Pray Performance head porting results (dyno) - Page 2

6spdhyperblue · 05-19-2023, 05:30 PM

Do you know if a katech port job would produce similar results

NA18CamaroSS · 05-22-2023, 10:58 AM

Quote:

Originally Posted by 6spdhyperblue

Do you know if a katech port job would produce similar results

I don't know. Brett has posted his flow charts a couple of times. You could compare Katechs flow #s and see. Flow bench numbers will give you a pretty good idea of how the two heads will stack up against each other.

Blackmonba6Gen · 05-22-2023, 07:37 PM

Quote:

Originally Posted by NA18CamaroSS

I don't know. Brett has posted his flow charts a couple of times. You could compare Katechs flow #s and see. Flow bench numbers will give you a pretty good idea of how the two heads will stack up against each other.

They look pretty similar but here is Katech. I have these on mines and they flow pretty good.
https://katechengines.com/i-30498128...der-heads.html

s346k · 05-22-2023, 07:40 PM

i wonder what caused the valve train failure on the pray ported head. something aside from the normal abuse seen by the na sbe crowd?

savyomix · 10-18-2023, 09:55 PM

Quote:

Originally Posted by Sillysspeed

Are the stock lt1 valves hollow stem or standard stainless steel valves. Good gains btw

I believe they're hollow which is also why it's common for people who put Aftermarket cams with a higher RPM range drop oem valves since heat and hollow spaces dont really mix well together.

oldman · 10-19-2023, 03:13 PM

I love Pray's stuff, I will go to a High Ram on my next engine. I went to Manley ProFlows with undercut head on my cam change, and there was a noticeable improvement of midrange and top end, granted it was two changes (cam and undercut valves); that said the 2nd cam had lower lift and gentler ramps but longer duration so it was expected to produce about the same HP as my .660 lift cam but last longer and have a stronger loop.

05-19-2023, 05:30 PM	#15
6spdhyperblue Drives: 6th gen Join Date: Aug 2013 Location: US Posts: 3,678	Do you know if a katech port job would produce similar results __________________ ‘22 2SS 1LE M6 Summit White - RF, Flexfuel, LT2 intake, 95mm tb, ATI udp, VT ramair, full 28” dragpack - 11.68@122 ‘16 1SS M6 LT2 intake + boltons on DR 11.0@126+ (Sold)

05-22-2023, 07:40 PM	#18
s346k Drives: like an old lady Join Date: Jun 2012 Location: indiana Posts: 2,396	i wonder what caused the valve train failure on the pray ported head. something aside from the normal abuse seen by the na sbe crowd? __________________ 2016+ camaro: everyone’s first car

10-19-2023, 03:13 PM	#20
oldman Drives: SS 6 speed of course Join Date: Jan 2016 Location: Hilo, HI Posts: 4,320	I love Pray's stuff, I will go to a High Ram on my next engine. I went to Manley ProFlows with undercut head on my cam change, and there was a noticeable improvement of midrange and top end, granted it was two changes (cam and undercut valves); that said the 2nd cam had lower lift and gentler ramps but longer duration so it was expected to produce about the same HP as my .660 lift cam but last longer and have a stronger loop. __________________ 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.

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