Hey guys Im building a 383ci for my new turbo setup and Im looking for a forged crank that will work with 6" rods.All of the ones I see listed in summit are for 5.7" rods.

Im looking for something like eagle or a scat crank....not one of these 1,100 dollar suckers.

Also I would like some ideas on a nasty turbo cam and strong set of springs for the 383 with LE3 heads.

looking for 750rwhp with a PTK gt76 kit...

thanks for the help

 

The 5.7" cammed cranks will work with 6" rods, but balancing may require more heavy metal. You just might have to ask for a crank cammed for 6" rods to get more metal ont he counterweights. It might have more to do with internally balancing an engine which originally came with an externally balanced flexplate, but I'm no expert on how muchh is too much or not enough.

 

As above except for one thing. In GENERAL, a long rod piston/rod combo is LIGHTER than a combo for a shorter rod. Of course, any given model crank may not reflect this. But as stated, you can use a longer rod for with a crank listed for a 5.7" rod. You can also use a shorter rod, but maching the counterweights (or the pistons) will be needed.

BTW: the Callies Dragonslayer and the Lunati Sledgehammer series are moderate price high quality domestic 4340 forgings that I personally much prefer to the only slightly less expensive Eagle cranks that many people use. Either can be had as part of a complete, balanced RA, which is a big convenience and often a money saver when assembling an engine.

Rich

 

That's what we ended up going with for my motor. A Lunati Sledgehammer for a 5.7" rod as we were originally going to use a 5.7" rod, but due to developments unforseen we're moving to a Lunati Pro-Mod 6" rod, and my engine builder says it's no big deal.

 

well I have the pistons and rods so all I need to get the bottom end done is a crank


What about a cam ?

anyonr got a good place to start?

 

Callies also has the Compstar line of cranks, which retail for around $700.
http://www.compstarcomponents.com
You can get them through Victory Racing Engines

 

Here's my Lunati Sledgehammer balanced for 6" ProMod rods and 400 gram pistons. You can see the machine shop added one hunk of mallory in the back (the crank came with one in the front) and they took off metal near the rod journals. I have a SFI TCi flexplate, neutral balanced.

 

Opinions vary wildly on this. You pretty much can't go wrong with something in the 225/225-114 range. We just made 930 hp and 1050 ft-lb with a 377, T-76GTS, 18 psi boost, on a 230/230-114 cam.

 

I'm with ya Mike, I did single pattern cams for a good portion of my forced induction stuff. Always make great power.

As for a crank, I think the compstar would be a good option. They have two 3.750 cranks, one cut for 5.850 and another for 5.700.

-Nick

 

What about the compression stack height, can it be addressed with higher pinned pistons or other well enough?

 

location of the pin and the compression distance will be adjusted accordingly to work with whatever rod and crank combo you have.

I'm not sure I follow what you are asking?

 

I don't know crap about building engines. I was just concerned about the top of the piston not being thick enough for that much boost that's all ...I could be way off base ...

 

To Sparkz... the same wild opinions that apply to cam timing for turbo engines applies to the use of rod length. If this destined to be a street engine, you are wasting your time with the extra effort to accommodate the longer rod. With the variables present in a street application, you wont ever see a diff. Hell, in class ¼ mile racing with variables held a lot tighter, 6.0 and 5.7 compete against each other with no discernable diff. IMO, you are wasting your time. I'd be more concerned with issues such as what 'canbaufo' brought up, but of course it's your decision.

 

well....I have the rods , its not like I cant get another set....if I m waisting my time with the 6: rods tha tI can snag some 5.7s....no biggie

 

All I'm really saying is, don't go out of your way to spend the effort or more $$ than otherwise required. Won't state it is bad, just not any better.