The original pistons have mated into that bore, new pistons are a hit or miss with maybe a tolerance difference. You will most certainly have to balance the assembly.
Today, dollar for dollar, is the 318 faster than the 340 ???
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You’re Just blowing ‘hypothetical’ smoke my friend
justinp61
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Well I read what I posted and realized it was 7500 rpm, my bad should have looked at it better. Stock X heads no porting other than a 3 angle valve job, stock size valves. Only allowed factory spec pistons with 5/64 ring pack, stock rods, stock stroke crank (318). Intakes is the factory cast iron for a Thermo quad, nothing changed on it either has to have the choke. Cam is any duration with stock lift for the 340 (.450 I think) can be solid lifters now. Stock style springs and stock retainers, 273 adjustable rockers. Any header. Watch one of these cars in action (standing on the back bumper) and you’ll be blown away. The 318 cars from 78-85 can use the same pieces but smaller cam and they’re down 5-6 classes running mid 12s. They can’t compete with the 340 but still run on their index. Biggest tire allowed is 9” wide. If the 318 could do what is being said it would be out there
Dave_J
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OK I'm stupid.
The new pistons were within 5-6 grams so a HUGE miss match. Edited The compression height between the stock and the new pistons was a lot but the skirt was shorter from measuring centerline of the wrist pin. Both wrist pins weighed almost the same. These were DC 9.5 pistons in stock bore size. Came in Std, 0.030", 0.040" and 0.060" and were cheap at the time.
Something tells me the FACTORY balance was not near perfect by any means.
But this was a Truck 360 so no race car tolerances require.
You win. We all can go home now.
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Dartswinger70
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I saw x heads on E bay going for 2 grand yesterday...rediculous.
Dartswinger70
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Yeah... Its a bench racing thread...There seems to be a lot of that in this thread.
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Dartswinger70
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Hey so, I was thinking, based on the logic in this thread, I ,say through a combination of parts , bore and stroke, run a Small block Chevy as long as it mechanically equated 340 cu in displacement? Chevies have always been "cheap"
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mygasser
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so a 305 (less than 3 3/4 bore stock) with a 3.75 stroker kit gets 334 ci at 30 over, so it'd need to be 60 over to make it a 340? mmmmmm..... that sounds niceHey so, I was thinking, based on the logic in this thread, I ,say through a combination of parts , bore and stroke, run a Small block Chevy as long as it mechanically equated 340 cu in displacement? Chevies have always been "cheap"
you're right though, cheap
360? I thought we were talking 318? NOW a 360 can do ALL of what you been saying. Totally agree
Dartswinger70
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...yeah just trying to "sneak around" the finance restrictive rules, it's an instinct by now for me LOL!so a 305 (less than 3 3/4 bore stock) with a 3.75 stroker kit gets 334 ci at 30 over, so it'd need to be 60 over to make it a 340? mmmmmm..... that sounds nice
you're right though, cheap
mygasser
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me too, it's why my valiant has an explorer axle now
Dartswinger70
Well-Known Member
The Ford Trac Loc? not a bad choice, they are fairly staright forward to rebuild and the clutch pack replacement isn't bad either. You can get the clutch kit from Ford Motorsports. I am thinking about a 3:73 upgrade to my Fox body, i have the stock 2:73s now and my launch off the line at the track is a challenge, however, plenty of top end on the highway, I like "flooring it " when the Nissans try to pass me at 80-90 MPH I like to make 'em work for it, most people back off before 100 MPH I dunno why. This is on the street Highway. Top end speed is about who backs off first.me too, it's why my valiant has an explorer axle now
448Scamp
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Did you put a bore gauge in the hole or just eyeball it? There isn’t any cylinder I would run today that was any factory bore. Crosshatch means nothing because it’s most likely wrong for today’s rings. Factory bore geometry was horrible. That’s why you bore a cylinder. To get it correct, and the factory finish was marginal in its day. In fact most guys today don’t measure their finish and they have no idea how much they could improve the finish if they measured it.
Dartswinger70
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If we are talking "modern" engines yes, the old La is more forgiving. The Ford Modular V8 ,for example is easy to screw up, with home and or old machine shop techniques. The tolerances and machine surfaces are much more minute and specific. I have seen a Ford 4.6 where the head gasket wouldn't seal because of .001" imperfection on the deck surface. On an old cast iron engine (such as he LA) if someone chances a home hone and re ring what's the worse that will happen? oil getting past the rings? it will be obvious, then pull it out and get it bored. If the rings seal and there is compression it can be ran, how many actual miles a year are put on a Classic car? I venture to say car show guys "might" put 10 thousand miles a year on their engine on the other hand if you are racing the engine and want "blueprinted" clearances, than yes go all out . for a classic car show guy to dump all that money into an engine he wont wear out, hes just leaving it ( the money spent on all that blueprint work) for the next guy to get for cheap.
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mygasser
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yep, lsd, 31 spline shafts and disc brakes all stock. a nice hd piece really. and mopar 4 1/2" 5 pcd too.
Dave_J
Well-Known Member
The way way post above about paying to hanging new DC pistons on my old 360's rods was an answer to the post above it about costs. It costed the same EACH to R&R pressed pin pistons on a 2.2 as it is for a 318, 360, 383, 440.....
All the work was done (20-25 years ago or so) at a well known Machine Shop in Auburn that does many NHRA team's engines, DG Machine. I did have a lot more done to that E58 360, Decks were way off so it was shaved 0.030". Heads were LIGHTLY ported at home just to get the huge lumps and cast marks out, then rebuilt without ex rotators at his shop.
That engine came out of a wrecked Washington State Patrol 1987 'Diplomat' with 45,000 miles. It went in to 66 Dodge Dart Wagon for two years then in a 1975 B200 HIPPY van with a OD 883 and lived for another 150,000+ miles. The lady still has it and is still a Hippy but she still has a lead foot too.
All the work was done (20-25 years ago or so) at a well known Machine Shop in Auburn that does many NHRA team's engines, DG Machine. I did have a lot more done to that E58 360, Decks were way off so it was shaved 0.030". Heads were LIGHTLY ported at home just to get the huge lumps and cast marks out, then rebuilt without ex rotators at his shop.
That engine came out of a wrecked Washington State Patrol 1987 'Diplomat' with 45,000 miles. It went in to 66 Dodge Dart Wagon for two years then in a 1975 B200 HIPPY van with a OD 883 and lived for another 150,000+ miles. The lady still has it and is still a Hippy but she still has a lead foot too.
Dartswinger70
Well-Known Member
I knew a feller who had a 440 in a B series van. At the time i was like "does it fit?
Dave_J
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One place to have picked up a well maintained 5.2 or 5.9 was at auction of the GTE and Verizon Telephone vans. They got 2,000 mile or 6 month oil changes. Also A999, A500's and A518's too.
Our Kirkland WA GTE Garage would send them off at 110,000 miles or 6 years old.
B vans are Uni-Body.
Anyone remember these?
Our Kirkland WA GTE Garage would send them off at 110,000 miles or 6 years old.
B vans are Uni-Body.
Anyone remember these?
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Dartswinger70
Well-Known Member
110,000 isn't bad on these
Fuel injected engines.
Fuel injected engines.
@318willrun
I had to unsubscribe to this thread. ....
Thank you to the OP for the topic.
It was an interesting question and topic, and a decent discussion for a while but its just got stupid after a while. ....
On to bigger and better things!
Jeff
I had to unsubscribe to this thread. ....
Thank you to the OP for the topic.
It was an interesting question and topic, and a decent discussion for a while but its just got stupid after a while. ....
On to bigger and better things!
Jeff
Completely understood. I really meant for this to be a reality check as to what has happened in our hobby. The price that the collectors/restorers, and even racers have placed on a 340 has rocketed. Not that it's a bad thing. But it puts in perspective that the lower end builder is probably not going to be shopping for a 340. It was my whole point, using the "boat anchor" 318 as the source for the foundation of the topic. Obviously, some took that as a "threat" or "hate", or "disrespect" towards their beloved and that couldn't be further from the truth. And nothing more disrespectful to some than to line up a common 318 to the beloved. The 340 always has been and always will be one of my favorite small blocks produced by any manufacture during that era of time.
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NC Engine Builder
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Well, once again, you left out the 360, which was produced from 71 till 93, far outpacing the number of 340s out there. A REAL budget hotrodder is gonna choose the equally cheap 360 core...not a 318. It's a skewed argument, with unrealistic limitations on what's available in ANY wrecking yard.
Dave_J
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There are 1,000s of 318 posts and 1,000s of 340 posts and 1000s of 360 posts.
Why can there be a stand alone 318 VS 340 post?
If you gave me a 340 and a 360 free to do what I wanted to, I'd sell the 340 for $$$$ and use the $$$$ to build the 360.
Of the engines in my sons or my garage I can pick from 2.2, 273, 318, 5.2, 360, 5.9 and 400. If I were going to do a full build from one of those, it will be a 5.9.
But I am 3/4 the way thru a 410 Scat stroker 5.9 so there's that.
I do not even have a 318 or 5.2 here, they are 30 minutes away at my sons garage. He also has a 4.7 Stroked 4L 91 Jeep Larado that will smack down most 5.0 Rustang's running around his neighborhood.
Why can there be a stand alone 318 VS 340 post?
If you gave me a 340 and a 360 free to do what I wanted to, I'd sell the 340 for $$$$ and use the $$$$ to build the 360.
Of the engines in my sons or my garage I can pick from 2.2, 273, 318, 5.2, 360, 5.9 and 400. If I were going to do a full build from one of those, it will be a 5.9.
But I am 3/4 the way thru a 410 Scat stroker 5.9 so there's that.
I do not even have a 318 or 5.2 here, they are 30 minutes away at my sons garage. He also has a 4.7 Stroked 4L 91 Jeep Larado that will smack down most 5.0 Rustang's running around his neighborhood.
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