Re: 318 stroker
[Re: viperblue72]
#1250121
06/13/12 10:07 AM
06/13/12 10:07 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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is this going in a magnum powered truck? if so, mag 318 and 360 heads are the same.
pistons may be tricky. some looow compression pistons may be down enough in the hole with the stock 3.31" stroke to fit...otherwise you're into custom piston territory.
in the end you'll have a .090 under 360....guess I fail to see the point.
if you're going to stroke a 318, just put a 4" crank and get Icon pistons and be done....
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: 318 stroker
[Re: patrick]
#1250122
06/13/12 11:21 AM
06/13/12 11:21 AM
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Joined: Dec 2005
Posts: 1,495
Shelby mi.
JAKE68
pro stock
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pro stock
Joined: Dec 2005
Posts: 1,495
Shelby mi.
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Cutting a 360 crank mains down to 318 size make it prone to breaking or cracking near the filett area.This is not recomended. Put the 4in. strocker crank in it.
JAKES AUTOMOTIVE
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Re: 318 stroker
[Re: JAKE68]
#1250123
06/13/12 01:18 PM
06/13/12 01:18 PM
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Joined: Aug 2003
Posts: 3,245
Between a rock & a hard place
cudadoug
master
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master
Joined: Aug 2003
Posts: 3,245
Between a rock & a hard place
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Quote:
Cutting a 360 crank mains down to 318 size make it prone to breaking or cracking near the filett area.This is not recomended. Put the 4in. strocker crank in it.
And gain the advantage of off the shelf piston choices...
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Re: 318 stroker
[Re: cudadoug]
#1250124
06/13/12 04:14 PM
06/13/12 04:14 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
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I Live Here
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Posts: 16,376
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Seems to me this would be better in the regular Q&A section, but here goes:
If you can get the machine work done for cheap enough the 360 crank will be a happy street engine. Your machinist will need to leave a nice fillet radius on the mains, in other words no sharp corners, but after that it shouldn't be any weaker than say a 350 chevy cast crank, and those are in dirt trackers every Saturday night across the US. It has been done before and probably if you are going to drag race the engine a better crank is indicated.
There are three 318 pistons with the correct compression height, Sealed Power LC371, Silvolite 1278 and Clevite 224-1930. Comp distance on these is around 1.658, same as a 360 piston. They weigh around 20 grams more than a 360 piston so for a street engine it should be bolt together and go using the 360 external balance stuff.
The pin bosses will run into the crank counterweights so some material has to be ground off the undersides of the piston pin bosses. This has also been done before.
The real problem is the machine work could cost you nearly as much as a brand new 4" stroker cast crank and if that's the case, why bother with the 360 crank?
R.
For this engine you'd use a 360 head.
Last edited by dogdays; 06/13/12 04:19 PM.
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Re: 318 stroker
[Re: dogdays]
#1250125
06/14/12 12:04 PM
06/14/12 12:04 PM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
Seems to me this would be better in the regular Q&A section, but here goes:
If you can get the machine work done for cheap enough the 360 crank will be a happy street engine. Your machinist will need to leave a nice fillet radius on the mains, in other words no sharp corners, but after that it shouldn't be any weaker than say a 350 chevy cast crank, and those are in dirt trackers every Saturday night across the US. It has been done before and probably if you are going to drag race the engine a better crank is indicated.
There are three 318 pistons with the correct compression height, Sealed Power LC371, Silvolite 1278 and Clevite 224-1930. Comp distance on these is around 1.658, same as a 360 piston. They weigh around 20 grams more than a 360 piston so for a street engine it should be bolt together and go using the 360 external balance stuff.
The pin bosses will run into the crank counterweights so some material has to be ground off the undersides of the piston pin bosses. This has also been done before.
The real problem is the machine work could cost you nearly as much as a brand new 4" stroker cast crank and if that's the case, why bother with the 360 crank?
R.
For this engine you'd use a 360 head.
and the new pistons, milling of the piston bottoms, and machine work to the crank, and if you want to run any kind of lift, machining of valve pockets on the piston are significantly more expensive than a set of KB107's for a 360...
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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.....But why..... 
