400 rpm?
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From: Wingo, Ky
400 rpm?
What is the safest rpm you can rev a stock 400 to and not have to worry about blowing it up? I figure 5500, maybe even way lower than that. I think I am going to install a tach on mine so I wont be worried about over revin it.
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If it is all stock, I think you'll find it probably shifts somewhere around 3500 and getting it past 4500 will be a challenge.
If you work it over, & change the cam timing amongst other things, I think 5500 would be max without going through the engine.
Nothing turns an old engine into a bag of broken parts like new speed equipment and high rpms, so consider a proper overhaul and rod/rod bolt upgrade if you're going to spin it hard and spin it often.
If you work it over, & change the cam timing amongst other things, I think 5500 would be max without going through the engine.
Nothing turns an old engine into a bag of broken parts like new speed equipment and high rpms, so consider a proper overhaul and rod/rod bolt upgrade if you're going to spin it hard and spin it often.
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Posting Guru
Joined: Feb 2007
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From: Wingo, Ky
If it is all stock, I think you'll find it probably shifts somewhere around 3500 and getting it past 4500 will be a challenge.
If you work it over, & change the cam timing amongst other things, I think 5500 would be max without going through the engine.
Nothing turns an old engine into a bag of broken parts like new speed equipment and high rpms, so consider a proper overhaul and rod/rod bolt upgrade if you're going to spin it hard and spin it often.
If you work it over, & change the cam timing amongst other things, I think 5500 would be max without going through the engine.
Nothing turns an old engine into a bag of broken parts like new speed equipment and high rpms, so consider a proper overhaul and rod/rod bolt upgrade if you're going to spin it hard and spin it often.
I havent planned on revin it really high or revin it really high often. Just wonderin what the stock limit is so I dont over do it. Thanks
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3750.... when the oink turns to a squeal.....
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it will depen on your setup, anyways the weekest links are your rods which can handle up to 7500rpm so use your rpm range were your motor makes the most of it self...
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From: Coutts Canada
well i've had mine over 7grand (bout 72-7500rpm was all the 750holley dp would let it go to lol), but then again it ain't really stock anymore 
.
The stock motor would go to about 5400-5500rpm with a 4bbl and a 750 holley dp carb as well as a straight up timing set, hei dizzy and headers, with the 2bbl holley (the big 2 barrel, bout 500cfm) it would hit 49-5000rpm.
.The stock motor would go to about 5400-5500rpm with a 4bbl and a 750 holley dp carb as well as a straight up timing set, hei dizzy and headers, with the 2bbl holley (the big 2 barrel, bout 500cfm) it would hit 49-5000rpm.
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From: Coutts Canada
Hollen, i ended up suckin the pan dry and cooked the #1 rod at the crank, so i had to replace the crank, and #1 rod, and rebalance everything, i also damaged the cam as well, i debated replacing it with the same cam or go full roller, long story short is i got cut a deal on the roller conversiom with a cam just a tad bigger than what i was running so i went that route, and i also had to get a high capacity oil pan as well. If all goes well i should be able to pick it back up tomorrow and hopefully get it running again tomorrow as well.
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From: Mariposa, CA
400 rpm
I have a 1979 Bronco Ranger XLT, with a 400ci engine and 172,000 original miles on the clock . yes its short on power( as compared to new) but it still start everyday and goes to work & back (about 30miles a day)with out dieing. It doesn't like anything over 4500rpm. sound like it might come apart if I push it any harder. I guess i'm lucky it still runs!
At any rate it will be my next project. if it stops running I'll just drive a different ford truck, as my Toy*t@ is broken.
Hey what the Hay? were all here to have fun and help each other, right.-RW
At any rate it will be my next project. if it stops running I'll just drive a different ford truck, as my Toy*t@ is broken.
Hey what the Hay? were all here to have fun and help each other, right.-RW
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From: America
im having mine built up a little, but i dont think theres a reason to turn a truck engine over 5500 unless you are a mud bogger, truck puller or some sort of racing. most true truck engines run out of power quite a ways before then.
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Hollen, i ended up suckin the pan dry and cooked the #1 rod at the crank, so i had to replace the crank, and #1 rod, and rebalance everything, i also damaged the cam as well, i debated replacing it with the same cam or go full roller, long story short is i got cut a deal on the roller conversiom with a cam just a tad bigger than what i was running so i went that route, and i also had to get a high capacity oil pan as well. If all goes well i should be able to pick it back up tomorrow and hopefully get it running again tomorrow as well.
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