Re: Limits of a 318 cast crank
[Re: Porter67]
#2247295
02/04/17 06:36 PM
02/04/17 06:36 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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I've seen them break near the center main on a stock setup.
Hard to say really.
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: Limits of a 318 cast crank
[Re: Porter67]
#2247336
02/04/17 08:12 PM
02/04/17 08:12 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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up yours
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Guess you could have it magnafluxed to look for cracks.
Can't say I ever saw a 360 crank break the same way, might be why they went to bigger mains on them.
If you could find a cheap forged 273/318 crank it might be an option.
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: Limits of a 318 cast crank
[Re: Porter67]
#2247360
02/04/17 09:04 PM
02/04/17 09:04 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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Well,
I prefer 360's myself and if I was gonna spring for a rotating kit I'd go for the cubic inches a stroker gives you.
But if I was gonna go for minimal fuss a mild 318 is the definition, I'd add a cam and a 4bbl and otherwise keep it stock.
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: Limits of a 318 cast crank
[Re: Porter67]
#2247366
02/04/17 09:13 PM
02/04/17 09:13 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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a street setting, and balanced. I think you will be fine. I'd suggest a 360 with a 4" arm but if you are already together with what you have I'd go have fun.
live every 24 hour block of time like it's your last day on earth
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Re: Limits of a 318 cast crank
[Re: Porter67]
#2247374
02/04/17 09:23 PM
02/04/17 09:23 PM
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Joined: Jun 2014
Posts: 5,183
Porter67
OP
master
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OP
master
Joined: Jun 2014
Posts: 5,183
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Im thinking by time I fiddle faddle around with a oem crank, old heavy slugs, and still buying bearings and a BIG balance job my 360 is a good base and I should just order the dam kit.
And the 360 kit is internal balance and thats all I currently have is all neutral balance stuff.
Last edited by EV2Bird; 02/04/17 09:23 PM.
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Re: Limits of a 318 cast crank
[Re: Porter67]
#2247727
02/05/17 02:24 PM
02/05/17 02:24 PM
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Joined: Jan 2005
Posts: 4,404 Michigan
MarkZ
Worthy
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Worthy
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Michigan
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Not what im wanting to hear but understandable.
Ive never heard how a lil 4.00 stroked 318 runs in a small bore but it is a option.
I can do one build for me currently and im trying to sort out options.
There is a member on here that built a 390 using a 4" crank in a 318 block. Flypaper? I can't remember.
1987 Fifth Avenue - 512/518/D60
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Re: Limits of a 318 cast crank
[Re: Porter67]
#2248966
02/07/17 04:34 AM
02/07/17 04:34 AM
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Joined: Feb 2003
Posts: 4,792 Castlegar, BC, Canada
That AMC Guy
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master
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Castlegar, BC, Canada
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Twenty Years ago, Hot Rod Magazine (ie: David Frieburger) put a 150 shot of nitrous on a junkyard, cast crank 318. It survived until it had a piston failure. Don't think they hurt the bottom end any.
Bloody Mary, Full of Vodka, Blessed art thou among cocktails....
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Re: Limits of a 318 cast crank
[Re: Porter67]
#2248969
02/07/17 05:39 AM
02/07/17 05:39 AM
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Joined: Jun 2014
Posts: 5,183
Porter67
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I got to stop being like a lady in a shoe store and make up my dang mind and just order the parts.
Back in high school when 340 and 318 A body cars were everywhere even the 318 with 340 heads ran good.
I overspend, overbuild and 90% of the time im racing a gps meter by myself, fun but not practical or cheap, not everything has to be a stroker and run 10s to have fun, but it is fun.... I just got to get it through my head.
Id really like to put the 318 block back in the car, a simple 76 duster and can do the 318 semi right for 1/2 the cost of the 318/370 stroker.
I have some wiseco PTS529AS pistons already and could do a nice near 9:1 318, I got a hughes girdle on the wall and a old 150 plate kit... see there I go.... why do I need the plate kit on a low po 318?
Ordered a nice kit for the 904 though today, so its a start.
Alot of good 318 builds on fabo on some nice "real" street cars.
Im gonna mag and test fit the crank tomorrow and see where im at on fitment and clearances.
So maybe a bore/hone and balance job is in order, if I use the 340 rods I think its gonna need metal in the crank, the scat I beams are light and $300 and might be better money spent then oem rods and $crank weight.
I just want one of my cars I can drive 500 miles in a day if I want and not worry it.
THANKS!
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Re: Limits of a 318 cast crank
[Re: dvw]
#2249029
02/07/17 12:24 PM
02/07/17 12:24 PM
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Joined: Oct 2003
Posts: 21,345 Marysville, O-H-I-O
70Cuda383
Too Many Posts
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Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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The 360 stock crank will take a lot. We've run one to 850hp. Doug I know a guy in the Dakota community with a turbo 5.9. Stock bottom end and he's in the 10s with a 4K lb truck. It's all in the tune
**Photobucket sucks**
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Re: Limits of a 318 cast crank
[Re: Porter67]
#2249212
02/07/17 05:59 PM
02/07/17 05:59 PM
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Joined: Jan 2004
Posts: 8,233 fredericksburg,va
cudaman1969
master
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master
Joined: Jan 2004
Posts: 8,233
fredericksburg,va
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I got to stop being like a lady in a shoe store and make up my dang mind and just order the parts.
Back in high school when 340 and 318 A body cars were everywhere even the 318 with 340 heads ran good.
I overspend, overbuild and 90% of the time im racing a gps meter by myself, fun but not practical or cheap, not everything has to be a stroker and run 10s to have fun, but it is fun.... I just got to get it through my head.
Id really like to put the 318 block back in the car, a simple 76 duster and can do the 318 semi right for 1/2 the cost of the 318/370 stroker.
I have some wiseco PTS529AS pistons already and could do a nice near 9:1 318, I got a hughes girdle on the wall and a old 150 plate kit... see there I go.... why do I need the plate kit on a low po 318?
Ordered a nice kit for the 904 though today, so its a start.
Alot of good 318 builds on fabo on some nice "real" street cars.
Im gonna mag and test fit the crank tomorrow and see where im at on fitment and clearances.
So maybe a bore/hone and balance job is in order, if I use the 340 rods I think its gonna need metal in the crank, the scat I beams are light and $300 and might be better money spent then oem rods and $crank weight.
I just want one of my cars I can drive 500 miles in a day if I want and not worry it.
THANKS! Those stock rods are the same as 340 rods with out the floating pin, less hassle, different bore, big deal, you'll never know the difference. Keep the small valve head (360) good cam-intake-carb-ignition and have fun.
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Re: Limits of a 318 cast crank
[Re: Porter67]
#2249238
02/07/17 06:53 PM
02/07/17 06:53 PM
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Joined: Jan 2003
Posts: 10,528 Freeport IL USA
poorboy
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,528
Freeport IL USA
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I whaled the living tar out of a lot of small block Mopars back in the 70s-90s. The only crank I ever broke was a forged 318 that was turned ,010/.010, it broke between the 1st rod throw and the 2nd main. I suspect it may have been cracked. Motor was a .030 over bore, 340 heads, big cam, big carb, headers, and 3 summers of abuse before hand. It was on the street, in a 70 Road Runner with a 4 speed, after a full night of hard thrashing and some serious high rpm 1/2 shifts. The next day it had what sounded like a lifter noise, and it suddenly started throwing the fan belt off, it had great oil pressure. About the 3rd time I put the belt back on, I saw the balancer lift up and knew I had a problem. I replaced it with a quickly rebuilt 340 short block, (rings & bearings), reused the heads & cam, and hammered on. Gene
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