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I've got RHS Pro Action 64cc, 200cc heads on a forged 383 with a comp nitrous cam -CL08-301-8. Looking for a little more HP. Ideas on how much HP I'll gain from a port and polish and port match? Running a Perform RPM manifold. I know I've got room to move on the cam. Looking hard at the Comp XR294-HR. Any experience and comments on that cam would be appreciated. 700R4 with 3,00-3,400 stall.

Thanks all!
 

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Cam currenty installed- Part number CL08-301-8 NX276 HR 224/236 at .050, .502/.52, 113 separation

Cam I'm looking at- XR294HR, Part number 08-443-9, 242/248 at .050, .54/.562, 110 separation
 

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the narrow lobe center will make more mid-range power, higher lift more torque everyehwere.
Use 1.6 rockers if not already, the 383 can use all of it.

Professional port job will gain 20-50 HP depending on how well the heads flow now.
 

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Open up the throats below the intake valves is good for 10 hp at 5,000 RPM. That is usually done with a top notch valve job. Cost is about $100 extra. No flow testing is required if you have it done by a professional with the proper tools.

That will diminish the turbulence of the incoming fuel/air mixture.
 
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