343

Pistons can be a "cost problem" though.
The 343 stock heads should be rectangular exhaust port, but same big valves as the 390.

Biggest challenge is a shop and a person who knows in-and-out all the AMC V8 "watchouts".

imho engine shops can get "flustered" since they do so few an AMC they can be a "headache".

Even finding the correct parts can be more of a challenge than other brands.

And every single piece part and feature MUST BE CHECKED and INSPECTED...

even the journal diameters on a new camshaft and new cam bearings should be checked ! for example.

Someone here recently had an oiling problem and found a MISSING HOLE in the Oil Pump Gasket !

It really is a LOT to go into to collect and re-iterate how and what to do...

Brandosst wrote: I believe the heads are dogleg.Does that mean square or rectangle? These are definately rwctangle ports.

The exhaust ports on dogleg heads look like this:

Whereas, the stock 343 heads have rectangular exhaust ports. Dogleg heads can be used on a 343, but you have to use a 70 & up intake, or slot the centre holes on the existing intake. It's a fairly common mod which allows use of the free flow exhaust manifolds. If you're planning to run headers, then the head swap likely won't do much for your intended use.

 

 

Built my 343 in Berwyn I’ll suburb of Chicago 

And I did it high rise , headers , valve train and heads ,

Solid axels   You know the rest 

Any ways short story 

Just got in the amx , car in primer running sweet, I take out local roads go on a small high way after a bit keeping the revs pretty low doing about 2200 rpm it was a 7 k engine ,and a long side me pulled up a Ferrari we’re both even and I........

End of story never punched it engine was to new and 

Now all theses years later and I never got to race that car wish I would of 

She was chopping at the bit 

so long ago

Gary