Re: 318 and 360 pistons
[Re: Dakota_Don]
#1256551
06/24/12 06:33 PM
06/24/12 06:33 PM
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Joined: Nov 2009
Posts: 2,177 ill
dennismopar73
top fuel
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Joined: Nov 2009
Posts: 2,177
ill
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Quote:
ummm no
some one may say yes,, BUT I WONT!! HI DON!
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Re: 318 and 360 pistons
[Re: Clayton]
#1256556
06/24/12 07:55 PM
06/24/12 07:55 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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Not likely a 318 would take that much oversize plus the compression height of the 318 and 360 pistons is different & will not interchange
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Re: 318 and 360 pistons
[Re: Baxter61]
#1256558
06/24/12 09:06 PM
06/24/12 09:06 PM
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Joined: Jan 2003
Posts: 2,111 Bowie, MD
Reggie
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Joined: Jan 2003
Posts: 2,111
Bowie, MD
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Comparison pic with 360 piston in the middle. It will probably be a low compression dog...
Last edited by Reggie; 06/24/12 09:06 PM.
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Re: 318 and 360 pistons
[Re: Reggie]
#1256559
06/24/12 10:11 PM
06/24/12 10:11 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
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About to go away
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Posts: 14,889
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Some have taken the old POLY 318 out that far and put a 3.58" stroke crank in them too.
But an LA 318? I would say no.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: 318 and 360 pistons
[Re: Supercuda]
#1256560
06/25/12 09:52 AM
06/25/12 09:52 AM
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Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
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I Live Here
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Florida
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Quote:
Some have taken the old POLY 318 out that far and put a 3.58" stroke crank in them too. But an LA 318? I would say no.
I have an old magazine artical that did this with a poly block 318,.120 over bore,3.58 stroke crank. forgot what pistons,I will dig it up and re-read it.
seems I have saw LA 318s bored for sleeves to go to .120 overbore at my local machine shop,said it was the only way unless a LA 318 was sonic checked to see if it was thick enuff for a large bore. very few but a couple have been found from what he said.
a few have said you can cut a 360 crank to fit the LA 318,then use early lopo 318 pistons with some clearceing on the piston pin boss and skirts, which will also help on the balanceing. makes a 346 stroker IIRC.
what I am doing is a cut down 3.58 stroke crank,.030 318 roller cam block, 349 stroker pistons, should be plenty torque for my truck and I had all of it exept pistons.
Last edited by scratchnfotraction; 06/25/12 09:57 AM.
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Re: 318 and 360 pistons
[Re: Clayton]
#1256564
06/27/12 11:14 AM
06/27/12 11:14 AM
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Joined: Jan 2003
Posts: 16,122 Grand Haven, MI
patrick
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I Live Here
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Posts: 16,122
Grand Haven, MI
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Quote:
If my math is right I would only have to bore the 318 to 40 over, a 318 won't take a 40 overbore?
stock 318 bore is 3.91. .030 over 360 is 4.030....re-do your math. I get .120" over (or about 1/8")
then you have the compression height problem. a 318 has a 3.31 stroke, with pistons about 1.72" compression height stock. a 360 has a 3.58" stroke with ~1.6" compression height pistons, so if you used the stock 318 crank, you'd be like .2" down in the hole, and have no compression....
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