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oldman · 10-29-2023, 10:02 PM

I think the LT1 and LT4 both have plain exhaust valves, I think for FI and E85 Manley stainless steel, or Manley Inconel would be my two choices. I've run Manley since dunno the 70s?? I like their slight undercut head design for flow and they are straight and true out of the box, not many other brands of "performance" valves. I've seen many destroyed OEM valves, so IMO they are not "good enough", when you are talking about doubling the OEM HP levels and toss in some high lift cam / high ramp speed.. Sorry I would only go Manley, like their boost line con rods too.... um. sweet.

https://www.manleyperformance.com/wp.../08/valves.pdf

10-29-2023, 10:02 PM	#19
oldman Drives: SS 6 speed of course Join Date: Jan 2016 Location: Hilo, HI Posts: 4,346	I think the LT1 and LT4 both have plain exhaust valves, I think for FI and E85 Manley stainless steel, or Manley Inconel would be my two choices. I've run Manley since dunno the 70s?? I like their slight undercut head design for flow and they are straight and true out of the box, not many other brands of "performance" valves. I've seen many destroyed OEM valves, so IMO they are not "good enough", when you are talking about doubling the OEM HP levels and toss in some high lift cam / high ramp speed.. Sorry I would only go Manley, like their boost line con rods too.... um. sweet. https://www.manleyperformance.com/wp.../08/valves.pdf __________________ 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.