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BBC 427 roller cam

Old 12-17-2020, 09:01 AM
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If itís machined for it I would think it could be drilled and tapped for the thrust plate. Just not certain what timing set youíll need.

Btw just for a comparison on your cam duration my 496ís had 244/248 duration. Installed 4 deg advanced peaked at 5,800 with hyd rollers and at 6,000 with solids. 4.250 stroke.

Something similar to the 731 cam Iíd think.would be a good choice in a 427 to achieve what you want.
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Old 12-17-2020, 09:04 AM
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Originally Posted by getrdunn View Post
If itís machined for it I would think it could be drilled and tapped for the thrust plate. Just not certain what timing set youíll need.

Btw just for a comparison on your cam duration my 496ís had 244/248 duration. Installed 4 deg advanced peaked at 5,800 with hyd rollers and at 6,000 with solids. 4.250 stroke.

Something similar to the 731 cam Iíd think.would be a good choice in a 427 to achieve what you want.
whats the lift ?
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Old 12-17-2020, 10:11 AM
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Lift on the 731 is 587/610. Duration 226/234. Would be a healthy cam in a 427. I didnít catch though are you wanting to stay hyd flat tappet?

Are your heads the 290ís? If so they like 10-12 deg split in duration as many gm heads do.

The 731 should put you very close to peak hp at 6k.
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Old 12-17-2020, 10:30 AM
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Originally Posted by mike tkach View Post
i think the hp500 efi cam would be a good choice,230/236 at .050.598/610 lift 114 lsa.crane cams 169621.with the factory heads and 10.25 to 1 cr i think it will make you smile.i might have one on the shelf,if interested il check.

Another option. Good call Mike, somehow I missed your post.
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Old 12-17-2020, 10:35 AM
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Originally Posted by getrdunn View Post
Lift on the 731 is 587/610. Duration 226/234. Would be a healthy cam in a 427. I didn’t catch though are you wanting to stay hyd flat tappet?

Are your heads the 290’s? If so they like 10-12 deg split in duration as many gm heads do.

The 731 should put you very close to peak hp at 6k.
hydro roller, thats the reason for the thread, my heads are 3931063 1969-71 427 2.06 1.72 Closed 100.9 heads

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Old 12-17-2020, 10:51 AM
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Here;s a Comp cam I found, thoughts.............566/566 Lift 242/248 Duration 112 Lobe Sep.
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Old 12-17-2020, 11:02 AM
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Originally Posted by F-2 Speedy View Post
Here;s a Comp cam I found, thoughts.............566/566 Lift 242/248 Duration 112 Lobe Sep.
Better for sure! those stock closed chamber heads and manifold will restrict (to a point) may not benefit much from a cam that is larger the the above cam.
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Old 12-17-2020, 11:08 AM
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Originally Posted by abones View Post
Better for sure! those stock closed chamber heads and manifold will restrict (to a point) may not benefit much from a cam that is larger the the above cam.
Im not trying to make a bunch more power, the choice of a hydro roller is for ease on the valve train, when engines sit for a long period of time between starts
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Old 12-17-2020, 11:11 AM
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Originally Posted by F-2 Speedy View Post
Im not trying to make a bunch more power, the choice of a hydro roller is for ease on the valve train, when engines sit for a long period of time between starts
I agree, sounds like a good plan!
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Old 12-17-2020, 01:43 PM
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another Com cam, 110 LS
Intake Valve Lift (in.) 0.540
Exhaust Valve Lift (in.) 0.56
Int. Duration @ .050 in. (Deg) 242
Exh. Duration @ .050 in. (Deg) 248
RPM Range 2800-6100
Int. Duration Advertised (Deg) 294
Exh. Duration Advertised (Deg) 300
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