Re: [AMC-list] time to find a stout 5

[Ken Ames <ameskg@xxxxxxxxx>]

"around 74+ used pressed in studs with bridged rockers"

Weren't these the one-piece-for-two-valve aluminum bridges - bolted to the head,
no studs? Around 1980 they realized the mistake of using softer aluminum and
changed to a 3-piece steel setup.

Ken 


Quoting Frank Swygert <farna@xxxxxxx>:

> Nope. All 70+ 360/390/401 heads are the same for the given year. In mid 71
> there was a change in compression made with a larger combustion chamber. So
> 70-early 71 have the small chamber and higher compression than late 71+
> heads. Up through about 73 they used screw-in single stud mount rockers,
> around 74+ used pressed in studs with bridged rockers. 304 heads were the
> same as far as years and combustion chamber volumes, but of course they have
> smaller valves and ports than the bigger engines.
> 
> ------------
> Date: Wed, 26 May 2010 09:06:50 -0700
> From: Jim Blair<carnuck@xxxxxxxxxxx>
> 
> Unless it's a '71 motor. IIRC those heads were 401/390 only?
> 
> 
> -- 
> Frank Swygert
> Publisher, "American Motors Cars"
> Magazine (AMC)
> For all AMC enthusiasts
> http://www.amc-mag.com
> (free download available!)
> 
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