Reply to "Bullet Cobra Jet Cam"

Hi Rich.

That gentleman installed the single pattern version.

That spec uses a really "hot" cam lobe. And it shows.

One reason that cam worked for that particular application was because the car was fitted with a very good exhaust system. When the exhaust system has not been so good, I've used that same lobe on the intake with a longer duration lobe on the exhaust. Making what I feel is one of the best overall hydraulic flat tappet street performance cams ever.

check it out:

• Hydraulic Flat Tappet
• Advertised duration (at 0.006 tappet lift) = 277°/287°
• Duration at 0.050 inch tappet lift = 228°/235°
• Gross valve lift at 1.73:1 rocker arm ratio = 0.580/0.585
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• ICL = 111° ATDC .............| An earlier ICL synchronizes air flow capability more closely with air flow demand and makes more power.
• LSA = 114° .....................| A wider LSA reduces overlap, produces a wider and flatter torque curve, and improves controllability.
• Seated Overlap = 54° .......| Limiting overlap to 60° or less improves vacuum, idle, low rpm torque and drivability.
• Seated EVO = 80.5° BBDC | An earlier EVO compensates for a muffled exhaust, improves idle, extends high rpm power.
• Seated IVO = 27.5° BTDC | Limiting the IVO to 30° or less improves vacuum, idle, low rpm torque and drivability.
• Seated IVC = 69.5° ABDC | A later IVC lowers the DCR, requires a higher SCR; and can lead to reversion at idle.