3500 crank

[Driver_10]

The 3500 rod is 5.9", I coudn't find the rod length of a 3400 on Alldata or Mitchell. Chevy rods are stock length at 5.7", altho nearly any length can be ordered. The difference of .200" leaves the stock height 3400 piston about -.075" in the hole..

Lots of engines share the 92mm (3.62") bore, so it would only be a matter of searching to yeild a piston with the correct pin height to get zero deck.

With the 60 degree deck height of 8.818", minus the stroke divided by 2, minus the rod length, and you need a piston with around 1.333" pin height. The stock 3500 piston has a 1.263" pin height.
(8.818 -(3.56/2)-5.7=1.333)

The 4.3l v6 rod has a similar journal bore (only a hair smaller) and has plenty of aftermarket support. There are verying legnths and style (I-beam, scat ect) from different manufactures. The wrist-pin bore is slightly larger in the 3500 piston and would require some resizing reguardless.

[bob442]

I just want to clear on thing up, the forged crank is the better of the 2 cranks? and to inspect if you have the right crank with out dropping the oil pan, you remove the ballancer bolt, and you will see the number 7484, or do you have to remove the ballancer? i'm Just curious, a complete motor popped up for $300 with 70xxx km. a picture showing where the number is would be sweet. thanks.

[Joseph Upson]

I just want to clear on thing up, the forged crank is the better of the 2 cranks? and to inspect if you have the right crank with out dropping the oil pan, you remove the ballancer bolt, and you will see the number 7484, or do you have to remove the ballancer? i'm Just curious, a complete motor popped up for $300 with 70xxx km. a picture showing where the number is would be sweet. thanks.

It may or may not show up behind the balancer bolt as in once you remove it you can look for it at the end of the crankshaft. The easiest thing to do is get the year make and model it is from and call GM for a part number. If they list two numbers for it you'll need to check, if they only list one then you shouldn't have to worry about it. I believe GM switched to making all of the cranks from forged steel in the later engines of the series.

[bob442]

it was from a 05 malibu, # read on crank 4122111, # on timing chain cover 12593231 2374 ROUSH, and block was 3074. I would *like* to get the forged crank as i am an abusive driver, need i say more?
i got the crank number from here (its blurry as hell so i wrote it down)

http://i15.photobucket.com/albums/a351/bob442/003-3.jpg

Roush?

http://i15.photobucket.com/albums/a351/bob442/001-5.jpg

[kwhauck]

not to thread jump here, but if that motor doesn't work out for you, I have a 3500 forged crank I would be willing to let go of for cheap.

[kwhauck]

damn, so 2 1/2 years after i started this thread.......i get my stroker rotating assembly from the shop in Colorado, and then it is back to SD where I need to find a new machine shop to finalize things up for me...

pictures and details will be posted when i get the stuff but basically

JE stock compress pistons, manley rods, 3.7 displacement with a 10mm stroke

[bob442]

what exactly happened?

[kwhauck]

happened with what?

[bob442]

to finalize the crank...

[kwhauck]

picking it up tomorrow....

[Nick-G]

picking it up tomorrow....

Pictures FTW!

[kwhauck]

Got it yesterday!!! Got home late last night, about 1400miles round trip between the two machine shops and home...

The corolla with two blocks, a set of heads, and other various items in the trunk......lol.....





about half of it on the garage floor



Comparison of the two cranks, bottom (closest to camera) is forged stroker crank, top is stock 3400 cast crank...



Forged crank

[kwhauck]

rods compariston, far left is stock 3400 rods, middle is narrowed Scat SBC rods, Right is Manley narrowed SBC rods..

Manley rods seem pretty light! off hand anybody know the big and little end weights of stock rods?







Piston/ Rod combo, pistons are custom JE pistons with a 3.635 bore





deep dish baby!!

[Joseph Upson]

Do you know whether or not heavy metal will be needed to balance the assembly? The reluctor ring mounting circle has an assymetric area that would affect balance if removed such as in your case in addition to the parts changes.

[kwhauck]

Do you know whether or not heavy metal will be needed to balance the assembly? The reluctor ring mounting circle has an assymetric area that would affect balance if removed such as in your case in addition to the parts changes.

i honestly couldn't tell you. I would assume they knew what they were doing when it was put together. It is a modified 3500 crank from jbody performance. I will let the machine shop do the fine details, since I honestly am a little scared to assemble the bottom end since I have a lot of money into my motor and don't want to mess anything up.....