- Hydraulic Flat Tappet TRW Camshaft
- Advertised duration at 0.006 valve lift = 282°/292°
- Duration at 0.050 inch tappet lift = 204°/214°
- Gross valve lift at 1.73:1 rocker arm ratio = 0.484/0.510
TRW was playing mind-games with the advertised duration. They've specified the duration at 0.006 valve lift, which is equivalent to 0.0035 tappet lift. I recognize the exhaust lobe spec. It was used as the intake lobe in the SVO A341 cam. Suffice it to say this cam's true advertised duration is about 270°/280°. The figures below are based on my estimate:
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- ICL = 107° ATDC
- LSA = 112°
- Seated Overlap = estimate 51°
- Seated EVO = estimate 77° BBDC
- Seated IVO = estimate 28° BTDC .
- Seated IVC = estimate 62° ABDC.
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This is a short duration cam with typical 1980s lobe centers. The overlap is good for a street cam. Limiting the IVO to 30° or less improves vacuum, idle, low rpm torque and drivability. The intake valve closes early, which would help build dynamic compression in a 1972 Cobra Jet which only had 8.6:1 static compression.
Good choice.