Hello,
Just built a standard 289 to the HiPo standard of the day (65/66) with a comp cam with the specs below. I have an Autolite 1.08 4100, Wieand Stealth intake, repo hip exhaust, single piont distributor recurved to the boss 302 specs, engine bored twenty over.
My question, what can I expect in manifold vacuum? What the the origional 65/66 HiPo's for manifold vacuum.
With the Comp Cam installed, I cannot stay on the idle circuit on the Autolite. I have to open the primary idle a bit. Can this be expected with the cam specs below? Did the original 65/66 HiPo engines stay on the idle circuit?
Thanks for any help in advance.
RPM Range 1500-5500
Lifter TypeHydraulic Flat Tappet
Int. Duration Advertised (Deg) 268
Exh. Duration @ .050 in. (Deg) 218
Exh. Duration Advertised (Deg) 268
Int. Duration @ .050 in. (Deg) 218
Lobe Separation (Deg) 110
Exhaust Valve Lift with Factory Rocker Arm Ratio (0.456
Intake Valve Lift with Factory Rocker Arm Ratio (i0.456
Valve Lift with Factory Rocker Arm Ratio 0.456 int./0.456 exh.
Just built a standard 289 to the HiPo standard of the day (65/66) with a comp cam with the specs below. I have an Autolite 1.08 4100, Wieand Stealth intake, repo hip exhaust, single piont distributor recurved to the boss 302 specs, engine bored twenty over.
My question, what can I expect in manifold vacuum? What the the origional 65/66 HiPo's for manifold vacuum.
With the Comp Cam installed, I cannot stay on the idle circuit on the Autolite. I have to open the primary idle a bit. Can this be expected with the cam specs below? Did the original 65/66 HiPo engines stay on the idle circuit?
Thanks for any help in advance.
RPM Range 1500-5500
Lifter TypeHydraulic Flat Tappet
Int. Duration Advertised (Deg) 268
Exh. Duration @ .050 in. (Deg) 218
Exh. Duration Advertised (Deg) 268
Int. Duration @ .050 in. (Deg) 218
Lobe Separation (Deg) 110
Exhaust Valve Lift with Factory Rocker Arm Ratio (0.456
Intake Valve Lift with Factory Rocker Arm Ratio (i0.456
Valve Lift with Factory Rocker Arm Ratio 0.456 int./0.456 exh.