Iron head testing (update on post #65)
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achalmersman
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- May 28, 2012
Awesome thread. Subscribed.
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Do you have the test info for the head that achieved 280cfm at .500" with a 1.94 " valve? That's quite a bit more than I've ever seen and I've seen some really good heads over the years including some with larger valves that wouldn't flow that well without a lot of short side work. 240-250cfm seems to be the typical for a really good flowing intake with a 1.94" valve. Also seems like 205cfm is a really good .500" lift number on an iron head with a 1.77" valve. Getting greedy will put you in the water. Champion leaves a good safety net on the short side realizing that chasing after 10-15 cfm will make it that much more prone to break through and won't net more performance in most with 195-198cfm typical.
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i have three benches one analog and two digital........ a 300 600 and a 1200........all superflows........ within their limits each agree very closely.......i don't believe quality benches will show any meaningful differences ................but technique will make lots of differences..........bore size makes a lot of difference.........shrouding from a smaller bore ie 3.8 vs 4.1 can really make a difference.........on intakes attaching a tapered runner makes a lot of difference and it more duplicates how they function in an engine.........
Pronto
Believe nothing you hear and half of what you see.
- Joined
- Dec 9, 2002
Some older info:
http://users.erols.com/srweiss/tablehdc.htm#Buick
http://users.erols.com/srweiss/tablehdc.htm#Buick
turbo96max
Member
- Joined
- Jun 6, 2007
any one know who will flow test heads and relevant expense? kinda on topic.
What exactly are you asking? I would like to keep this thread on topic but maybe your question makes sense. Are you asking cost vs. performance?
My guess 300 @ .500 with his unicorn bone tipped carbide
Mike T
Well-Known Member
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- May 3, 2013
I looked at them briefly a couple of years ago. As I recall they had been ported to the max on the intake side and had tubes pressed in where porting broke through the pushrod holes. I guess it all boils down to casting thickness being the limiting factor........ with enough material to grind you could duplicate the ports of any production style head out there to an extent.
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Mike Licht
I was here first
- Joined
- May 23, 2001
I had a set of iron heads years ago that were 211 on the intake but they had a TON of work including pushrod tubes and welding. With today's port designs I think we could do better without the welding. I have a set being done now that we are going to digitize and offer if they come out as I believe they will. The M&A would normally be 210-220 out of the box, hitting 280 was done a few times on those, since they are the basis for the TA head the numbers make sense they of course made many nice changes.
turbo nasty
Turbo Dojo / MNTR
- Joined
- Jul 19, 2001
Not to further hi jack but if nothing else info for future searches...My TA SI heads flow 247ish on the intake and 211ish on the exhaust. Ported to 1200 sleeved, etc.
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Phoneguy
Cometic HG stress tester
- Joined
- Aug 27, 2002
How in the hell do you have Chris Hogeland port your heads and not give us flow numbers !!!!!
wish we would have flowed mine.
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Bryan
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