quote:Originally posted by George P:
Here's a spec for a custom ground cam from Bullet Cams. Its a tidy little cam with a wide flat torque curve to complement the 4V heads and road racing. With a good exhaust system it should make good use of the Holley intake manifolds top end capability while still retaining some low rpm torque for accelerating out of corners.
Camshaft Spec:
Grinder: Bullet Racing Cams of Olive Branch, Mississippi
Telephone (662) 893-5670
Engine: Ford 351 Cleveland, 4V cylinder heads
Solid flat tappet camshaft
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Intake Lobe: #FF280/371 (CRA, designed for Ford 0.875 tappets)
Intake lobe mathematic centerline = 110° ATDC
Exhaust Lobe: #F292/373 (CRA)
Exhaust lobe mathematic centerline = 114° BTDC
112° lobe separation angle (camshaft degrees)
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Exhaust valve opening = 80° BBDC
Intake valve opening = 30° BTDC
62° overlap
Exhaust valve closing = 32° ATDC
Intake valve closing = 70° ABDC
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280° advertised intake lobe duration
251° intake lobe duration at 0.050"
Intake lobe major intensity = 86
0.620" net intake valve lift (1.73 rocker ratio, 0.022” lash)
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292° advertised exhaust lobe duration
263° exhaust lobe duration at 0.050"
Exhaust lobe major intensity = 94
0.630" net exhaust valve lift (1.73 rocker ratio, 0.019” lash)
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Request to have the custom ground flat tappet cam nitrided (surface hardened) and polished for the best possible durability.
-G
Would you run longer valves or stock length should be ok? If I were to run beehive spring for that cam, and need to achieve 1,900 of assembled height, would stock vavles be long enough?
Thanks for the wealth of information you posted on this board.