LTX

I have 10K to spend on a new rotating assembly and looking at crower they seem to have good quality products. does anyone know who has the strongest/lightest crank? i really like crower titanium rods but there 5k just for a set. looking to spin 8200rpms at max. so i need a very light assembly. 355ci

thanks, Aaron.

97Z28SS

iTrader: (5)

I believe the stock cast crank weighs in the neiborhood of 53#.

RamAir95TA

iTrader: (2)

What the **** are you building that needs a $10,000 rotating assembly?!

355z28

iTrader: (8)

Maybe a promod lol. And I thought I got carried away buying compstars.

Why not pick up a set of oliver rods?

GIZMO

iTrader: (8)

Yep. I just weighed one out of one of my Stocker motors. It is 52.6 lbs.

If I were building a high rpm motor, I would start with the lightest pistons and pins that will survive the combination. The stock crank will most likely live N/A, but the crank is a great dollar/HP place to save weight. For the rods I would skip the titanium and buy the lightest forged rods that have 7/16" rod bolts.

Keep in mind that engine components are like anything, you get what you pay for. If you can't afford good stuff change your goals or wait.

96capricemgr

iTrader: (1)

A friend recently put together a 8500rpm gen 1 with a 3.750" stroke, ended up with a Callies Magnum I believe and he has a hardon for Lunati ProMod rods so he used those with I believe custom CP pistons.

As of last night he was in second place for Dragweek smallblock NA so it is holding up fine.

blakez28

iTrader: (6)

100 bucks says you just got back from deployment..

ahritchie

iTrader: (1)

LOL...+1 I too have noticed those in the military like to spend major cash on fast cars and crotch rockets IMMEDIATELY when they get home.

GREGG 97Z

iTrader: (4)

LMFAO!! Seriously though, if you are going to spend that much just on the rotating assembly, what is the total $ amount going to be with heads and the rest? $15-20??? Hell you could pick up a complete LS7 crate motor for $14k. With a few boltons it would probably destroy even a high $$ n/a 355 LTX build. Just something to think about.

jallen100

iTrader: (4)

Oliver Rods
Callies Crank
Diamond pistons.
May not be the lightest but it will be strong as hell. We used these when we were racing NSCA back in the day.

blakez28

iTrader: (6)

Trust me I get it, it's what we think about while we're doing our job.
But most guys on post around here, have more money than since.

LTX

Well im planning to build a high RPM LT1. putting down 500fwhp with AI 215cc heads and mild SR cam. 8200rpm im gonna need a hell of a rotating assembly for it to last. this is my first motor build and im having a friend help me. but any suggests? i know i can make the same power for less but i just ****** love high rpm chevys.

GIZMO

iTrader: (8)

I doubt that you will have to turn it that hard to make that kind of HP. What will you be doing with the motor in question?


To do a good LS7 conversion costs a fortune. You are leaving out headers, computer, engine mounts, and a ton of other stuff. Besides, he couldn't run the LTX Shootout if he did that!

97Z28SS

iTrader: (5)

I also believe he'll need more head and cam than "AI 215 cnc and a mild sr" to spin 8200 rpm and he didn't mention shaftmounted rockers and very very good valvesprings which will also be needed. By the way OP what cubic inch engine are you thinking of building a 355 or something bigger?

GIZMO

iTrader: (8)

I agree on the cam to turn the rpm's. You could do a valve job on the stock heads and add good 1.94"/1.50" valves, valve springs, retainers, and locks and make that HP number. It all depends on what the OP intends to do with the end product.

z_speedfreak

iTrader: (3)

well a callies magnum Xl crank would cut some of the weight down and it'd still strong

Money1

My Crower crank and rods only ran about 3,500.

LTX

A 355ci btw just curious what is the biggest you can get out of an LT1 block? i heard a 410ci is about the biggest.

really? so crower is a no no?

Money1

Crower is a no no only if you want to use cheap made in china ****

fex77k

iTrader: (2)

My 396 almost made that on w/ a carb and about 2k less rpms. I'm running some small Dart Pro 1s that have been worked over and a very streetable cam.


What kind of oil system are you going to run?
How much do you want to spend on the crankshaft?
Who is going to machine this thing for you?
Are you going to buy front and rear mains?
How often are you going to check the springs?
What kind of driving?


Honestly you need to spend big money on the top end when you want to run in the 8k range. You are going about this build the hard way, I would look to build a lower RPM high TQ motor, this is your first time you dont need a money pit. You aren't going to want to spin a 410ci to 8k, 355-396ci is were you might want to keep it.
High end dirt track motors are easily 20k, once you start putting Ti in a motor the price gets ridiculous. 1200+ for Ti valves at least that for a shaft setup. You are going to have a large shop bill, none of these parts can just be slapped together.