454 Max RPM?

[blazin_blazer]

i have a buddy with a mild 454 in a jet boat that runs 6K rpm, until the mechanical fuel pump won't keep up, and it sucks the carb bowls dry...puttin elec. fuel pump in this winter...should hold a sustained 6K rpm....

my boat has a 455 olds in it and if i rev over 4K rpms, it stacks rod bearings, done it 3 times...when i pop this 1, i'm going to put a 350 olds rocket, that i'm workin on, in it...it should hold 5K rpm, and my parts will swap to it...then next 1 will be LT1...w/ over transom bassett headers!

its all about rpms spinning the impellar on the water...

another friend races nhra sportsman and he has a 454 thats destroked to about 340 cid..projected rpm...10K, but 80K $ motor :-O

 

[LVJimmy]

455 bearings

i have a buddy with a mild 454 in a jet boat that runs 6K rpm, until the mechanical fuel pump won't keep up, and it sucks the carb bowls dry...puttin elec. fuel pump in this winter...should hold a sustained 6K rpm....

my boat has a 455 olds in it and if i rev over 4K rpms, it stacks rod bearings, done it 3 times...when i pop this 1, i'm going to put a 350 olds rocket, that i'm workin on, in it...it should hold 5K rpm, and my parts will swap to it...then next 1 will be LT1...w/ over transom bassett headers!

its all about rpms spinning the impellar on the water...

another friend races nhra sportsman and he has a 454 thats destroked to about 340 cid..projected rpm...10K, but 80K $ motor :-O

I used main bearing straps, I beleive from Mondello, never had much problem with the rod bearings just the mains and the engine was run over 4K RPM for hours.

 

[blazin_blazer]

i stacked my mains once, the other 2 times..stacked the rods...main strap?...mondello&google i'm on my way... when u say main strap...r u talking about the same thing i see for chevy's that they call a girdle? a piece that bolts to every main bolt....i'd love to find a fix for the olds....as i've priced parts to convert the boat to a chevy engine and ouch!

 

[Ned Kelly]

I've had the stock 454 in my truck since 1989 (RV torque cam is only mod). I've hit 5100rpm once but only for a moment. I don't recall pushing it over 4000-4200 any other time. Power is in the lower rpm's.

Works great as a mud/snow truck with th400/np205/4.11 diffs/39.5" Swampers. Usually I use low range, 2nd gear. I wouldn't change it, works too well like this. Very good as daily driver. Like I said, for mud/snow and dd. On the highway I cruise 2200rpm -2600rpm. The cam spec card said best highway cruise is at 2200rpm. You don't need rpm's for these engines, unless you go to certain performance cams. It's also good to be able to use regular fuel, therefore you don't want something like a 10:1 compression engine. Mine is only 9:1 and performs very well.

Check out something like Crane Cams website and I think they list what is optimal rpm power band for whatever cam you select. High torque low rpm cams usually don't require valve train, headwork, high stall torque convertors, big carbs, or intake manifold upgrades. Also low rpm cams/mild cams let your engine operate without being 'finicky' and in all weather conditions (like hot summers and very cold winters, and retain very good all round driveability and decent economy), with good power through most of the rpm curve.

 

[Bogger Man]

I don't run mine much over 4 grand for any long amount of time, about 5 in short bursts. I had a lead foot before I rebuilt it because of spun bearings. Big Blocks = Big Wieght, if you got the money have it balanced.


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