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#41
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You'd have to turn it down .100" to get .050" clearance, just sayin'. ;D
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#42
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Years ago I pulled the 455 out of my car I raced for a freshening and found one of the ears broke off the oil pump shaft where it goes in the distributor. I figured I dodged a bullet there before a major failure.
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72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007 (cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD 1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.64 @ 87.3 mph on slippery street tires.Bad 2.25 60ft.Owned since 86' |
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#43
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I was on Amazon the other day and checked out M54DS and IS54A and it said Country of origin China. I hope Melling not making this stuff oversea now. ?? But if your worry about running a oil pump drive rod get it Cryogenic Paul Carter has a price list on his web site it’s $3 a couple years ago (maybe 5-7 dollars now today) but cheap insurance.. also most engine builder can tell you a local place that will cryogenic freeze your part
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#44
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I think there is a place in Worcester, MA. I am going to get the internals of my TKO done there.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule. |
#45
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Yep, that's how dad's last 455 got smoked. Broke the ears off one of those aftermarket shafts after 4-5 years of use. Just one of those odd deals.
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#46
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Quote:
https://forums.maxperformanceinc.com...d.php?t=553318
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72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007 (cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD 1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.64 @ 87.3 mph on slippery street tires.Bad 2.25 60ft.Owned since 86' Last edited by scott70; 06-04-2021 at 08:19 PM. |
#47
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Quote:
Yeah ,it's not as easy to turn a tapered section at each end of the cut, but good engine building isn't about 'easy' . Each to their own I suppose. |
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#48
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ps, turning down an oil pump driveshaft by .050" means taking a .025" cut, that's .025" off each side - not .050" off each side!
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#49
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Quote:
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If .025" will get you the clearance you need from the crankshaft then the smallest portion of the oil pump intermediate shaft will be .050 smaller. Both saying the same thing but using different numbers for the clearance to the crankshaft. I have to agree that unless you have the right radiused cutter to add a fillet to both sides of the cut, you made the oil pump drive piece much weaker. Then when the piece fails, as been mentioned above, you can replace the rotating pieces with a crank that has been checked for oil pump shaft to counter-weight and reduce the diameter of the counter-weight before balancing the crank. Now you can run a proper diameter oil pump drive part that has been heat treated..... Not that hard to remove a crank on a engine stand, even if you left the rods and pistons in the block. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#50
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Just like reworking any type of metallurgy so cracks can not form, I always polish and slightly round off the drive ears on the shafts .
It makes me wonder if this simple process would have kept you folks who have experienced this type of failure from having such even if the shaft was made off shore?
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#51
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(double post)
Last edited by adynes; 06-05-2021 at 09:23 AM. |
#52
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#53
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The tang drive worries me the most. Out of all the pump shaft failures I've seen it's always been the tangs that fail.
That turn down shaft doesn't really bother me. Like I said, millions of 400 SBC's built using a shaft that looks just like that, and GM didn't bother to radius them or taper the cuts either. Haven't seen an aftermarket one done for that application that way either. Not that it isn't a bad idea, certainly treating it to a radius will only strengthen it, but the factory never bothered to do it :shrug: If it survived a 1000hp race engine turning over 8000rpm and setting world records, and came out looking that good, I'm sure it'll be fine. |
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#54
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Quote:
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“It takes considerable knowledge just to realize the extent of your own ignorance.” Dr. Thomas Sowell |
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#55
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I have to smile when I read about hundreds of 1,000+ HP 1/4th mile runs without a failure.
As posted in the past, run the engine at max power plus 10% for hours at a time for over 400 engine hours and then you can brag about the durability of engine parts. Just saying. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#56
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This thread reminds me of the one a few years ago when all the "Internet" experts explained how "wrong" it was to build an engine with pressed in rocker arm studs.
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#57
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Wouldn't GM have done that already before putting millions of 400 SBC's in production?
Doesn't the millions of them on the road in passenger cars, and millions of them in truck applications since 1970 account for some level of durability? I think the whole process is being overthought and too many people on this forum live a sheltered life. |
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#58
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Quote:
Just trying to help the OP out. Sometimes the worst thing you can do is ask for advice on the Internet. I'm no oil pump drive shaft expert, but posted the first hand information I had to help the OP. At the end of the day he has to do what he needs to do so he can sleep at night. "He" also has to deal with the consequences of his decision. It's real easy to sit behind the key board and preach how everything needs to be done text book perfect but a whole bunch harder to get off the sofa and get something done. You ever notice how the guys with the shortest list of first hand accomplishments know the best way to get the job done! |
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#59
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#60
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Last edited by PAUL K; 06-05-2021 at 11:20 AM. |
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Closed Thread |
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