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Working on a pair of 302’s This will be the before porting....
Doesn't look lean to me.
Me either, plug looks good.
Before Home port
Doesn’t look lean? Good to know... wait to I finish butchering these heads with Home porting
Port match, bowl blend and polish the chambers. Good heads and very efficient chambers.
R.I.P 302 cylinder heads. It was nice knowing you. Lol
Just .02. If you don't flow the heads how do you know how to increase the flow numbers? Find someone with a flowbench, flow the heads to get a baseline then make gradual changes.
Ok, that was funny. I agree with getting the heads flowed before and after. Also, I suggest getting at least one or two more heads and practice on the other heads. Grind until you make a hole so you know what it looks and feels like. Learn how you use speed and pressure to get the shape you want. What you use and need may be different that what I use but that doesn't make one right and the other wrong. Work with different sized and shapes of cutters so you learn how each one changes the shape of what you are cutting on. SHAPE IS JUST AS IMPORTANT AS SIZE. Work to get the surface as flat as you can. You don't want a bunch of troughs and stuff on any surface. You'll never learn if you don't do. Keep us posted.
My 273 heads. I didn't do them myself. I practiced on a extra 318 head I had but decided to leave it for the experts. I didn't get them flowed. Not big numbers because of the stock valves but they seem to work well.
Going on a 318?
Not me... I am a bit fat
One head done... not major porting but not minor either... going on my 318.
Mostly chamber port
Before &after mostly chamber in shrouded
contour that valve guide turd. Its like a huge brick in a stream. Its easy and less critical than bowl work. Also when working next to the pushrods, the iron will start to turn colors when it gets very thin so watch that closely unless you got a pair of deep dividers to gauge the thickness. If you pop through, you can drive thinwall copper tubing into pushrod holes and epoxy.