it to make a stop. In addition to using the head as an improvised piston stop, he also uses the valve gear to see when the valves have started to move, so you don't need a dial indicator. This is done with only the #6 piston in place, so the engine still spins freely.

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