340 piston I'd question

[nutz]

so pulled the heads on this 72 340 i bought ...been sitting 20? years never started
glad to find no rust inside ...its 30 over (like the guy said)....but can anyone id the pistons
seller said 10.5 : 1 (going to pull them out ) to check every thing ...for my stock 69 build
might just say f-it and use this engine ...i'm trying to build a stock as can be for my 69 dart clone
i do have a 69 340 block .....but its never going to be a #s car

 

[FlamesAreWicked]

Looks like some .030 over TRW pistons per the number stamped in the top

 

[nutz]

anything special ...was going to run stock cast ..just like ma mopar did
guy said steel crank ..that my next place to look
what the hole in the middle for

 

[FlamesAreWicked]

anything special ...was going to run stock cast ..just like ma mopar did
guy said steel crank ..that my next place to look
what the hole in the middle for

That’ll be easy to tell by the balancer.. or looking at the crank if the pan is already off.. that piston number also leads ya to the newer sealed power labeled one..it’s a forged piston. Doesn’t look identical but just what Sealed Power (TRW) makes now.

 

[RustyRatRod]

Stock forged .030 over early (68-71) 340 pistons. Have you never seen any before?

 

[HemiSSDart]

I'd run it as is, looks fine! BTW, looking for my 69 340 block 9B306021...

 

[toolmanmike]

what the hole in the middle for

It's a center hole for a live center for machining.

 

[nutz]

That’ll be easy to tell by the balancer.. or looking at the crank if the pan is already off.. that piston number also leads ya to the newer sealed power labeled one..it’s a forged piston. Doesn’t look identical but just what Sealed Power (TRW) makes now.

no dampner or timing cover....has a deep pan on it but haven't flipped it over yet

 

[nutz]

I'd run it as is, looks fine! BTW, looking for my 69 340 block 9B306021...

been sitting to long not to open it up
i did post the vin of my block i'll look back in my post

 

[nutz]

Stock forged .030 over early (68-71) 340 pistons. Have you never seen any before?

never built anything that wasn't stock ....they are a little to shiney for cast

 

[RustyRatRod]

never built anything that wasn't stock ....they are a little to shiney for cast

Correct, but they are a DIRECT copy of the 68-71 piston other than being forged. I'd run the hound out of it.

 

[nutz]

9b419479
don't think it worth coming to jersey for
if it is a forged crank might just roll with it ....if not i do have one ....
the cam is tight....couldn't even spin it without plyers ....not sure how to i'd that yet it does have purple paint on it

 

[FlamesAreWicked]

On the crank, being a 72, should be a cast external balance crank assuming it’s original. You’ll see the cast parting line on it. The balancer would of had an extra counterweight on it..

 

[RustyRatRod]

On the crank, being a 72, should be a cast external balance crank assuming it’s original. You’ll see the cast parting line on it. The balancer would of had an extra counterweight on it..

Maybe. The cast cranks started in about April of 72 and ran through the end of the 73 model year, so some 72 models got the forged crank.

 

[FlamesAreWicked]

Maybe. The cast cranks started in about April of 72 and ran through the end of the 73 model year, so some 72 models got the forged crank.

Yep.. if it’s earlier, that would be a good bonus. He’ll just have to put some eyes on it since there’s no balancer.

 

[65 Cuda 340]

Maybe. The cast cranks started in about April of 72 and ran through the end of the 73 model year, so some 72 models got the forged crank.

WAY back when, I got a 340 out of a 72 Charger that was less than a year old at the time. It had a forged crank.

 

[Oldmanmopar]

Post some pictures of the crank when you get the pan off. I'll tell you if its forged or cast. Many 72 340 cars had forged cranks. The later 72 car engines had cast. What is the casted in date on the passenger side of the engine?

 

[NC Engine Builder]

Make sure you examine the crankshaft regardless of whether its cast or forged, to determine if it's been ballanced. Those pistons are very heavy, and the rotating assembly MUST be ballanced to those pistons.

 

[nutz]

Yeah i don't know anything about it
Dropped the heads off at my machinist
Don't think it has hardened seats
So might just sell those off and build the O heads
Either way think I need to tare it down and have it balanced....if not a steel crank have one

 

[Dartswinger70]

Is it TRW L2332 or something like that?

 

[33IMP]

Measure the deck clearance before you tear it down. Critical to calculate compression ratio.

 

[Inertia]

You can trim the dome off, to lower compression .
Lowers reciprocating weight a bunch.


I trimmed mine 3 times as fuel/octane declined

 

[Syleng1]

On that 72’ block can you share the stamped in number on the rail? The engine for my car sold out of NY to a guy in Jersey.

And those are some Knarley looking slugs.

 

[RustyRatRod]

I dissent from the crowd on the old TRWs. I LIKE the fact that they're heavy. But as mentioned, get it balanced. After that, you'll have to do something crazy stupid to tear it up.

 

[nutz]

Is it TRW L2332 or something like that?

L2316 ....I think