408 Ls3/l92 467/460
02-12-2008, 02:53 PM
#21
Its a good idea, the intake is all wrong for this camshaft by far and the valvetrain currently isnt up to the task either. I think its a work in progress for Rick, Im not sure who came up with the combination but its getting ironed out a bit at least.
02-13-2008, 12:08 AM
#22
I made 475/440 on a Mustang Dyno with my 408 with a 244/248 .635/.627 112, ported LQ9's, LS6 intake, and ported TB through a high-flow catted Y and LM1. Intake restriction is not the issue... that cam combo is just not working. 35 degrees of overlap? Geez. What's your DCR? It's gotta be in the 7's somewhere.
02-13-2008, 06:54 AM
#23
I'm never going to run nitrous or boost and I run the stock valves. They are actually nice valves and nicely backcut. Lighter than many of the aftermarket stainless. I run Comp 921's, Trend .110 wall pushrods and Caddy Racing lifters. I don't have any signs of valve train instability to 6800RPM. I recently added a set of YT Ultralight rockers for reliability. I picked up nothing but didn't loose anything either.
My $.02
02-13-2008, 10:22 AM
#25
I made 475/440 on a Mustang Dyno with my 408 with a 244/248 .635/.627 112, ported LQ9's, LS6 intake, and ported TB through a high-flow catted Y and LM1. Intake restriction is not the issue... that cam combo is just not working. 35 degrees of overlap? Geez. What's your DCR? It's gotta be in the 7's somewhere.
This was done on same dyno Jon, obviously its an engine with its head cut off right now. Dont get stuck on that DCR stuff though not always what its cracked up to be if your looking for midrange-up power.WKMCD... you have alot smoother lobe with much more spring and stability.. I told Rick before we made pull 1 I think vavetrain is going to be an issue. Told him Id look at coming up with a spring setup that will control that with lifters he is running (Ric what is their part number?) If can make valvetrain work with cam thats in it now great, but its going to want an intake change and ability to turn lotsa rpm, or a camshaft change
02-13-2008, 11:37 AM
#27
WKMCD... you have alot smoother lobe with much more spring and stability.. I told Rick before we made pull 1 I think vavetrain is going to be an issue. Told him Id look at coming up with a spring setup that will control that with lifters he is running (Ric what is their part number?) If can make valvetrain work with cam thats in it now great, but its going to want an intake change and ability to turn lotsa rpm, or a camshaft change
02-13-2008, 12:13 PM
#28
The intake IS part of the issue. Its a camshaft that should peak around 7300 and carry to 7800 or so, at least thats what our stuff does when the entire package is up to it. The cam is off for the intake and valvetrain, or the intake is off for the cam... however you want to put it! This was done on same dyno Jon, obviously its an engine with its head cut off right now. Dont get stuck on that DCR stuff though not always what its cracked up to be if your looking for midrange-up power.
WKMCD... you have alot smoother lobe with much more spring and stability.. I told Rick before we made pull 1 I think vavetrain is going to be an issue. Told him Id look at coming up with a spring setup that will control that with lifters he is running (Ric what is their part number?) If can make valvetrain work with cam thats in it now great, but its going to want an intake change and ability to turn lotsa rpm, or a camshaft change
This was done on same dyno Jon, obviously its an engine with its head cut off right now. Dont get stuck on that DCR stuff though not always what its cracked up to be if your looking for midrange-up power.WKMCD... you have alot smoother lobe with much more spring and stability.. I told Rick before we made pull 1 I think vavetrain is going to be an issue. Told him Id look at coming up with a spring setup that will control that with lifters he is running (Ric what is their part number?) If can make valvetrain work with cam thats in it now great, but its going to want an intake change and ability to turn lotsa rpm, or a camshaft change
02-13-2008, 08:20 PM
#30
Tell him I'll sell him my cam if you spec a diff. one for me next time I'm back in VA
02-15-2008, 06:34 PM
#33
I definatly wanted a screamer, but it still needs work, the l76 intake was never in my master plan i just got it complete + for cheap, The intake valves are actually the stockers according to tsp 106grams. i thought they were the 120g aftermarket ones they shipped them to me. I never thought the lifters would be an issue, or the valve springs having problems handle the valve. According to tsp, they had their cnc l92's with a somewhat similar cam i used making 550rwhp, which was what i was shooting for, dont know what the rest of their setup was though. I wasnt looking for a low end torque grocery getter. As long as it idles and pulls like hell up top its fine with me. plus i love the lopey idle. guess the direct port will be put on hold till i get this thing working right
11-04-2008, 07:57 PM
#40
well finally got around to putting a single plane on, now its pulling past 6200, the dyno sheet looks a little hairy. It was down on power below 5500rpm, which was expected, it actually was worse that i figured, but it still drives decent.