LowDeck451
Well-Known Member
On one of his videos from a day or two ago he’s in a wrecking yard trying to find a 360 Magnum to test performance mods on and try the piston reversal idea. Should be fun!
My question is, are the performance aftermarket piston pins offset differently from a production piston to take advantage of this ‘power gain’? I honestly don’t know but I bet they would do it if there’s a gain to be had.
Yeah, I read it in the Mopar Performance book years ago and have no reason to doubt it, but I’m on the fence about now lol. IIRC, Uncle Tony said the power gain won’t show on a dyno test, but would in a car, and Richard says if it’s true, it WILL show up on a dyno because that’s what a dyno is for. Kinda makes sense lol.Supposedly, yes....but the argument rages on about any power advantage. I've heard of it, read it and seen people do it for so long, you kinda have to wonder if it's not true.
Yeah, I read it in the Mopar Performance book years ago and have no reason to doubt it, but I’m on the fence about now lol. IIRC, Uncle Tony said the power gain won’t show on a dyno test, but would in a car, and Richard says if it’s true, it WILL show up on a dyno because that’s what a dyno is for. Kinda makes sense lol.
OEM is offsetMy question is, are the performance aftermarket piston pins offset differently from a production piston to take advantage of this ‘power gain’? I honestly don’t know but I bet they would do it if there’s a gain to be had.
I agree with this also. I believe you would see gains/losses on a Dyno before you would notice it in a car.Yeah, I read it in the Mopar Performance book years ago and have no reason to doubt it, but I’m on the fence about now lol. IIRC, Uncle Tony said the power gain won’t show on a dyno test, but would in a car, and Richard says if it’s true, it WILL show up on a dyno because that’s what a dyno is for. Kinda makes sense lol.
YesNext question, do the Magnums have offsets?
Why would that be, UT just regurgitates what he hears. As mentioned above other folks have said reversing off set pistons will show a slight power increase for years, this is not new information. Anyone the understands what the ‘ thrust side’ of a cylinder is will understand why. For the guy searching for a junkyard engine to run a test. A well worn bore and piston will not show much change, why? Because the piston and bore are worn and there will be excess piston clearance regardless of how the piston is installed. A meaningful test would require pistons-rings-bores well within new factory specifications.Well, it looks like someone is going to finally put this one to bed...i suppose if there is an inkling of gain Uncle Tony is off the hook...
OEM is offset
Aftermarket is centered
Why would that be, UT just regurgitates what he hears. As mentioned above other folks have said reversing off set pistons will show a slight power increase for years, this is not new information. Anyone the understands what the ‘ thrust side’ of a cylinder is will understand why. For the guy searching for a junkyard engine to run a test. A well worn bore and piston will not show much change, why? Because the piston and bore are worn and there will be excess piston clearance regardless of how the piston is installed. A meaningful test would require pistons-rings-bores well within new factory specifications.
True..... But!!!....And I'll say it AGAIN.......what kind of "performance" engine build uses cast pistons .050 in the hole and a cam so small you dont need valve reliefs?
True for the “LA” engine, not so much for a Magnum engine, mileage dependent maybe? IDK!Only thing I have to say is, junkyard engines are already loose so it would still be a waste of time flipping pistons in one.
Notches At the rear..??I ran a 1971 demon with 340 that had pistons turned around so notches were at the rear...ran super strong but had a ping sound because pistons were coming up and hitting barely....gobs of power and incinerated tires @ 35mph with 727/3000/ man valve body and 3.55's