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oldman · 01-20-2020, 03:30 AM

Push rods, trunions, I went with Manley valves cause I’m paranoid. Power is pulley and rpm dependent. I’m tuned for a 4.0, 4.5 at 7000 rpm is 8psi. Had a 3.85 on which was stupid traction wise, calcs show 3.65 is about 90% on wheel speed at 7000 rpm near 1000 engine hp. 700 to 750 wheel hp is about the octane limit IMO on 11.5 cr. My first build was spec at 707 whp, this build with stock exhaust is about the same 707 wheel, 4.5 pulley on 93. I picked the cam for sound, to use the cam it would need 10.5 cr. Rough guess E85, lt, big injectors, dunno 800 wheel. U are limited both by cr and high side to 700 / 750 wheel, I call it all 707 wheel.

It has been my opinion that 800 and above engine HP builds should use heavy I beam rods and heavy forged pistons, rebalance crank or new crank with radius journals like the Lt4, main studs and 10.5 cr.

01-20-2020, 03:30 AM	#13
oldman Drives: SS 6 speed of course Join Date: Jan 2016 Location: Hilo, HI Posts: 4,316	Push rods, trunions, I went with Manley valves cause I’m paranoid. Power is pulley and rpm dependent. I’m tuned for a 4.0, 4.5 at 7000 rpm is 8psi. Had a 3.85 on which was stupid traction wise, calcs show 3.65 is about 90% on wheel speed at 7000 rpm near 1000 engine hp. 700 to 750 wheel hp is about the octane limit IMO on 11.5 cr. My first build was spec at 707 whp, this build with stock exhaust is about the same 707 wheel, 4.5 pulley on 93. I picked the cam for sound, to use the cam it would need 10.5 cr. Rough guess E85, lt, big injectors, dunno 800 wheel. U are limited both by cr and high side to 700 / 750 wheel, I call it all 707 wheel. It has been my opinion that 800 and above engine HP builds should use heavy I beam rods and heavy forged pistons, rebalance crank or new crank with radius journals like the Lt4, main studs and 10.5 cr. __________________ 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. Last edited by oldman; 01-20-2020 at 02:48 PM.