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#1
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Head Porting ? - short turn radius template
I'm currently porting the 62 heads from my engine and I'm using the 1.77 sizing valve. According to the Mcarthy video, I ground down a flat spot to shape the valve like the letter "D". However, I'm unclear on the short turn. Both Mcarthy and Jim Hand say to widen the short turn to give a waterfall effect. I want to make sure the pattern is correct. I tried to follow the factory turn the best I could but need to be sure. The video said to use the valve and make a template based on the radius of the valve (assume intake). So do I use the 2.11" intake valve for the radius template or do I use the 1.77? I think it's the 1.77 (sizing valve) but I'm not sure.
Thanks in advance!! |
#2
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Below are a couple of pics somebody posted here a while back that demonstrates the basic idea that you seem to be pondering.
The valve being used to fashion the intake port radius looks to me to be a 2.11" intake valve,thus it stands to reason the radius is more generous than it would be with a smaller valve. But I cant swear to being 100% on this info,I would advise doing a little searching in the archives for more detailed/accurate info. I'll see if I can dig up a link to the thread the pics came from. I've also heard thru some knowledgeable sources that a fella can also make themselves some handy porting templates based off the diagrams inside the old HO racing high performance engine design & blueprint assembly,as those diagrams in the book are supposedly printed to full scale. HTH. |
#3
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Here you go,found it!!!
Link to short turn thread: http://216.178.81.108/forums/showthread.php?t=497961 Should answer a lot of your questions,was a real good thread! |
#4
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Thank you Screamingchief! Figure C on post #8 on that link is what I was needing. I really like how Will calculated push rod buldge guidelines too - very nice link - thanks a ton!!
PS - you going to SAR for the shootout? Edit: Adding http://forums.maxperformanceinc.com/...d.php?t=519939 - for reference to pictures of ports. Last edited by JoePapa; 05-19-2007 at 03:39 PM. |
#5
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Quote:
Gonna be up in Wisconsin spectating at BOP days at great lakes dragaway in Union Grove on June 3rd. then the Hot Rod power-tour is going to be in Racine Wi. (my hometown) June 4th,so I'm likely gonna still be up there that weekend,and if I'm just getting back from that,I doubt I would be inclined to make it to the SAR deal. I would be much more likely to go if I had either of my cars actually running right now... But alas' time and fund$ have my a$$ kicked right now. Just dumb luck I get to go do the Wisconsin trip right now,mostly just costing me gas for the trip,no hotel or such,staying at my brothers place in Racine. Have fun,be safe. |
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