Quote:
Originally Posted by Chris Haynes
For street use is there a noticeable improvement by porting and bigger valves?
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Before porting and enlarging the intake valves, compare the intake ports on your new engine to the intake ports on a stock Model A engine.
Your new engine has larger intake ports that have a more streamlined path to the valve.
If you modify the ports, keep in mind that the water jacket has a nominal wall thickness of 5/32 inch.