Troubles taking a 360 .060?

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siuauto

siuauto

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I have some 4.060 pistons and rods that I want to use on a engine and debating on a 340 or 360. I would prefer to use the 340 but it seems to be difficult to find a 340 in either a standard bore or a ready to go .020 340 (4.060 bore). I could use a 360 but curious if anyone has issues with their blocks that prevented them to bore that much. I know I will need to get it sonic tested but if everyone is having issues going that big, there is no reason for me to explore that route.

Thanks in advance.
 
Some can and some it's best not to. The only way to be sure is to have the block sonic checked.
 
I believe that it is early 360 blocks that have thicker cylinder walls, but I don't know what the preferred years are.
 
Sonic check it. Never mind any other post saying there’s didn’t, ignore what you have read, ignore ignore ignore!

SONIC CHECK IT!
 
str12-340 said:
I believe that it is early 360 blocks that have thicker cylinder walls, but I don't know what the preferred years are.
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Sometimes. Even those it's best to sonic check.
 
siuauto said:
I have some 4.060 pistons and rods that I want to use on a engine and debating on a 340 or 360. I would prefer to use the 340 but it seems to be difficult to find a 340 in either a standard bore or a ready to go .020 340 (4.060 bore). I could use a 360 but curious if anyone has issues with their blocks that prevented them to bore that much. I know I will need to get it sonic tested but if everyone is having issues going that big, there is no reason for me to explore that route.

Thanks in advance.
Click to expand...
 
well 360 even biger chank rod ratio is for fun . 360 was a low end torque and speed use the 360 u can get any ratio as com pression . and o any . hith head x u any 340 . but sir 360 is as mopar wants . tuff and go for it.
 
70aarcuda said:
Got one early 360 that is .070....
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And by stark contrast, I did a 416 from a 77 360 that was .070 over. So you never know. It was sonic checked and could have gone .100 and had more room. Sonic testing is well worth the money.
 
charles mill said:
well 360 even biger chank rod ratio is for fun . 360 was a low end torque and speed use the 360 u can get any ratio as com pression . and o any . hith head x u any 340 . but sir 360 is as mopar wants . tuff and go for it.
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Good to see you posting Charles. You doin ok?
 
I went .060 over with a 77 block. Im not saying you should or anything like that but I did. I will let you know how it works out. Lol my block didn't clean at .040 and the machinist said there was plenty still there to go .060. As far as I know he didn't sonic test it. He just used his eyes and 60 years of experience and made a judgment call. And I trust him so we shall see what happens.
 
charles mill said:
well 360 even biger chank rod ratio is for fun . 360 was a low end torque and speed use the 360 u can get any ratio as com pression . and o any . hith head x u any 340 . but sir 360 is as mopar wants . tuff and go for it.
Click to expand...
I will be using a 3.79" crank so my rod ratio will be better. My pistons are set up for that stroke. I have a set of trick flow heads and will be set up for a roller cam. Topped of with Victor manifold and Sniper Stealth FI.
 
i have 10.5 340s but the 360 and using u and x 340 heads walk and talk . point i have . but take a 318 340 360 heads and intakes are great.
 
siuauto said:
I will be using a 3.79" crank so my rod ratio will be better. My pistons are set up for that stroke. I have a set of trick flow heads and will be set up for a roller cam. Topped of with Victor manifold and Sniper Stealth FI.
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What height pistons?
 
RustyRatRod said:
And by stark contrast, I did a 416 from a 77 360 that was .070 over. So you never know. It was sonic checked and could have gone .100 and had more room. Sonic testing is well worth the money.
Click to expand...

On average, what does sonic testing cost? I just don't want to spend a bunch of money buying a bunch of blocks to have them all sonic tested if none of them will work, but it sounds like some have had their blocks to .060 over so it looks like it might be worth my time.
 
siuauto said:
I have some 4.060 pistons and rods that I want to use on a engine and debating on a 340 or 360. I would prefer to use the 340 but it seems to be difficult to find a 340 in either a standard bore or a ready to go .020 340 (4.060 bore). I could use a 360 but curious if anyone has issues with their blocks that prevented them to bore that much. I know I will need to get it sonic tested but if everyone is having issues going that big, there is no reason for me to explore that route.

Thanks in advance.
Click to expand...
360 up compression . 318 and 340 r 10.5 point rod ratio better on 360 why it was built.
 
siuauto said:
On average, what does sonic testing cost? I just don't want to spend a bunch of money buying a bunch of blocks to have them all sonic tested if none of them will work, but it sounds like some have had their blocks to .060 over so it looks like it might be worth my time.
Click to expand...

Let me answer that by asking a question. WHY do you want to go .060 in the first place?
 
RustyRatRod said:
Let me answer that by asking a question. WHY do you want to go .060 in the first place?
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my buddy gave me a great deal on a set of Molner rods and it has a set of 4.060 ractec forged pistons on them that are set up for a 3.79" stroke and I thought if I could use them it would make a killer small block.

I know, I am kind of working backwards... story of my life
 
siuauto said:
my buddy gave me a great deal on a set of Molner rods and it has a set of 4.060 ractec forged pistons on them that are set up for a 3.79" stroke and I thought if I could use them it would make a killer small block.

I know, I am kind of working backwards... story of my life
Click to expand...

Understood! Sometimes that's how you do it.
 
siuauto said:
my buddy gave me a great deal on a set of Molner rods and it has a set of 4.060 ractec forged pistons on them that are set up for a 3.79" stroke and I thought if I could use them it would make a killer small block.

I know, I am kind of working backwards... story of my life
Click to expand...
Nothing wrong with that.
 
The 1989 LA roller 360 I had sonic checked for a safe bore up to .070 over...so you never know what you’re gonna get.
 
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