OOPS, that's what I get for glancing quickly without verifyingMaybe you are missing that there is 2 cc 's between the lines? There is 48cc left in the metering glass.
I was but, that was about 45 years agoYour're not a bartender I hope...
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
OOPS, that's what I get for glancing quickly without verifyingMaybe you are missing that there is 2 cc 's between the lines? There is 48cc left in the metering glass.
I was but, that was about 45 years agoYour're not a bartender I hope...
For anyone planning on porting Swirlers...
This guy is going absolutely Crazy on a 193 head.
And its ongoing. Right now he has a 2.15" intake Valve in it, 50 degree valve seat, Combustion chamber opened up to 4.125 bore, the port is at 230cc and it is flowing 280cfm at 0.500
that is ABSOLUTELY bonkers and it makes absolutely no sense, but he is aware of this and doing it anyway just for fun and as a learning experience I guess. What´s good about it is that he does not hide his mistakes. For the average shade tree porter it is as much about what not to do as it is about what can be done.
Enjoy:
This is before it goes crazy and also how far I would go. Stock size valves (with back cut inlet valve) flows 235cfm at 0.500 which I believe is similar to or maybe even slightly better than untouched Vortecs. (Vortecs do on the other hand often work better than their flow numbers indicate)
The 193´s in the Video still has some potential for improvement with a better valve job
xc_hide_links_from_guests_guests_error_hide_media
Thats some great info right there, thanksI have long known that a TBI head can flow close to what an untouched Vortec can. The ones I cleaned up with minimal knowledge back in the day flowed 224 cfm @ 0.500. The Canadian 906s flowed 242 cfm @ 0.500 and the Mexican 062s flowed 215 cfm @ 0.400 on the same bench. My stock 810s flowed 178 cfm @ 0.400. I also ported a set of 601s (80s LE9 305 truck heads) and put PEP Pro Valves in them that were undercut stems. Those flowed 226 cfm @ 0.500 through a 1.84 valve keeping ~52cc chambers after 0.020" was taken off them.
Yes and low lift flow is important because the valve will spend way more time at "low" lift than it does at maximum lift. (Obviously you know this already, but others might not)One of the "secrets" of the Vortec port and valve is that the low-lift flow is outstanding.
The chamber is also very efficient at burning.