Howards Flat Tappet (hydraulic)

[wrobinson]

Please give me some feedback on the camshaft I have selected. The engine is a 1973 4V 351C with 9:1 compression, headers, and aftermarket dual plane intake. The car has 3.25 gearing and C6 with 2200 stall.

The camshaft specs:

220/220 @ .050, 267/267 advertised duration

586/586 lift with 1.73 rockers

110 lobe separation

106 intake centerline

 

[73pony]

OK I guess. Depends on how you want the car to perform.

See link.

https://www.7173mustangs.com/thread-engine-and-compression-calculations?highlight=compression

This cam puts your Dynamic compression right at 7.49, so right at the minimum you want.

Duration seems low, but any more reduces your dynamic compression.

 

[wrobinson]

73pony,

The duration is low because I want to keep the factory A/C and vacuum accessories. I can get the same cam ground with a 108 lobe separation and 104 intake centerline but the accessories will starve for vacuum.

 

[4Vforever]

I really like the range from Howard's and have been using and recommending them lately for quite a few builds. That cam you've put up is not what I'd be using in a 4V as the needs more duration and lift on exhaust side to help with the poor exhaust port. Personally I like this cam and have recommended it in one build and going into another engine in the coming weekend. This is what I'd be looking more at or along similar lines   http://howardscams.com/i-24079591-howards-cams-cl230041-12-street-force-3-1970-1983-ford-351c-351m-400-hydraulic-flat-tappet-2200-to-5800-camshaft-lifter-kit.html