First day with my new die grinder (porting heads)
#1
First day with my new die grinder (porting heads)
Spent a couple of hours on some 241 heads yesterday. Theyre far from finished, but I wanted some feedback thus far to help coach me along. So far ive done the valveguides on the intake and exhaust, ive D shaped the exhaust runner, and ive smoothed out the intake runner. The runner was widened about .030 on each side, but blending down to the stock casting which was only smoothed. the roof was raised also about .030 and smoothed down. I havnt done any work to the valve bowls or blended the seats yet, but thats the next plan of action. Ill go over the whole thing to smooth out any imperfections that are still there after i finish the bowls and seats. What looks like it need more work?
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Looks like you are moving right along. Be careful of your width on the exhaust side. Appeared the you are getting kinda wide on one side. Try and keep your port centered and dont get any wider than about 1.58" Take your intake throat diameter down to the valve guide and be sure and widen the runner into the bottom of the short turn. That will help you higher lift.
Brandon
Brandon
#4
Originally Posted by xfactor_pitbulls
Looks like you are moving right along. Be careful of your width on the exhaust side. Appeared the you are getting kinda wide on one side. Try and keep your port centered and dont get any wider than about 1.58" Take your intake throat diameter down to the valve guide and be sure and widen the runner into the bottom of the short turn. That will help you higher lift.
Brandon
Brandon
#5
Originally Posted by ss rally red
Hey that set of heads look like some I have seen before ,good luck with your project!
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I didnt think of it at the time but I coulda roughed in an intake and exhaust port on the practice heads you got to help guide ya along . Ohwell, looks like your doin it on your own just fine, just blend everything into each other and things should be good.
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Originally Posted by GuitsBoy
My guess is that the gasket wasnt centered as the carbon buildup was off center. I really didnt hog out much material from the sides, just enough to get through the black carbon buildup and then clean up the casting. I dont have a set of calipers on me right now, but ill see how close i am to 1.58. What should i do behind the intake and exhaust valveguides, leave them flat? Thanks for the help!
Brandon
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Originally Posted by xfactor_pitbulls
Looks like you are moving right along. Be careful of your width on the exhaust side. Appeared the you are getting kinda wide on one side. Try and keep your port centered and dont get any wider than about 1.58" Take your intake throat diameter down to the valve guide and be sure and widen the runner into the bottom of the short turn. That will help you higher lift.
Brandon
Brandon
Do those measurements apply to 243's too?
Thanks!
#11
Originally Posted by Bo White
I didnt think of it at the time but I coulda roughed in an intake and exhaust port on the practice heads you got to help guide ya along . Ohwell, looks like your doin it on your own just fine, just blend everything into each other and things should be good.
Last edited by GuitsBoy; 12-12-2005 at 03:25 PM.
#13
Originally Posted by GuitsBoy
Spent a couple of hours on some 241 heads yesterday. Theyre far from finished, but I wanted some feedback thus far to help coach me along. So far ive done the valveguides on the intake and exhaust, ive D shaped the exhaust runner, and ive smoothed out the intake runner. The runner was widened about .030 on each side, but blending down to the stock casting which was only smoothed. the roof was raised also about .030 and smoothed down. I havnt done any work to the valve bowls or blended the seats yet, but thats the next plan of action. Ill go over the whole thing to smooth out any imperfections that are still there after i finish the bowls and seats. What looks like it need more work?
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When i done mine i was told to remove the little bump on the up right hand corner,That were the rocker bolt threaded hole protrudes into the intake runner ,When you die grind it out it will make a hole there but dont worry it not the water jacket. I just put a little silicone on the rocker bolt so no oil will get into the intake runner
#17
Originally Posted by GuitsBoy
Trying to show me up in my own thread, huh?!? j/k
Looking Good CBX. How did you gauge the bowl work?
Looking Good CBX. How did you gauge the bowl work?
#18
Originally Posted by CBX
By eye, I just blended the intake walls into the valve seats while staying below the valve contact area.
Im thinking about just eyeballing it flush with the inner part of the seat down vertically and fading into the bottom of the bowl. Not quite sure how im going to pick off behind the valve guide yet. Guess ill just use the ball carbide burr.