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Jim Brierley · 07-02-2018, 12:17 PM

There were 3 different profiles put on B cams by Ford. The most common has .305" of cam-lift. The latest one (I think the latest) had .339" cam lift. All idled nicely, the .339 cam had more mid and higher speed power than the earlier one. A touring cam can be anything, but generally have more lift and more duration (more time with the valve off its seat) than the stock cam. Too much duration can actually hurt low-speed performance. So to answer your question, sounds like a stock A or B cam would be best for you. The combination of parts must work together as a team to produce the power you want. Cam, compression and carburetor size determine that. Racers, hill-climbers, etc. use a "hotter" cam, higher compression and a bigger or multiple carbs, with some sacrifice of power at low speeds but much more at mid and high speeds. 100 horsepower is easily attainable on a Model A engine.

07-02-2018, 12:17 PM	#3
Jim Brierley Senior Member Join Date: Jun 2010 Location: Temecula, CA Posts: 4,088	Re: Just what is a touring cam There were 3 different profiles put on B cams by Ford. The most common has .305" of cam-lift. The latest one (I think the latest) had .339" cam lift. All idled nicely, the .339 cam had more mid and higher speed power than the earlier one. A touring cam can be anything, but generally have more lift and more duration (more time with the valve off its seat) than the stock cam. Too much duration can actually hurt low-speed performance. So to answer your question, sounds like a stock A or B cam would be best for you. The combination of parts must work together as a team to produce the power you want. Cam, compression and carburetor size determine that. Racers, hill-climbers, etc. use a "hotter" cam, higher compression and a bigger or multiple carbs, with some sacrifice of power at low speeds but much more at mid and high speeds. 100 horsepower is easily attainable on a Model A engine.