cam for 351m
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cam for 351m
Hello all I have a question which cam would best a Crane 266 H10 or 272 H10 my cruise is 2500 most of my driving is city and highway at 50-75. Everything is stock 1977 F150 2wd C6 with B&M shiftkit and 350 gears. I am installing headers and maybe a manfold
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Joined: Aug 2000
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From: (near) Denver USA
cam for 351m
adobbs,
I don't think either of those would be a good cam for the 351M.
All 335 series (351C/351M/400) engines came from the factory with a dual-pattern cam, which has different profiles on the intake and exhaust lobes. In my experience, the M-block (351M/400) likes a dual-pattern cam much better than a single-pattern cam, such as the Crane cams you mentioned. In an M-block engine, single-pattern cams force a trade off between either too much intake duration at low rpm (poor idle and vacuum) or not enough exhaust duration at mid-range and higher rpm (severly limiting the power). I've met a lot of M-block owners who were disappointed with the performance from their single-pattern cams.
If your plans are for a 4V carb/manifold and headers, I suggest you consider something like the OEM camshaft for a 351C 4V engine. Crane offers a blueprint cam for the 1972 266 hp 351C (#D2ZE-6250-A), with 206/220 @ 0.050", 0.481"/0.490" gross lift, and 115 degrees lobe separation. The exhaust duration is a little radical for the 351M (which has better exhaust ports than the 4V Cleveland head), but otherwise, it looks like a decent cam.
Another decent cam is the Comp 255DEH, with 203/216 @ 0.050", 0.465"/0.495" gross lift, and 110 degrees lobe separation.
I think either of those cams would be better than the cams you mentioned.
BubbaF250
1980 F250 4x4 Custom, 351M/NP435/NP208/D44HD-TTB/D60-FF/3.55s 6750 GVW, Rust & White.
I don't think either of those would be a good cam for the 351M.
All 335 series (351C/351M/400) engines came from the factory with a dual-pattern cam, which has different profiles on the intake and exhaust lobes. In my experience, the M-block (351M/400) likes a dual-pattern cam much better than a single-pattern cam, such as the Crane cams you mentioned. In an M-block engine, single-pattern cams force a trade off between either too much intake duration at low rpm (poor idle and vacuum) or not enough exhaust duration at mid-range and higher rpm (severly limiting the power). I've met a lot of M-block owners who were disappointed with the performance from their single-pattern cams.
If your plans are for a 4V carb/manifold and headers, I suggest you consider something like the OEM camshaft for a 351C 4V engine. Crane offers a blueprint cam for the 1972 266 hp 351C (#D2ZE-6250-A), with 206/220 @ 0.050", 0.481"/0.490" gross lift, and 115 degrees lobe separation. The exhaust duration is a little radical for the 351M (which has better exhaust ports than the 4V Cleveland head), but otherwise, it looks like a decent cam.
Another decent cam is the Comp 255DEH, with 203/216 @ 0.050", 0.465"/0.495" gross lift, and 110 degrees lobe separation.
I think either of those cams would be better than the cams you mentioned.
BubbaF250
1980 F250 4x4 Custom, 351M/NP435/NP208/D44HD-TTB/D60-FF/3.55s 6750 GVW, Rust & White.
Lead Driver
Joined: Nov 2000
Posts: 6,639
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From: Albuquerque
cam for 351m
Dual pattern good!
Lots of initial advance good!
Headers good!
I wouldn't get too carried away with duration on the bump stick. Stock compression doesn't support it well. 650 Holley and performer intake would work well.
1977 Ford F-100
400m/c6
280,000 miles
Stock on the outside
modified/rebuilt everything
Lots of initial advance good!
Headers good!
I wouldn't get too carried away with duration on the bump stick. Stock compression doesn't support it well. 650 Holley and performer intake would work well.
1977 Ford F-100
400m/c6
280,000 miles
Stock on the outside
modified/rebuilt everything
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Junior User
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cam for 351m
Thanks for the info every one got my headers today. But I am installing a tilt wheel and cruise controal a friend sold it to me for 25.00 every thing form 79 Bronco also intermitted wipers . Now have all most every opt Ford offerd from 73 to 80
