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Location:
Adelaide
Registered:
May 2003
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Porting & Polishing 4A Heads
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Wed, 03 March 2004 00:21
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As this is my first time doing anything so adventurous on the 4A i thought i would ask some advice.
I have read not to increase the smallport size too much as it reduces airflow. But i was thinking of enlarging it just slightly, maybe 2-3mm in overall radius, so 6ishmm in dia. Is this acceptable, will it make any difference? Or should i just clean up the flashing
Also i havnt figured out squash areas yet, and as i am considering having the head shaved slightly for an increase in compression im not sure what will need to be done there. Anyone for assistance there?
Im only aiming at about 150-160hp from the smallport. 264 cams, underdrive pulley and higher compression should garner this for me i think.
Opinions? Advice?
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