408 turbo cam recommendation
Dec 20, 2008 | 07:47 PM
#11
LOL! I was trying to be prudent and see what others were running before I crawled to the Synergy alter and ask the phophet for his divine answer!
Well Rick, since you stepped up, my question for you was a two parter:
1)Do I stick with the flattops and limit the boost to 14-15lbs (if that is do-able on CA 91 octane and a lot of Meth) or do I swap out the flattops for some dish pistons and kick it up to 17-18lbs. I am leaning on keeping the flattops (obviously they are aleady installed and ready to go) to help with mileage and everyday driveabiblity but is that going to put a limit on the overall potential of the system.
2) That said, a cam recomendation that will take advantage of the extra displacement and increase my bottem end torque whilr not choking off the top end charge.
Rick
Flat tops could put you at 12:1 right now. You need to see what piston it is, then meassure the deck on it. Then we can see what head you are using.Having stellar bottom end with no loss in top wont happen. You can keep a lot of it, but this world aint perfect.
Dec 20, 2008 | 07:51 PM
#12
Specs on the Shortblock:
408 short block: 6.0 iron block .030 over, eagle crank and rods, diamond -2 CC pistons, total seal rings, clevite rod and main bearings, ARP main studs, ARP head studs, hex adjust single chain, ported LS6 oil pump
It was freshened up with new bearings and rinks last May and has about 500 miles on it. The previous owner in building a 427 hence the sale.
I'm going to use a set of stock 317's on it. I actually have a set of LS3's and a truck intake assembly but I don't really have the funds to keep them and put in the 408. At least for the moment...
Seeing what Rick and others have done with just 317's, I'm not sure it is worth the expense.
Rick
408 short block: 6.0 iron block .030 over, eagle crank and rods, diamond -2 CC pistons, total seal rings, clevite rod and main bearings, ARP main studs, ARP head studs, hex adjust single chain, ported LS6 oil pump
It was freshened up with new bearings and rinks last May and has about 500 miles on it. The previous owner in building a 427 hence the sale.
I'm going to use a set of stock 317's on it. I actually have a set of LS3's and a truck intake assembly but I don't really have the funds to keep them and put in the 408. At least for the moment...
Seeing what Rick and others have done with just 317's, I'm not sure it is worth the expense.Rick
Dec 20, 2008 | 07:58 PM
#13
Specs on the Shortblock:
408 short block: 6.0 iron block .030 over, eagle crank and rods, diamond -2 CC pistons, total seal rings, clevite rod and main bearings, ARP main studs, ARP head studs, hex adjust single chain, ported LS6 oil pump
It was freshened up with new bearings and rinks last May and has about 500 miles on it. The previous owner in building a 427 hence the sale.
I'm going to use a set of stock 317's on it. I actually have a set of LS3's and a truck intake assembly but I don't really have the funds to keep them and put in the 408. At least for the moment... Seeing what Rick and others have done with just 317's, I'm not sure it is worth the expense.
Rick
408 short block: 6.0 iron block .030 over, eagle crank and rods, diamond -2 CC pistons, total seal rings, clevite rod and main bearings, ARP main studs, ARP head studs, hex adjust single chain, ported LS6 oil pump
It was freshened up with new bearings and rinks last May and has about 500 miles on it. The previous owner in building a 427 hence the sale.
I'm going to use a set of stock 317's on it. I actually have a set of LS3's and a truck intake assembly but I don't really have the funds to keep them and put in the 408. At least for the moment...
Seeing what Rick and others have done with just 317's, I'm not sure it is worth the expense.Rick
Its not worth keeping the LS3's over the 317's. Better response from the 317's.
Ok, I still dont know your pistons. Could be a few different sets from diamond. You need to know the compression height and what they are out of deck. From there we can know for sure. Sounds like you might be in the 10.0 range which I would try and stay away from if you are building a turbo motor.
Dec 20, 2008 | 08:20 PM
#14
I already have a buyer for the LS3's so they are pretty much out of the equation.
I won't get the shortblock for a week or two so I'll ask the owner if he can get me the piston part number and the installed deck height.
Thanks, Rick
I won't get the shortblock for a week or two so I'll ask the owner if he can get me the piston part number and the installed deck height.
Thanks, Rick
Dec 21, 2008 | 10:17 PM
#15
On The Tree
Joined: Jul 2006
Posts: 134
Likes: 0
From: Colorado
I don't know how difference between turbo and TVS but we made huge torque on a forged 408 at only 5.5lbs of boost with a 226-238, 601 601, 114. and a TVS 1900. I posted some dyno graphs about a month ago. Again we were running 9.1 compression with ported LS2 heads. The engine runs great.
Dec 22, 2008 | 07:28 AM
#16
TECH Veteran
Joined: Sep 2003
Posts: 4,534
Likes: 3
From: Las Vegas, NV
I would think you'd want something around a 224/218 on a 114 for your goal assuming your compression is actually around 10:1. A 408 with 10:1 compression and 12psi should be all the power you're going to need.
Dec 22, 2008 | 11:06 AM
#17
R
Dec 22, 2008 | 01:53 PM
#18
TECH Veteran
Joined: Sep 2003
Posts: 4,534
Likes: 3
From: Las Vegas, NV
I thought about that later after I typed it. A 116 would probably be closer to his stock driving type feel and desire. I see the fuel milage thing alot and it is something that should be important. Why build a bad *** truck and then not drive it because it's too hard on gas. I see many build a truck saying that they don't care about milage then later say that they hardly drive it because gas price it too high...
Dec 23, 2008 | 12:48 AM
#19
I thought about that later after I typed it. A 116 would probably be closer to his stock driving type feel and desire. I see the fuel milage thing alot and it is something that should be important. Why build a bad *** truck and then not drive it because it's too hard on gas. I see many build a truck saying that they don't care about milage then later say that they hardly drive it because gas price it too high...
Thats the best part about boost. Everyone forgets that they cam build a very simple and well balanced motor, and still make good power from boost. That why a lot of turbo vehicles are in the OEM world versus supercharged ones.
I used a 230/227 cam on marks 438, and I still thought I could of gone smaller.
Dec 23, 2008 | 01:10 AM
#20
On my setup, I'm running a 220/222-580/580-114+1 cam and have been very happy with it. I'm about 9.4:1 compression. Richard @ WCCH spec'ed the cam for me and it has worked very well.
On my original 408 I ran a 235/239-600/580-114+4 cam and I thought it was way too big. I didn't like it at all.
On my original 408 I ran a 235/239-600/580-114+4 cam and I thought it was way too big. I didn't like it at all.