The motor has always had a bad rep, probably because it was the motor that AMF bought when it bought the company in 1974. So, I have recently started researching the pros and cons of a primary belt drive conversion for my 1972 Harley Davidson Shovelhead. ? My Indy has a Panhead motor in a shovel frame in his shop right now.. Looks really nice. Thanks, are there different size spigots between say a 1964 and the 1952 ? Geo. hotsos. 04-22-2014, 03:44 PM. Hi, I have an interest in building a Harley and I am trying to decide if I should go with a Shovelhead or an Evo engine. Check the diameter of the exhaust spigot on your head - stock diameter on a pan is 2.06". When the engine was first produced, the Shovelhead had a shallower combustion chamber, larger valve drop for both intake and exhaust, better porting, and stronger valves and pistons. Bike's getting a total engine overhaul.. The FLH was the top selling model in 1966 and listing at $1610 for the top of the line "king of the highway" option (over $300 less than what Elvis was said to have paid). The Shovelhead essentially was an improved version of the Panhead. As you know, the Shovelhead project is a big deal for me and is featured a lot here on HappyWrench. Thus it was that the new Harley-Davidson Shovelhead engine was more an effort to solve the unsolved problems of the Knucklehead than it was to start with a clean sheet of paper. The Shovelhead was the third rendition of Harley’s OHV V-twin, following the Knucklehead and the Panhead. Also the rocker bearings on the Pan were notorious for wearing out due to poor oiling up top. Shovelhead has a flange with one bolt hole in it. 1966-1984. At its bottom end the Shovelhead engine design is the same as both the Knucklehead and Panhead that preceded it. The intake ports on the Shovelhead are angled for better flow and the Shovelhead had better valve seats. Hidden Virtues of the Shovelhead Motor. A Pan head was produced from the late '40s to mid-'60s. The Shovelhead had about 10 hp more than the Panhead from the factory. The Shovelhead engine is a motorcycle engine that was produced by Harley-Davidson from 1966 to 1984, built as a successor to the previous Panhead engine. The top of the rockerboxes resemble the curve of a shovel, hence the name. Panhead (1948-1965) vs. Shovelhead (1965-1983) Photo courtesy Working Class Zeroes. But is the bad reputation of the shovelhead deserved? The Shovelhead was designed in part to produce more power and higher performance to make up for the increased weight of new Harley-Davidson motorcycle models. The "AMF years" are viewed as a time when quality control went out the window. The head pipe in your pic is definitely panhead. The HD Shovelhead motor went out of production in 1984. The Shovel head (no idea where that name came from) had a rocker box which looked like a Sportster rocker box, rather 'C' shaped, with the vertical part of the 'C' on the RH side of the head. The 1966 Electra Glide shed its Panhead in favor of the Shovelhead to become the first Shovelhead-powered Harley. Bike had 68 miles on the motor before sandblasting sand, left in the oil tank, was sucked into the motor, destroying it, internally. Early Shovelheads kept the lower style of the Panhead engine but bolted on a new top end. The Pan head, again, used on 61 ci and 74 ci engines, had a 'Pan', upside down on top of the head, cover the valve assembly and rocker arms. I have tools and have been wrenching on everything from trucks to tractors, snowmobiles, and dirt bikes since I was 12 (now 26). I have been reading that the Shovelhead takes a lot more maintenance and is more likely to break down than the Evo. - Harley-Davidson Shovelhead. 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