Will the early head with tubes and the later small plug head v/c interchange?

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81 LeBaron Salon,88 5th ave,79 Aspen SE wagon,79 W150
Don't worry, nothing is going to be alright.

Yes. All slant six valve covers are interchangeable. There will be differences in PCV and breather plumbing.

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Thanks a bunch,thought I read somewhere they were differant

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81 LeBaron Salon,88 5th ave,79 Aspen SE wagon,79 W150
Don't worry, nothing is going to be alright.

Yes, they are different on the hydraulic lifter motors.
There is notch on the front lower corner.

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

They are 1960-1980 valve covers will interchange with all slant heads of those years. 1981-1987 valve covers will interchange with all slant heads of those years. 1960-1980 valve covers will not work with 1981-1987 heads and vice versa. The change in the valve cover sealing profile coincided with the switch to hydraulic lifters. I don't know why they changed the valve cover profile. It wasn't necessary from an engineering standpoint.

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Casually looking for a Clifford hyperpak intake for cheap.

Learned something new.
Sorry about that, don't want to pass bad information!

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The notch is a killer for those who have it and want another valve cover...My wifes 64 has a hydo engine in it....the dog leg on the front corner is an oddity for sure. Whats funny is I am building a new engine, and we did block filler.We torked a head the machine shop had laying around, and it is a dog leg style.I explained that the difference to them was. You just need an extra valve cover? early or later?

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Wife's: 64 Valiant
My: 70 Road Runner, 67 Barracuda, AND the 62 Valiant drag car!!

There are actually other differences as well. The 1960 valve covers had the road draft tube instead of the PCV valve, and the early 60s valve covers had the chimney for the push on style crankcase breather.

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Casually looking for a Clifford hyperpak intake for cheap.

OK now I know,if you're not careful you;ll learn something new everyday.I bought a 77 truck with a bad engine was supposed to be a later model engine.When I pulled the V/C and saw the adj. rockers I knew I had a problem.I was going to rebuild the head for my 81 for a later project.

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81 LeBaron Salon,88 5th ave,79 Aspen SE wagon,79 W150
Don't worry, nothing is going to be alright.

The heads will interchange too, but you have to make sure to use the right rocker gear for your shortblock. And rocker cover.

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Official Cookie and Mater Tormentor.

I am nit-picking here, and normally wouldn't bother slantzilla about anything he writes since he has much more experience building motors than I do, but the rocker gear has to match the cam, not the short block. You can run a "hydraulic" head on a "mechanical" block using a "mechanical" cam so long as you use the "mechanical" rocker arms and rocker arm shaft. You can run a "mechanical" head on a "hydraulic" block and a "hydraulic" cam so long as you run the "hydraulic" pushrods, rocker arms, and rocker arm shaft. The one thing to watch out for is the rearmost hold-down bolt in the rocker arm shaft It went from a single width to a stepped width around 1977. The rearmost rocker arm shaft hod-down bolt must match the cylinder head you are using. When using a hydraulic rocker arm shaft on a pre-1977 (or so, double check on the head you want to use) you must drill out the rearmost hole in the hydraulic rocker arm shaft to allow the larger pre-77 rearmost bolt to pass through the bottom of the rocker arm shaft.

For example, my brother's 1983 Dodge van is currently running a 1976 225 block, a 1972 198 head, and a 1983 hydraulic cam and valve train. Everything works happily together but we had to drill out the rearmost bolt hole in the rocker arm shaft.

I have also personally installed and seen run a 1983 225 hydraulic bock and valve train with a 1960s era head. No problems as long as the correct rear rocker arm shaft bolt was used.

See more info about the nuances of the differences between the mechanical and hydraulic valve trains here: http://www.slantsix.org/forum/viewtopic.php?t=46756

Finally, the valve cover must match the head, nothing else. 1960-1980 heads need the 1960-1980 "mechanical" valve cover. 1981-1987 heads need the 1981-1987 "hydraulic" valve covers.

Hopefully that will clear things up a bit about mixing and matching hydraulic vs. mechanical era components.

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Casually looking for a Clifford hyperpak intake for cheap.

What's this dog-eared notch? Any pictures for clarification?

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Not that I need to know ,just curious. What about the Offenhauser Valve covers? Do they fit everything? or which specific years?

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1964 Dart GT

As far as I know the Offy VCs only fit 60-80 heads. There were chrome VCs made to fit the 81-87 heads, both by Mopar and other aftermarket companies. I will get some pictures of the difference in the heads.

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Casually looking for a Clifford hyperpak intake for cheap.

Offy covers are early heads only. I just compared the late and early covers lastnite. I will post some pics later tonight. I was thinking a 1/2" adapter could be fabbed up so you can run an offy on a later head.