Kurtis2short

iTrader: (4)

I have a 6.0 virgin block 4.0 and I have a 3.90 forged crank and I'm buying a stud girdle with arp studs. I have a set of after market ls3 heads and will be boosting a set of tc72s. With the right cam can a 4 inch bore with a 3.90 crank reach 8000? I think 15 to 18 pounds singing at 8k will sound like the heavens playing.

LS1NOVA

iTrader: (12)

What intake? Solid roller?

Kurtis2short

iTrader: (4)

A Holley hi-ram 102 mm a roller cam with Cadillac CTS-VR racing roller lifters designed for 9 to 8500 rpms

Kurtis2short

iTrader: (4)

8000 to 8500 sorry stupid little buttons on my cell

123quattro

Bore size doesn't really matter for engine rpm, the stroke is much more important.

67Firebird455

iTrader: (27)

Big bore, short stroke is the ticket if you're looking for displacement. The long throw is what kills engines at high rpm.

Kurtis2short

iTrader: (4)

I'm still trying to figure the ls1s out I'm running the 6.125 rod. On my old set up my bbc 427 I was just running 6.385 inch rods and custom pistons.

87silverbullet

iTrader: (11)

Koolrays on here runs about a 410 cube motor and he turns 8500 with it. It has a 4.130 bore to use a good cylinder head.

67Firebird455

iTrader: (27)

Well that is because of the piston height of the custom pistons. Use a 6.125 rod (billet steel or aluminum if drag only).

Kurtis2short

iTrader: (4)

My whole bottom end is forged with h beams 6.125 and wiesco pistons that's been coated and up graded wrist pins with hell fire rings. The heads are procomp ls3 heads that are cnc'd I don't think the breathing will be a issue. I don't plan on turning it all the time to 8000 just when I feel like having some fun. I'm thinking ill have to run Jesel shaft rockers though

Kurtis2short

iTrader: (4)

I'd just like to keep the 4 inch bore with the turbo app I think the thicker the better

SPRAYED 01

iTrader: (22)

What is the goal? Why do you need 8000rpm?

Kurtis2short

iTrader: (4)

I wanna beat a few of my buddies that are running vipers around the track. I really hate losing and I have a 3rd gen formula that I'm setting up for it. All suspension is umi with a brake up grade from fly bye to run 5th gen as brakes and rotors and I'm viper specify my t56 as we speak. I wanna beat then not only in a straight line but around the track so, I'm thinking a 1000 rwhp plus turning 8000 grand will do. Will I have 20k in the car plus yes and it sounds like fun

djfury05

iTrader: (30)

Unless the transmission is being face plated you will have heavy wear on the internals above 7000 rpm, really anything above 6500 rpm as quoted from RPM Transmissions. I'd stick with 7000rpm as the goal. Your really going to need some high quality expensive parts to run at an excessive rpm for extended lengths of time. I'd look into doing a dry sump conversion for a track car as well.

Kurtis2short

iTrader: (4)

The oiling system since the f body Pan dry slumps around hard cornering I bought a improved racing trapped door that's oppose to elongate that and using a hv melting oil pump for 30 percent more flow. And I have a article in rpms transzilla build and a lot if what they did I'm doing. I figure driving and racing it the motor will only be I the 8000 range 30 percent or so once I have the bragging rights it'll be a weekend event car and Sind street racing

Kurtis2short

iTrader: (4)

And to keep the temp down on the tranny I was thinking around running a cooler for it

Cronic_Moronic

You don't need 8k rpms.

Just power and correct gearing.

Kurtis2short

iTrader: (4)

There's a lot of things I don't need but it's what I'm desiring I'm just asking will it do it I'm always using 1 7/8 up and forward obx turbo headers

87silverbullet

iTrader: (11)

You uncover that oil pickup for just a split second and you can say bye bye to your engine
Those heads will be a bottle neck to turn 8-8500 on a turbo application plus the Procomps are not known for good quality so you will probably lift them with any decent amount of boost.

having a 4 inch bore is going to limit your choice of cylinder head. You can go 30 or 40 over and still be ok

On a road course you can build a well built motor and dump your money in the suspension and gearing and be better off.

Using procomp heads and OBX headers tells me already you are going the budget route to do this. That is the wrong way to achieve this goal that you are trying to accomplish. You will have more problems and headaches with all of the brick walls you are going to run into. To get a good intake to breathe at 8000 rpms is going to cost you more than what the heads and headers you are going to buy. You need to do more research on what it takes to make a motor turn 8-8500 in a turbo application because what you have isn't it. Either you need to scale it back or spend the money in the right places.

1sick-Z

iTrader: (3)

I would go solid roller and destroke the your 6.0 along with stud girdle, a sheet metal intake and God only knows what kind of heads. Maybe C5R heads. You may need to go distributor style ignition driven off the camshaft as well to get it to spin up like that. You would almost be better just running 25 psi and gearing it a little taller lol