Help!! 3.59 Stroker assembly

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Bigboy 68

it is what it is
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I just purchased a nice set of 3.59 stroker pistons they have .927 pins I need to know what rods I need to get and also where would I get a forged stroker crank for this set up thank you in advance
 
Home - SCAT Crankshafts

Cast cranks are around three fifty on summit. Forged above seven hundred if memory serves.
I cant remember the prices on rods.

On Scat's page just search for Chrysler engines, 3.58 stroke and that should get you to the part numbers list.
 
And that’s why this site is awsome:thumbsup:
 
No matter the block, a KB-107 in the proper oversize will work or any equivalent piston, flattop or domed or dished.
 
Confusing to me is the 3.59 number... either it's 3.58 (Mopar 360 but not a stroker), or it's 3.79 which in fact would be a stroker crank.
There are cranks for both strokes available... what rod length to use depends solely on the compression height of your pistons.

Btw. funny strategy to buy pistons first and then worry about crank and rods? :poke:
 
Confusing to me is the 3.59 number... either it's 3.58 (Mopar 360 but not a stroker)
Skip the 3.59 thing......

A 360’s crank stroke is commonly referred at 3.58.
A 340’s stroke is 3.31.
The old tyme stroker trick in the ‘70’s was to cut the 360 crank to fit into the 340. This with a .030 overbore makes a 372 cid engine. Or 372.61 exactly which some places round up to 373. Which is fine. Factory does this as well. Up and down in the cid. This makes the stock 360 crank a stroker crank for the 273/318/340.

I don’t know if there were big stroke stroker cranks available back then. I’m sure the 3.55 cid stroker crank and the down size crank for the 5.0 SCCA racing effort was. I don’t know about the other up stroke cranks like the 3.79 and all the others in between.

Bigboy’s high compression 372 should be a rip to drive.
 
Confusing to me is the 3.59 number... either it's 3.58 (Mopar 360 but not a stroker), or it's 3.79 which in fact would be a stroker crank.
There are cranks for both strokes available... what rod length to use depends solely on the compression height of your pistons.

Btw. funny strategy to buy pistons first and then worry about crank and rods? :poke:
If Bigboy 68 is Rodney (memory?) he has more mopar stuff than you and me combined. And my garage is full, with the yard overflowing. It’s more about the deal, unique builds for him. He has been known to make full size wagons go fast.

I never got to see his 67/68 Dart build though.
 
Skip the 3.59 thing......

A 360’s crank stroke is commonly referred at 3.58.
A 340’s stroke is 3.31.
The old tyme stroker trick in the ‘70’s was to cut the 360 crank to fit into the 340. This with a .030 overbore makes a 372 cid engine. Or 372.61 exactly which some places round up to 373. Which is fine. Factory does this as well. Up and down in the cid. This makes the stock 360 crank a stroker crank for the 273/318/340.

I don’t know if there were big stroke stroker cranks available back then. I’m sure the 3.55 cid stroker crank and the down size crank for the 5.0 SCCA racing effort was. I don’t know about the other up stroke cranks like the 3.79 and all the others in between.

Bigboy’s high compression 372 should be a rip to drive.
The 355 crank was 3.51” (?yellow alloy?) forged. Not as strong as 4340. I think it was 10XX something alloy.
 
The 3.55 cranks comes in several (*3 I think*) sizes.
There a 1053/1054... ahhhh I forget. True, not as strong as a 4340. But that is it a worry point.

The particular one I have is (IIRC....) a 3.45 stroke.
 
His name is Bob/Robert Mills, aka Superdart340 or Superdart426.
Interesting to see what combo he goes with, I'm confused (easily) already.
If Bigboy 68 is Rodney (memory?) he has more mopar stuff than you and me combined. And my garage is full, with the yard overflowing. It’s more about the deal, unique builds for him. He has been known to make full size wagons go fast.

I never got to see his 67/68 Dart build though.
 
Those pistons are probably made for NHRA Stock or Super Stock applications...
The rules allow for .010 over stroke, making a OE 360 crank 3.59. it is stamped 3.59 so that the .067 or .070 deck Ht will be correct when the NHRA tech checks it in tear-down.
(of coarse the engine builder would know that.. it would be made up for, when the block is cut)
 
Those pistons are probably made for NHRA Stock or Super Stock applications...
The rules allow for .010 over stroke, making a OE 360 crank 3.59. it is stamped 3.59 so that the .067 or .070 deck Ht will be correct when the NHRA tech checks it in tear-down.
(of coarse the engine builder would know that.. it would be made up for, when the block is cut)
This is what he bought:
JE pistons, SB Chevy, 4.08 bore, 11.75 compression ratio. | eBay
I bet
 
The 3.55 cranks comes in several (*3 I think*) sizes.
There a 1053/1054... ahhhh I forget. True, not as strong as a 4340. But that is it a worry point.

The particular one I have is (IIRC....) a 3.45 stroke.
I have that crank 3.51” and those rods that 70aarcuda sold bigboy 68.

I was thinking about the eventual rebuild of my 73’ Plymouth Road Runner’s 340 a few years down the road. A few year$ down the road though. The engine runs fine now.
 
IF in fact true, that is a creative route that would work. Maybe minor machining on the slugs some? (Valve clearance/angles) IDK.
After that, or actually before that, it’s piston pin & dome height to the deck height/cylinder head distance to be sorted out.
I really don’t see a reason it would t work if your willing to put in the effort.
 
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