CAMARO6 - View Single Post - Low budget high hp motor build? I BROKE IT!

oldman · 08-12-2019, 10:19 PM

I'd check for telltale contact marks in the valve relief area on all the other 7 pistons.

My tuner is saying that the ramp profile of my cam is partially responsible for my lifter failure. Whatever cam I'm going to, it will have less lift, and a smoother ramp, especially on the deceleration.

Last you can check the comp cams conical spring white paper and note that dual springs can have some funky oscillation leading to very low spring pressure at certain harmonics and high lifts. The problem I have with the conical springs is all of them have some serious lbs / inch. I don't know if I want to run that on a street car. Don't see any problem in a race car.

I'd look at this cam:http://www.cammotion.com/gen-5-lt-ca...-5-vvt-delete/

and spec at .600 to .612 lift. Supposedly cam motion and BTR have better valvetrain stability in their profile

Texas Speed does have a good price on a darton sleeved short block. I think Pray is a vendor. They are just north of Austin.

08-12-2019, 10:19 PM	#55
oldman Drives: SS 6 speed of course Join Date: Jan 2016 Location: Hilo, HI Posts: 4,346	I'd check for telltale contact marks in the valve relief area on all the other 7 pistons. My tuner is saying that the ramp profile of my cam is partially responsible for my lifter failure. Whatever cam I'm going to, it will have less lift, and a smoother ramp, especially on the deceleration. Last you can check the comp cams conical spring white paper and note that dual springs can have some funky oscillation leading to very low spring pressure at certain harmonics and high lifts. The problem I have with the conical springs is all of them have some serious lbs / inch. I don't know if I want to run that on a street car. Don't see any problem in a race car. I'd look at this cam:http://www.cammotion.com/gen-5-lt-ca...-5-vvt-delete/ and spec at .600 to .612 lift. Supposedly cam motion and BTR have better valvetrain stability in their profile Texas Speed does have a good price on a darton sleeved short block. I think Pray is a vendor. They are just north of Austin. __________________ 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.