318 with 360 crank?

yes it can be done, but it requires pretty serious cutting of the crank..

Jake

Yes! I had a 1970 Duster with this combo. A 270 Comp cam, 800 TQ, Weiand intake, Hooker headers. The car flew!!
There have been several magazines over the years that have had articles on this mod. Go for it Make sure you balance the
rotating parts.

the mains on the 360 crank would have to be ground down to 318 size mains. Then you would have to go with either special pistons or maybe the stock pistons with the top part of pistons milled down. Thats the way www.speedomotive.com does it. that may make the top piston ring to close to teh top of the bore though.

If you're buying custom pistons you might as well get the 4" MP crank which will net you a 390 vs. 349 with the 3.58" crank (+.030 overbore)

Why not just save a bunch of money and use a 360 block with the 360 crank? I don't see any advantage to putting a 360 crank into a 318 block.

I have heard that a 318 will put out some serious power that way. More so than a built 360.

I've got an old magazine with an article about building the "Mopar 350" (360 crank in the 318 block). It gives specifics about the how much the crank needs ground, what sort of rods & pistons to use. The article is more than 10 years old so some of the specific part choices may have changed but otherwise it should still be accurate. If you want me to scan it & send you a PDF, let me know.

Dan

mopar65pa said:

I have heard that a 318 will put out some serious power that way. More so than a built 360.

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How it that possible? It would have the same stroke as a 360, but with slightly smaller bores and smaller head ports.

I know a guy that did it! He's a member too.

Doh!!! wtf you guy's are all behind the times this was done years ago because the crank wasn't available just go and pick a stroke you want, and build it.

Oh by the way years ago it was put the 60 crank in the 40 block (doh not the 18 block) and it was bigger and better than the 60, you then had to use a x rod i think if memory serves me and machine quite a bit off the top of a good piston (not a junk piston) and then it worked, but this was done years ago because there wasn't a thing called a stroker crank or well atleast 1 for under a few thousand, the other trick was to offset grind it and do it but i am slowly forgetting all that stuff thank god.

Just go and look for a stroker crank

that speedomotive website was quite interesting it sounds like it would be a bad little motor jumping a 318 to a 390 i think thats quite a bit of a jump way more power than a 360 if u ask me, cuz i mean u stroke a 360 and its a 408 not as much gain as a 318 to a 390. and ya scan that sucker if you dont mind id love to build one and i lookin for all the info to do it cuz i got sevral 318 blocks and a 360 crank layin around
Thanks
TYler

muddSlinger3187 said:

that speedomotive website was quite interesting it sounds like it would be a bad little motor jumping a 318 to a 390 i think thats quite a bit of a jump way more power than a 360 if u ask me, cuz i mean u stroke a 360 and its a 408 not as much gain as a 318 to a 390. and ya scan that sucker if you dont mind id love to build one and i lookin for all the info to do it cuz i got sevral 318 blocks and a 360 crank layin around
Thanks
TYler

Click to expand...

Now that's what I'm talkin' bout!

muddSlinger3187 said:

i think thats quite a bit of a jump way more power than a 360 if u ask me, cuz i mean u stroke a 360 and its a 408 not as much gain as a 318 to a 390. and ya scan that sucker if you dont mind id love to build one and i lookin for all the info to do it cuz i got sevral 318 blocks and a 360 crank layin around
Thanks
TYler

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1st a 4" crank in a 18 is 384 not 390 it becomes 390 after it's bored 30, now lets think about how you figure the 18 is benefitting more the 18 starts out as a 3.91 bore, the 60 starts out as a 4.00 bore, the 18 starts with a 3.31 stroke the 60 starts with a 3.58 stroke.

so now which block benefits you more the 390 or the 408?

the 360 may be bigger but u hardly ever hear about someone stroking a 318 i think it would be alot more fun to build a 318 stroker than a 360. im not gonna be racing it. it would go in my RC is all. if i was buildin a mopar street racer id go with the 360.
TYler

Bigger is bigger, if you had a 18 and a 60 sitting in the garage the 60 would be the 20" bigger motor weather it's racing or not it is still the 20" bigger motor and a 40 will be another 10" on the 60 after stroking, now if we were talking 400 vs 440 then you want the smaller motor to start with because the smaller motor winds up bigger than the larger motor

i dont have any 360 blocks just a crank and i have 2 318 blocks tht why i thot id build a 318 also
Tyler

Hey my moto is to stroke everything

Nice motto. have u stroked anything?
TYler

Besides yourself! awwwwwwhhhhhhhh shit
Did I say that?