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Head porting..what to avoid.. 120-130

posted by  someone claiming to be B20Paul. on  Sun May 25 17:44 CST 2008 [RELATED]

Click here for some fuzzy pics.

This exhaust port flows 133cfm@28"H20 with 35mm B20E valves. This is as much as a standard B18 inlet.

Take no metal away from the LSR between the seat & guide. Take metal away on the roof the other (outside) of the guide. Use as large as possible radius on the SSR.

Get hardened (stelite) seats installed before you start porting, standard angles are good, I'd try a 15 degree cut on the exhaust only: 15/30/45/60

Just 3 angles on the inlet with a 30 degree top cut on the valve.





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