Swap Meet Score,Heads #3418915 H

If i'm not mistaken the "H" is HP, The "E" is economy, Now thats just a guess, The X/J conversion happened around the latter part of 1970 when the 360 was introduced for the 71 model yr., The X head had the 2.02 valves, The J had the 1.88 (for the most), but its very possible some of the 1st. runs of the Js had the 2.02 valves but never made it on the 360s, it was still a 340 head with the 2.02s, I'm sure the X head was gone in 71 replaced by the J which was the primary heads installed on the 340/360, they shared the same casting from 71-73, so its very possible those "H" Js have 2.02 valves & were early J production, If they did exist they are VERY rare.

I like the J heads, there no different IMO then the X heads other then the smaller Intake valves, Compared to as an example a set of RHS heads, the RHSs will blow them out of the water "stock" for "stock".