head porting ?
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Senior User
Joined: Mar 2005
Posts: 135
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From: indiana
head porting ?
im porting my 390 heads as of now and i have a question. Ive heard different opinions on porting the intake ports in the head. Some say to polish up and some say don't so it will cause the fuel to spin????
Laughing Gas
Joined: Nov 2000
Posts: 1,072
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From: tulsa
do not polish smooth the intake side, the roughtness helps atomize and mix fuel with the air, but the exaust side can be smooth. also a good idea is th smooth out the top side of the head so oil can flow back to the pan better.
Elder User
Joined: Jun 2001
Posts: 508
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From: Corpus Christi, Texas
on your exhaust port concentrate on the top side of the port. The way the exhaust will flow is up throught the valve and hit the top side of the port. So this is were I did alot of my polishing and porting. The intake I kinda concentrated on the bottom side since the air flows down through the port... But leave the roughness in the intake side
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Christian
335 Series- 5.8/351M, 6.6/400, 351 Cleveland
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Jun 6, 2002 12:59 AM
