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Old 06-02-2003, 03:51 PM
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Post Question about porting heads.

Ok ive got some 305 junk heads ive been praticing on after reading up about it. The 1 question i have is this. Inside the intake and exhaust holes on the side of the head, 1 side wall of those is kind of curved. Do i need to keep that curve when i am grinding or just grind it straight back inside the head? i hope this makes sense, thanks all

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Old 06-02-2003, 05:39 PM
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I would follow the curve to retain the wall thickness evenly (might find water if you go just straight)... The main consideration for exhaust porting is to leave the bottom of the port flat (do not round it out...) Hog out the rest but beware...

A good way to start if you have several "junk" heads is to take and slice them in various places (center of the ports) with a porta-band to get an idea of the passages and thickness... I mean across from intake to exhaust...
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Old 06-03-2003, 01:47 AM
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i laid the old gasket on the ports and sprayed with primer , and matched back to the gasket all the way around (gasket matching??). my ports are dead square,with no thicknesses outside the gasket match.i didnt hit any water, but i never tried them out yet. they wont squirt, but they may have needed that for support though.i plan on finding out the hard way as i didnt have spare heads.mike
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Old 06-03-2003, 04:33 AM
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NOT to sound mean or anything but in your last post some good advice and sites were given. The sites also showed pictured sections of your questions. Also use some old valve's when polishing the quench area so you don't hit the seats.
<a href="http://www.sa-motorsports.com/diyport.htm" target="_blank">http://www.sa-motorsports.com/diyport.htm</a>

[ June 03, 2003: Message edited by: 1BAD80 ]</p>
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Old 06-03-2003, 07:13 AM
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Your right some great advice was given, if my questionw as answered on there im sorry. But i do appreciate all the replies.
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Old 06-03-2003, 02:56 PM
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Just trying to help you out. The site has a lot of info that you mite not think of while doing your head's.
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