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What are you trying to accomplish here? Are you building a race engine? From what I have read and discussed with people who do cylinder head porting, 90% of power improvement is within one inch of the valve.

I have not seen dyno numbers for simple port matching for an M10 engine, perhaps someone else has insight here. While intake port matching is good for flow, you do not want to port match the exhaust ports. The header should be slightly larger than the port, as the step change inhibits exhaust reversion.

Before you go off porting things read this excellent book:

How to Port & Flow Test Cylinder Heads

by David Vizard

published by SA Design, Feb 15, 2012

You can Google David Vizard, he has a number of excellent articles on the web.

Here's another good book:

Engine Airflow - A Practical Guide to Airflow Theory, Parts Testing, Flow Bench Testing and Analyzing Data to Increase Performance for Any Street or Racing Engine

by Harold Bettes

published by HP Books, July 6, 2010

Fred '74tii & '69


'74tii (Colorado) track car

'69ti (Black/Red/Yellow) rolling resto track car

'73tii (Fjord....RIP)

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the 2002 intake is pretty fantastic for 1964.

Checking your port matching's never a bad idea,

but it MIGHT make you a horsepower at 4800.

Until you're into real numbers (150+) the head's not

the weak point of the 2002 engine.


"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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