cam question
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
You do not need a lot of porting work. The intake ports are OK with only flashing removal and bowl work.
The exhuast ports shold have the bumps removed and polished as best you can. The elbow bend needs to be straightened a little.
You never polish an intake port. The rough surface helps keep the fuel from sticking to the surface, and in the mixture.
You don't need to make the ports larger, just reduce the restrictions.
The exhuast ports shold have the bumps removed and polished as best you can. The elbow bend needs to be straightened a little.
You never polish an intake port. The rough surface helps keep the fuel from sticking to the surface, and in the mixture.
You don't need to make the ports larger, just reduce the restrictions.
Posting Guru
Joined: Dec 2002
Posts: 2,003
Likes: 2
From: chicago burbs
SUM-K5200
Basic Operating RPM Range: 1,500-4,000 RPM
Duration at 050 inch Lift: 204 / 214
Advertised Duration: 262 / 272
Valve Lift with Factory Rocker Arm Ratio: 0.484 / 0.510
Lobe Separation (degrees): 112
Grind Number FC 255DEH-10 / PN 32-206-3
Duration At 0.05 203 / 216
Duration At 0.006 Tappet Lift 255 / 263
Gross Valve Lift 0.469 / 0.505
Lobe Separation 110
Basic Operating RPM Range: 1,500-4,000 RPM
Duration at 050 inch Lift: 204 / 214
Advertised Duration: 262 / 272
Valve Lift with Factory Rocker Arm Ratio: 0.484 / 0.510
Lobe Separation (degrees): 112
Grind Number FC 255DEH-10 / PN 32-206-3
Duration At 0.05 203 / 216
Duration At 0.006 Tappet Lift 255 / 263
Gross Valve Lift 0.469 / 0.505
Lobe Separation 110
Last edited by grclark351; Aug 18, 2005 at 05:28 PM.
