93 4mula

Im fixing to get around to building a 383 stroker. Which rods do yall recommend using the 6.0 or 5.7? Doesn't the block have to be clearanced for either one? If I use the 6.0 rods can I still use the stock oil pan? Im going to run the GM 847 with 1.6 rockers so what valve springs,retainers, locks, locators do I need to get?

Chris 96 WS6

The block's going to have to be clearanced with either rod, because its the length of the crank throw that puts the rod bolts perilously close to the pan rails, not how long the rod is.

Injuneer

If you're never planning on a power adder like a blower or nitrous, the 6.0's will be good. If you are looking at a power adder, now or in the future consider a 5.85" rod to give you a little more compression height on the piston.

93 4mula

Yea its just gonna be all motor. Im not worried about Nitrous or a blower. So the 6.0 rods are what Im looking for then. Can I run the stock oil pan or do yall recommend getting an aftermarket? What about the springs etc?

96ta(nick)

I am looking at spraying 200hp worth of nitrous on mine do you think i should use 6.00 or 5.85" rods?

rskrause

I know people hate to hear this, but wrt rod length you really should do a search. The people who know much about this have already posted their opinions and (Fred excepted) are unlikely to want to do so again. I will say that more is made of this than it deserves. With the exception of the CH issue Fred mentioned, within the range we are talking about it probably doesn't matter.

Rich

Injuneer

Good point... it really doesn't matter all that much on an NA setup. More energy has been wasted debating the real benefits of rod/stroke ratio than it deserves for anything but an all out, purpose-specific racing engine. But the compression height is an issue that needs to be addressed.

There are some posts regarding this on "Advanced Tech", if you want to take a look (= "search").

NVetro

I did a search on this before i went and built my 383 stroker motor. I was going to go with the 6" rods that all those kits come with but decided to "build it once" and do it right the first time. I went with 5.7" Callies Compstar rods. I was reading, and several people said this, on a N/A motor you wont even be able to know the diffrence. But for example on a nitroud motor, the 6" rod will actually keep the piston at TDC for a longer period of time then the 5.7". I belive, and please search to confirm what I am saying, if the piston is at TDC longer espeically when your running n2o you have a greater chance of detonation. Agian please search to confirm my statement.

93black-ta

my only advise is, before you start your buildup take your estimated cost and multiply it by 2. if you dont have that kind of change laying around go with the 355, rebuild your your engine with stock compnents wherever possible, , make more power with the same money putting it into heads and cam.
i should have went with a 355. i would have been done by now.
most of the stock components are good to most of our hp goals.

Injuneer

I don't think the issue with nitrous is so much the dwell time at TDC, its the fact that the longer the rod gets, the thinner the piston top gets, the farther up on the side the wrist pin sits, and when you drop the ring pack to get it away from the intense heat of the nitrous combustion, you end up with the wrist pin in the ring pack. You need more compression height to allow you to strengthen the top of the piston, and move the rings down a bit. Even with 5.85" rods on a 3.75" stroke, I'm running rail spacers, because the oil ring is in the wrist pin.

93 4mula

Would I be fine with 5.7 rods if I wanted to add nitrous to it?

WS Sick

Yes you would be fine. They make thick crown 6.0 pistons , but the second and oil ring have supports that hold them in place through the pin bore on the piston, just something more to come loose and worry about IMO.

I have 5.7s in mine and N/A it will rev almost as high as you want it to.

JustNO

There are 900-1000rwhp Turbo LT1s with 6.0 rods.. I don't think there will be a problem if you use 6.0 rods with forced induction or nitrous setup..

93 4mula

Yea I just need to know which rod would be better to run the 5.7 or the 6.0 while running juice. Which would last longer and not have to worry bout detonation

NVetro

I also agree with Injuneer on his statement. In theory wound't a 5.7" rod be abit stronger then a 6.0" rod? Curious about that if they were the same type and same material.