Anyone use them? I just bought a set for my 438 TT build. My only concern is the 2.0" journal vs the 2.10" I was going to use. With the 4.08" stroke and 2.10" journal I would have had .289" worth of overlap. Now that I am using a 4.05" stroke and 2.0" journal, I only have .254" of overlap. How concerning is that to you guys considering the application which is 7000rpm and 1250rwhp.
Manley 300M rods
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PWR_Andy
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Typically 35-40 HRc from ones I have cut up.
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This is some interesting stuff.
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Back in 1985 we kept having blower drive shafts fail (Quill Shafts). 2.5" diameter 4340 heat treated. Went to VascoMax 250 and the shafts were bullet proof. Each alloy has its uses. Talking to a part time dude does not solve big problems. Jerry Verhill (sp) was our solution. He said that Vasco Jet were the guys to talk with. They apparently have better stuff today, 30 yrs later. Jerry was a former Top Fuel crew chief that switched over to Unlimited Hydroplanes. RIP Jerry. Smart man.
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Bringing a thread back from the dead here. How would 300m rods survive in a 800 hp engine? I keep hearing about fatigue life, does that mean they should be replaced like aluminum rods?
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In my opinion, for the Ford MOD motor, no other rod can compare to the 300M Manley piece in terms of durability.
The record holder for the fastest and quickest MOD motor powered car had this to say about the Manley 300M rods:
"The Manley rod is a serious piece. The original I beam rods lasted reliably up until around 1300 hp. Thus the 300 M rods were designed. There are many other options, Oliver probably being the best, the problem is the wait time. As far as weight is concerned, heavy seems to keep getting mentioned. Just what does that mean and being relative to what? The 4.6 300 M rods are around 650 grams give or take a few. If you look at a comparable Oliver or any other manufacturers rods they simply are heavier. The normal Manley I beam rod is 600 grams. We have reliably made over 1700 hp with the Manley rod and to date have never, ever bent one, broke one , or damaged one. We ran over the weekend in Las Vegas testing with the Pro Stock guys for Pomona. 10 passes between 6.79 and 6.73. Best pass was 6.731 @210.96 The best Pro Stock that I saw was Greg Anderson @ 6.82 @ 203.5 10 passes, 10.7 to 1 compression, 40 psi boost and 9200 rpm shifts, I'd call the Manley rod a good piece for the money.
John Mihovetz"
Another tidbit on the Manley 300M rod:
![Image]()
"This is the first thing we think of when putting high compression and 52 pounds of boost in the same sentence. But what's really important here is the impressive connecting rod--a Manley tool steel, A-beam, Pro Series 300M Lightweight measuring 5.933 inches and weighing a muscular 650 grams--and the bearing, which is still in ready-to-run condition. Fred attributes the lack of bearing damage to the 6.0-liter oiling mod. John had Manley develop this tough-as-nails rod for him; its main claim is its extremely hard material. Fred says it's so tough that it tears up the production tooling, but it's proven bulletproof, even after abuse such as this. In fact, although the piston pin is frozen, the rod and bearing are otherwise usable."
For my future 4.6 Ford MOD motor build, using the $2100 Manley 300M rods is no brainer as I will never ever have to worry about bending or breaking a connecting rod.
The record holder for the fastest and quickest MOD motor powered car had this to say about the Manley 300M rods:
"The Manley rod is a serious piece. The original I beam rods lasted reliably up until around 1300 hp. Thus the 300 M rods were designed. There are many other options, Oliver probably being the best, the problem is the wait time. As far as weight is concerned, heavy seems to keep getting mentioned. Just what does that mean and being relative to what? The 4.6 300 M rods are around 650 grams give or take a few. If you look at a comparable Oliver or any other manufacturers rods they simply are heavier. The normal Manley I beam rod is 600 grams. We have reliably made over 1700 hp with the Manley rod and to date have never, ever bent one, broke one , or damaged one. We ran over the weekend in Las Vegas testing with the Pro Stock guys for Pomona. 10 passes between 6.79 and 6.73. Best pass was 6.731 @210.96 The best Pro Stock that I saw was Greg Anderson @ 6.82 @ 203.5 10 passes, 10.7 to 1 compression, 40 psi boost and 9200 rpm shifts, I'd call the Manley rod a good piece for the money.
John Mihovetz"
Another tidbit on the Manley 300M rod:
"This is the first thing we think of when putting high compression and 52 pounds of boost in the same sentence. But what's really important here is the impressive connecting rod--a Manley tool steel, A-beam, Pro Series 300M Lightweight measuring 5.933 inches and weighing a muscular 650 grams--and the bearing, which is still in ready-to-run condition. Fred attributes the lack of bearing damage to the 6.0-liter oiling mod. John had Manley develop this tough-as-nails rod for him; its main claim is its extremely hard material. Fred says it's so tough that it tears up the production tooling, but it's proven bulletproof, even after abuse such as this. In fact, although the piston pin is frozen, the rod and bearing are otherwise usable."
For my future 4.6 Ford MOD motor build, using the $2100 Manley 300M rods is no brainer as I will never ever have to worry about bending or breaking a connecting rod.
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