Moparts Tech Archive

Slant Six

Slant 6 heads?

I am at a friends house. He has a 80 van with a slant. We are thinking it maybe a bad valve that is causing him to fail emission testing. If this ends up being the problem can we swap a rebuilt head from an earlier year? I believe it is a hydralic cam in the 80, I know the other one is solid. What says youze guys?
He has a high HC level.584ppm 300 is the limit.
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slantzilla
Moparts Member
Posts: 891
From: lyons.il.USA
Registered: Oct 2001
posted 06-28-2002 06:07 PM

I don't think the hydraulics started until '81. It's easy to check though, just look in the oil cap and see if there are adjusters on the rockers. Hydraulics were non-adjustable. I don't think a solid head will flow enough oil to the rockers to pump up the lifters.

The peanut plug heads started in '74 or '75
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Rug_Trucker
Moparts Member
Posts: 1998
From: Near Nashville, TN USA
Registered: Aug 2000
posted 06-28-2002 08:06 PM

He told me they were nonadjustable. (He has had the VC off before.) He got some bad information. Told me the plugs weren't too old. The cap and rotor was TOAST! We are gonna do it up tomorrow and bet I get his problem solved!
BTW this engine doesn't have buckets for the plugs and the weird spark plug ends. When did they start that?
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Fairly Strange
Moparts Member
Posts: 1845
From: Gardendale, AL.USA
Registered: Nov 1999
posted 06-28-2002 08:57 PM

Hydralics didn't come in 'till '82.
They ended the "funky tube thing" back in the early '70's.(or maybe sooner...not sure)

Do the adjustments and tune-up....bet that will do the trick.
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MoParMan
Moparts Member
Posts: 934
From: Castlegar, BC, Canada
Registered: Nov 1999
posted 06-28-2002 11:27 PM

The difference in heads is the early ones with the tubes have no port for the EGR valve and also do not have a hole into the water jacket for the CCEGR sensor. Plus, they leak oil pretty bad.
I like the later heads due to the fact that you don't have the leaky plug tubes, but if you remove the silly CCEGR sensor, you can now install an aftermarket mechanical temp gauge!
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CrAlt
Moparts Member
Posts: 2082
From: CT Posts: 45,909
Registered: May 2000
posted 06-29-2002 12:05 AM

like slant said the tube heads went away in 75ish...
The Hyd cam slant started in 1981. I had a doba /6 and it was solid cam.
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