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So I picked up a iron 6.0 to start a boost build in my 99 HOZ. Now what? Im thinking on either a 370 or a 408. I love big cubes but I hear that 370 will get the job done no problem. Im going to run the huron speed twin T4 kit, and will be using twin AGP turbos. Im looking for around 600whp, nothing too crazy since it will be daily driven. I have a stock crank I can use, ill just need to swap the reluctor. i will use a custom grind, but as for the heads, would porting the stock 317s really do much for me? also will be used with the holley hi ram. This will be going through a t56. Any suggestions would be appreciated.
I'm doing a similar build. Same kit, 6665's, tick turbo cam, 317's and a factory cube lq4 with a stick. Should have the car together this weekend and dynod pretty soon. I'll let you know what it makes
Don't have anything but the turbo manifolds bolted up. I have to do my radiator and then I'll finish up the kit. I can send you some pics late Saturday
Don't have anything but the turbo manifolds bolted up. I have to do my radiator and then I'll finish up the kit. I can send you some pics late Saturday
awesome thanks man
Originally Posted by itsslow98
370 will get it done all day long, twins are even overkill for 600.
A 91mm with a 6 speed would be horrendous for a street car. Small twins and a 370 would be fun.
What he said.
408 and 91mm for 600 HP? Don't be another one of those guys that spends 9 grand on his combo and then complains about the outcome. No point in going to with a 1400 HP turbo for 600 HP.
The base 58's that AGP supplies will do the trick. Those have made 1000+.
I may end up going that route. My buddy has a hookup on AGP turbos so that's my #1 option.
Originally Posted by itsslow98
A 91mm with a 6 speed would be horrendous for a street car. Small twins and a 370 would be fun.
yea if I go single im sure I wont run that big a turbo. but then again I said I was only going to run a 200 shot on my black car, but now im going 350 lol.
Originally Posted by JoeNova
What he said.
408 and 91mm for 600 HP? Don't be another one of those guys that spends 9 grand on his combo and then complains about the outcome. No point in going to with a 1400 HP turbo for 600 HP.
yea it is overkill for 600, but im saying 600 right now, im sure later that will change. I still want the ability to make more power without changing my setup to much.
I run twin 6165 on a 370ci with a 6 speed and it's a riot even when turned down to 10psi. Start seeing positive pressure by 2800rpm and they're full tilt shortly thereafter.
I built a 408 for my WS6 because the original crank in my 6.0 was garbage and the 4" replacement was the same price (forged).
4340 crank/rods, Wiseco Pistons
9.4:1 compression
AI 317s with 232 package
Tick custom cam 235/247 duration
Vic Jr/Aaron's elbow
The car makes 470 rwhp through a 6 speed/9 inch with no boost. I just ordered a set of 6766 billet wheel precision turbos and I'm just waiting for them to be built/delivered now.
I run twin 6165 on a 370ci with a 6 speed and it's a riot even when turned down to 10psi. Start seeing positive pressure by 2800rpm and they're full tilt shortly thereafter.
oh very nice. what kit are you using for the hot and cold sides? if you don't mind sharing whats your power at? are you full weight and on a stock t56?
Originally Posted by 97WS6SCharged
I built a 408 for my WS6 because the original crank in my 6.0 was garbage and the 4" replacement was the same price (forged).
4340 crank/rods, Wiseco Pistons
9.4:1 compression
AI 317s with 232 package
Tick custom cam 235/247 duration
Vic Jr/Aaron's elbow
The car makes 470 rwhp through a 6 speed/9 inch with no boost. I just ordered a set of 6766 billet wheel precision turbos and I'm just waiting for them to be built/delivered now.
Pretty good n/a numbers man. I have a good stock crank and that's one of the reasons I want to go 370 is for helping keep the cost down. what dish on your pistons did you go with to achieve that CR and that's with the .051"CT head gaskets? how are you doing it for your piping and manifolds? I really like the huron kit but Im seeing if others are just making their own piping or going with some other cheaper company.
I built a 408 for my WS6 because the original crank in my 6.0 was garbage and the 4" replacement was the same price (forged).
4340 crank/rods, Wiseco Pistons
9.4:1 compression
AI 317s with 232 package
Tick custom cam 235/247 duration
Vic Jr/Aaron's elbow
The car makes 470 rwhp through a 6 speed/9 inch with no boost. I just ordered a set of 6766 billet wheel precision turbos and I'm just waiting for them to be built/delivered now.
That's encouraging for me to read.
I just finished buttoning up my engine and it's damn near identical to yours. TSP stage 2.5 CNC 317's at about 9.5:1 CR 408. Tick cam a little bit smaller that yours but everything else listed is the same. Twin Turbonetics 66/65's In a GTO.
Planning on turning the key this weekend. If I get anywhere near that kind of power N/A, I'd be super excited.
OP, I voted 370 vs. a 408. Only reason I went with a 408 is because I already had a good used rotating assembly from my 403 LS2 that I was able to swap over. The shorter stroke, pin location on the piston is a plus IMO.
Good luck, 600 WHP should be no issue. My old 403 lit up those turbo's instantly on the street.
oh very nice. what kit are you using for the hot and cold sides? if you don't mind sharing whats your power at? are you full weight and on a stock t56?
I run a faceplated t56. My hot/cold side is all custom, but it's laid out pretty similar to the new huron t4 twin kit. I haven't had it to the track or dyno yet, but in the car's previous nitrous life it would go mid-low 10s at 135mph weighing 3900lbs which is about ~675-700rwhp. I haven't weighed it with the turbos but it should be similar weight. I can tell you with the turbos on 10psi it's killing 28x10.50 MT's on the street like it never has before, so it's making at least the power it did on the nitrous. I've turned it up to ~14psi a couple times and I can lay into it in 3rd at 70mph and stripe the highway as long as I stay in it.
haha that's badass. I cant wait to get more progression on this build. So Im about ready to send my block to the machine shop. my question is, (ive looked and cant seem to find the answer), what rod length and stroke do I need to go with to get the 370. I heard it was just a bore .030 over and using stock stroke and rod length but I cant find a definitive answer. someone please shed some light.
And btw, I have made the choice to go 370 on twins. Going to use AGP Zeta 3.0 turbos and probably fab up my own piping with a friend. what piston volume/CR do you guys recommend? I was told do stay in the 9.5-10.0CR area. I used the "CR Calculator" and came up with 9.3CR with a -11cc piston. I was thinking of going that route. Thoughts?
06-08-2015, 09:45 PM
Going twins on iron block, suggestions please 
