Can I use 340 standard pistons and rods in a 360 engine block my block has to be bored 40 over any help is appreciated thank you
340 pistons and rods in a 360
- Thread starter Bigboy 68
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70bigblockdodge
Active Member
No piston compression height is different because of the stroke difference.
Thanks
71-440-Duster
Well-Known Member
I think you’ll find the compression height far too different for this to work unless you had custom rods to make up the difference.
I thank both you gentlemen you have answered my question
Professor Fate
Push the button, Max...
You have to start with the later '72-'73 low compression piston. Shave the top and cut the skirts for crank clearance. Called a Hoover motor, after Tom Hoover.
Lots of threads about it.
340 pistons in a 360? | For A Bodies Only Mopar Forum
Tom Hoover 360 | For A Bodies Only Mopar Forum
Same answers as last time
360 block help thank you | For A Bodies Only Mopar Forum
Lots of threads about it.
340 pistons in a 360? | For A Bodies Only Mopar Forum
Tom Hoover 360 | For A Bodies Only Mopar Forum
Same answers as last time
360 block help thank you | For A Bodies Only Mopar Forum
The articles I've seen used the TRW low compression pistons with the .300 thick crown milled down to 3/16 thick with a bevel (I think 45 degree?) cut from the top ring land to the crown. It's usually cheaper to buy hypereutectics that already fit if they're available unless you have a small home mill and the skills to do the work to fixture a piston into it.
Gentleman I thank you for all the replies my question of can you use 340 pistons in a 360 has been answered I will just look for a set of 360 Pistons thank you very much
AJ/FormS
68 Formua-S fastback clone 367/A833/GVod/3.55s
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An acquaintence/ sortof friend, of mine, said he did it, many years ago. I believed him........... but his Demon was still slower than my Barracuda. Yes he did, have a machine shop.
Hoover did what he did way back when there were no off-the-shelf inexpensive zero deck pistons for a 360. Now there are.
It's not my first choice (I like 1/16 rings and forgings) but it is in stock
DODGE KB KB107-040 Keith Black KB Performance Pistons | Summit Racing
DODGE KB KB107-040 Keith Black KB Performance Pistons | Summit Racing
That answer is yes if the stroke is the same. If you have a 360 main crank but have the stroke of a 340, then yes.
Stick the 340 pistons & rods (all rods the same length!), the extra stroke the 360 has over the 340 (3.58 - 3.31 = .27) leaves the high compression pistons way to high.
The KB mention of the Hyperutecic slugs (KB 107) also have a forged counterpart, FWIW.
Cranks are available with the 360 main and the 3.31 stroke. IDK know if you have a machinist that would know or can regrind the crank. Which is not a bad option and relatively inexpensive.
Good luck with the build.
So Rob just to be clear I can get a forged steel crankshaft 3.31 stroke with 360 mains and I can use my forged standard bore 340 Pistons and my Factory 6:45 340 rods also I would like to know can I internally balanced this assembly your help is appreciated thank you
IF! You can get a forged (or cast) steel crankshaft (with) 3.31 stroke with 360 mains, then yes you can use the 340 slugs. A machinist will tell you if he can cut the stroke down. This crank used to be offered. IDK if it is still available.
The balancing job can and should be done internally.
All small block rods are the same length. There “Girth” are bigger on the 340 & 360 engines.
The balancing job can and should be done internally.
All small block rods are the same length. There “Girth” are bigger on the 340 & 360 engines.
Sorry if I posted a confusing message. I just re read what I wrote. I’m a bit scattered in my thoughts. My bad, very sorry about that. I’m normally a good bit clearer.
No problem at all Rob I thank you very much for the information just trying to use up some spare parts for a 360 block that I was given have a good rest of your night and a good rest of your week
Bob, I don’t have all of my books at my fingertips, I could have sworn there was a 360 journaled 3.31 stroke crank once available but I can’t find it and I think I made a mistake in saying there was.
Check with a crank grinder to see if he can regrind the 360 crank throws down. But this may turn into an expensive endeavor I don’t recommend.
Check with a crank grinder to see if he can regrind the 360 crank throws down. But this may turn into an expensive endeavor I don’t recommend.
Get crank spacers and run your 340 or 318 crank in a 360 block and use items u mentioned.
Thanks man. I think I’m ending this night early.
Moving is a PIA
Moving is a PIA
Hughes engines has them. IIRC, there made by….wait… nevermind, bed… bed… must out FABO DOWN! Bed… bed… bed….
There was a Mopar Performance 3.31 inch stroke with a 360 main forging (and a cast crank too!) available but you would probably have to find a used one now.
Okay good night have a good one
pishta
I know I'm right....
The 318 low comp truck pistons can fit on a cut down (318 size) mains 360 crank with open heads and some fatty .090 cometics. Take a little off the edge of the piston and your good to go.
Ramracingengines.com
emailed his 2 days ago and he has them in stock for $388 plus shipping
emailed his 2 days ago and he has them in stock for $388 plus shipping
What did he email two days ago??
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