I have a question regarding the cam timing. I'm measuring an angle of 93.5 degrees when it should be 110 degrees. I beleive I followed this procedure right: http://www.compcams.com/catalog/COMP2012/pdf/COMP_Catalog_2012_408-409.pdf

I measured an angle 135 degrees going clockwise after the max lift. At .05" down or 1.27mm (since I only have a dial gauge in metric)

I measured an angle 52 degrees going clockwise before the max lift. At .05" down or 1.27mm

A number this different makes me feel like I did something wrong however I've checked this quite a few times.
I made a picture showing a few things here: https://photos.app.goo.gl/2ucN9xoRkEa1mJfR2

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( Slant Six 73' Duster TBI )

Move the cam chain one tooth in the right direction and re-check. Many marks have been known to be wrong.

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2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!

12.70 @ 104.6

Yes, probably a tooth off. Also, FWIW, I would never run a 225 Slant cam at 110 deg centerline. 104 max, and 100-102 best for a perf NA cam. For boost and/or a really mild/stock cam you could go a bit later, maybe 104.

Lou

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Home of Slant6-powered fun machines

Okay. I've got the timing at 108 at now. Looks like ill have to move the gear to the +4 keyway to get it at 104. A regular jaw puller doesnt seem to fit so ill see what may work.

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( Slant Six 73' Duster TBI )

K. I got this to 104. Going to see about clearances tomorrow..

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( Slant Six 73' Duster TBI )

I ive checked cylinder number 1 with modeling clay. I honestly cant by looking at it tell if it touched it.
The clay is about 1/4" thick and i revolved the motor twice. I could feel slightly more resistance when the valves where opening but maybe that was the valve spring.
Before: https://photos.app.goo.gl/KW1lMzJZzMxKO7x73
after: https://photos.app.goo.gl/9QsfxreWCfhDyS0x1

Should i try it again but maybe form it a bit more square?

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( Slant Six 73' Duster TBI )

It may not touch with that thickness. It seems you are good to go.

Lou

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Home of Slant6-powered fun machines

That's what I was thinking.

I've got the replacement bolts in and installed. I ended up installing them at 55 lbft.

Should have a few things coming in Friday or Saturday then I hope to have everything back together by Sunday.

Something I noticed about the sprocket to cam gear is that the sprocket sits proud almost a 1/16" (I think). I measured with calipers from the block to the chain on both and 1/16 was the difference. Is that pretty normal? I feel that I've bottomed the sprocket out. I'm figuring its not ideal but with the slop in the chain it wont matter.

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( Slant Six 73' Duster TBI )

Head bolts? I would not even start the car unless they were torqued to 65 ft-lbs, and personally I have never run them below 70.

I have seen that offset, but am not sure if it's w/in factory spec or not. IIRC, on one motor is quite a lot and I did some shimming or milling to line things up better. Can't recall...

Lou

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Home of Slant6-powered fun machines

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Home of Slant6-powered fun machines

Nope. I was referring to replacement rod bolts. Good to know about the head bolts though.

Hummm. Maybe ill pull it one more time and look behind it for hang ups.

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( Slant Six 73' Duster TBI )

You must torque the rod bolts to the exact spec they did when they were honed to size. Different torque specs will alter the bearing bore dimensions to some extent. Did you fit new bearings?

Been a while since I last posted...

I moved from Tampa to Jacksonville. Had to rush and slam the motor in the car but I've got it running again. Only issue I've noticed so far is leaking around certain parts of the pan. Hopefully I don't have to pull it again for that...

I'm currently adjusting the timing and fuel. My wideband is currently not working so I'm waiting for a part to get the AFR right but it seems to be running fat on idle.

https://photos.app.goo.gl/XMvTEhhMaXmYnbPW8
When I step the RPM up it gets to a point where its stepping between two portions of a timing map. That will be smoothed out. The idle is at about 15 BTDC.

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( Slant Six 73' Duster TBI )