Jun 5, 2011 update on P71's 1973 AMC Javelin

6090!!!

update image

The 6090 (last 4 before the dash) heads are the second-best AMC casting after the 6291’s. They feature the dog-leg exhaust ports that flow more, big 2.025/1.680 valves, and the early style single adjustable rockers with a 57.92cc chamber. This means I can use aftermarket rocker arms (the later heads use a net-lash bridged rocker), and the heads themselves are totally worth keeping. With a few changes to the engine (cam, rockers, intake manifold, carburetor, ignition, and headers) these heads are capable of close to 400HP and 475FtLbs stock! This also confirms that this is the original engine, as the 73 360 4-barrel is the only engine to get them. My car is “matching numbers”.

 

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