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Old 12-02-2003, 11:17 PM
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big block olds RPM?

what would u expect an Olds 455 (bored 60over) with port/polish heads, headers, true dual exhaust/X-pipe, 650cfm doublepumper, forged aluminum pistons, stock conn. rods, stock crank to be able to reach safely RPM-wise?........my cam's powerband (.496/.520 224/234) can exend past 5500 if i advance it 4degrees, but im not really sure it could reach that, im personally expecting about 5000, but i dont have actual experience with it, so thats only an educated estimate...........somebody with personal experience with a moderatly-modded 455 would be a big help, because my main concern is not where my power is made, i would prefer my power to be as low-end as possible, however with a TH400 and 5000rpm, i would need like a 3.23rear or numerically lower to prevent screaming on the highway, i would really like to be able to push a 3.55, but as i said, with only 5000 that is not practical at all......thanks alot

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Old 12-03-2003, 12:33 AM
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Your asking a block with a 4.25in stroke to turn over 5500 RPMs? aaaa... NO.

I'm mean I'm sure you can but you wont like what happens. Olds blocks arent meant to turn high RPMs, they are meant for low end torque and should have a cam that reflects that, like something around 260X270 adv dur. with a lift of around .500. Running such a high RPM cam like yours in the 300's is not a good idea if you are looking to keep it alive.

With an olds motor, you need a cam to exploit low-mid range power, a rear end to take advantage of that (say 3.37) and a tranny that has a good set of gears "WITH" an overdrive like a 2004R so you arent stuck with a car that doesnt like pushing past 100-120mph.
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Old 12-03-2003, 01:18 AM
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i dont nkow the exact adv.duration, but i know it is right around 260/270...nowhere near 300, i would never get that, i hate duration.....and i also do have right around .5 lift (.496/.520)......so i have exactly what u suggested..........as for the tranny, i dont believe a 2004r can withstand for a long period of time with the kind of torque im pushing (3 different comp dyno tests estimate that ill have between 500-550ft/lbs at flywheel)without being heavily modified ($$$, and i already have the TH400), now if 2004r can defiantely handle that i would most certainly get one



again, im not looking for help to build up my powerband, i know what im doing....i just want to get actual facts from people who have built this type of motor and what rpm's there were able to push so i can get an idea of what kind of rear i need to get
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Old 12-03-2003, 01:38 AM
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Well I decided to go with the 403 instead of the 455 backed by a 2004R and the 403 will be pushing about 425 ft lbs at the flywheel so I think it's safe to say the 2004R can stand it The 2 major parts that need replacing only cost $15.00 each and a rebuild kit for $180.00 will get you a 4 speed that can stand up to that abuse. With a TH400 you WILL need that set of 3.23s or lower, trust me my uncle has a 454 backed by a 350 in his truck with 4.11s in the rear and it "screams" at 75mph even with a 3rd party over-drive on.

As for the Engine RPMs, like i said, I wouldnt push it past 5500. I making the redline goal for my 403 5500-6000 even though I will never rev it to that.

If your cam is in the 270s 280s dur. than yes you can advance it for some extra mid-range torque, at the cost of some HP.

And to get an extra few horses get yourself a set of total seal gapless rings! Yes I have to promote them. hehe.

Edit: oh yeah the dur on my 403 is 280x295, just a bit too high, but thats what they had in stock.
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Old 12-03-2003, 03:10 AM
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Advancing a cam usually LOWERS the powerband. Retarding the cam raises it.

Advanced is the way to go on an olds BB.

They top out around 5500... 5000-5200 is safer.

I have dyno sheets from an olds 455 that put down 503hp/575tq, and the hp peak was at 5200rpm.
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Old 12-03-2003, 08:58 AM
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wow, thats f*ckin awesome news that the 200r4 can handle this kind of power......anybody need a running, but not perfect condition th400??? hehe


yeah, 5500 is my goal, my max hp is approx 420@5000, but my powerband doesnt really start to drop till close to 5500.....if i can run that, id be very happy but i realize anything higher than that is way out of my league (im 18 with a couple grand to work with)....

also, does anybody happen to have the ratios for 200r4?
thanks alot

what do 3rd gen firebirds come with? 200r4 or 700r4..........thats the car im putting this engine into, so i might be having the tranny i need right outside my house waiting for me

Last edited by Rocket455; 12-03-2003 at 08:58 AM.
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