jfb

I was wondering just for thought purposes how much a 455 olds with h beams and premium pieces plus over 12 to 1 compression and girdeled the rpm it can take also has a nodular crank. this is a built 455 by mondello I have spun it over 6500 often and had no problems either. I also when needed run go go juice.

joepenoso

And the question is.........................???????????????????????

jfb

I posted this above what kind of rpm can a built girdeled 455 take.

380 Racer

From Mondello?

507OLDS

It could be a grenade with the pin missing.
What premium pieces does it have?What are the rest of the parts?

jfb

.040 over with arias pistons etc. eagle h beams etc. clevite bearings and a nodular crank the block itself is very thick still also. plus arp studs etc. studded with arp studs ported edelbrocks. detroit o ring head gaskets the girdle is a main cap girdle. i have spun a few times around 6200-6500 rpm but i really do not know the limit of rpm i guessed 6200 rpm and shifted there. i with a normal build would not go past 5200 to 5500 rpm. I also have oil restrictors and a 8 quart pan plus a excellent high volume oil pump and a jm 4-5 cam plus matching springs etc to handle the load. over 12 to 1 compression and street driven.

507OLDS

Some of those parts were prime in the 80's,but a little dated now.The pistons are good,but on the heavy side.The cam could be replaced with something better,a modern grind. The weight of the rotating assembly plays a major part on how high you should spin it,and how much stress there is. I would have the engine dynoed to see where it makes peak power.That is where I would stop spinning it.There is no need to go beyond that.You can play with gears,converter,and tire sizes to get the car to cross the traps at peak power.

jfb

thanks buddy that is what i look for straight forward advice this world needs more of it. I have run this a few times this year and i am getting some excellent times but dynoing this fall seems like a real good idea by the way my converter and rear gears are pretty well figured out but the slick size might have to be adjusted and my shift point also. I seriously want to science this new combo out before i use the go go juice, I have used all premium parts until now for stability and i want to remain stable period a fast car is not a toy and good luck to you as well, let it roll!

ds00469

Olds engine don't really need to be ran that high. They are torque monsters at low RPM and the safe bet is 5500 to 6000 on a nice rebuild. IMO no need to go higher then 6000 RPM unless you are building it for high RPM.....

Smitty275

My first question to you would be when was this engine built and which Mondello shop? Is it from when Joe owned Mondello Perfomance it should be good to 7k easily. If it is from the modern Lyndello version of Mondello then I wouldn't be overly trusting of it at all. If it came from the Tennessee Mondello shop its probably a pretty good piece and 7k would again be an appropriate guesstimate.
The real question you need to get answered is; where is it making power at? Without head flow numbers and cam specs that's rather hard to predict.
As far as RPM needed for an Olds it all depends on how its built. If you want to go fast it takes power and that marns more RPM. 5500rpm is a good limit for stock piston engines. But when you put a good set of pistons in one you've automatically raised the limit provided you have the camshaft or heads to let it breath at higher RPM. The 5500rpm limit recommendation came about because that is where the stock piston design would eventually fail. They would crack at the slot that was just under the ring pack. The carnage would soon follow. But yes, for a stock factory build 5500 is it. Most factory stock camshafts were well out of wind by then any how as they did make their power from idle to about 4k.

jfb

6200 rpm for a limit with good power it can take more but power drops off.