This is the most information I've ever seen in one place about head flow for the small and big block Chevy motors.....
http://racingfeed.com/downloads/chevy_flow_data.pdf
Printable View
This is the most information I've ever seen in one place about head flow for the small and big block Chevy motors.....
http://racingfeed.com/downloads/chevy_flow_data.pdf
thanks this helps me out a lot
Thanks, I guess my 462 heads dont look so bad after all. Especially with the 2.02's installed.
Those numbers are from Stan Weiss,he also shows other head flow numbers from Ford,Mopar etc.Quote:
Originally Posted by techinspector1
I having trouble interpreting the chart.
Would someone please explain the values in columns ".100, .200 . . . Average"? **)
The green percentage must be the resulting volumetric efficiency?
0.100" valve lift, 0.200" valve lift, etc. Using 0.400" valve lift to compare different heads will be the best comparison for a street motor.
Green is percentage of exhaust flow compared to intake flow.
Man, the new Dart Iron Eagle platinum's have really improved over the older versions! They might actually be worth buying a set now.
I'm going to get a beating now:
Flow isn't everything.
You have to check the chamber shape, CR, size and shape of the intake runners... I would never get a head only based on the flow-numbers, otherwise everyone would run 882's :rolleyes:
But the chart is very helpful, I like my 492's even better now that I KNOW they're good :LOL:
Thanks a lot Tech,
Max
True, but I don't think there's any aftermarket head with as bad of a chamber as an 882 or any other smog era head.
Whats your best guess on how much flow increase I'll see by having installed the 2.02/1.70's in my 462 heads? :)
You need to look at flow numbers in the middle,not at .100 or .500 but in the .200 to .400 area depending on you camshaft profile.Quote:
Originally Posted by MadMax
Your valves spend very little time at min. lift or max. lift.