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oldman · 02-18-2020, 08:21 AM

from memory the ported stock IM and TB run out of flow at .400 lift, 30 cfm from memory at .500 lift, this was on a ported head. Pray has a post on it. Basically you can take the cfm of the port and double it and that would give you the NA HP the engine will / can make.
https://www.camaro6.com/forums/showthread.php?t=483048
Note that Pray's ported TB flow more air than the hole...

02-18-2020, 08:21 AM	#39
oldman Drives: SS 6 speed of course Join Date: Jan 2016 Location: Hilo, HI Posts: 4,346	from memory the ported stock IM and TB run out of flow at .400 lift, 30 cfm from memory at .500 lift, this was on a ported head. Pray has a post on it. Basically you can take the cfm of the port and double it and that would give you the NA HP the engine will / can make. https://www.camaro6.com/forums/showthread.php?t=483048 Note that Pray's ported TB flow more air than the hole... __________________ Forged short block, large duration sub .600 lift Cam Motion cam, 7200 RPM fuel cut, Pray Ported Heads, 3.85 pulley D1X, stage II intercooler, DSX secondary low side, DSX E85 sensor, Lingenfelter big bore 2.0 pump, ported front cats, 60608 Borla, LT4 injectors, ZL1 1LE driveshaft and Katech ported TB, ported MSD intake, BTR valvetrain, ARP studs, ProFlow valves, PS4 tires.