oldsmobiledave

have been asked many times what the bore & stroke combinations were for my two stroker engines. In the past I have not revealed them as I had promised my engine builder that I would not reveal the details. His reasons for not revealing the bore & stoke were entirely his own. I gave my word & I kept it because that is what I was taught to do.

I am now at liberty to disclose the details as the engine builder feels he no longer needs to keep these details to himself. If you have questions feel free to call Wayne Joss @ Joss Engines in Lethbridge AB 403-320-7272. Wayne has built Olds engines for other forum members & Olds racers in Alberta & he is happy to discuss the builds with you.

My engines are not the biggest, not the strongest, not the fastest. They simply are pump gas friendly big displacement engines. I am posting this information for those who want to know details about what other stroker combinations are out there beyond the 434 SBO & the 496 BBO. Is a 496 better than a 524?. Maybe. Is a 434 better than a 470?. Maybe.

Both engines run 11.2:1 compression with victor intakes, The 524 has a 1050 dominator with a solid lifter cam. The 470 has an 850 AED carb & uses a flat tappet cam. Both engines would make more power with more compression & roller cams but I enjoy using 94 octane pump gas.

The 524 is actually 523.7 cid & measures 4.280" x 4.550". The crank is a factory steel 455 in an irrigation block.
It made 662hp @ 4900 & 704 TQ @ 4875 on the engine dyno when new.
I do not have the chassis info at hand.


UPDATE. I found some chassis dyno numbers from the 524 but I am not sure from when these dyno numbers came (it has been on the dyno numerous times).
571.6hp @ 5155 and 606.6TQ @ 4900.

The 470 is actually 469.4 cid & measures 4.168" x 4.300". The crank is a factory steel 425 in a diesel D block.
It made 555hp @ 5450 and 552TQ @ 5100 to the ground on the chassis dyno.
I do not have the engine dyno results at hand (I am out on an oil rig until the end of Jan).

Again I am just posting to share info & I am not pretending that I am an engine builder because I am not. I am sure that some of the many engine builders on here will find fault with my builds and that is OK. These engines serve me well & I am happy with the power that they make for the money that I paid.

Some will be surprised by the long stroke of 4.30" in the 470 small block. If you need details on how to make that work talk to Wayne.

I hope some of you find this information useful.

young olds

a 4.128 bore with a 4.550 stroke is 487ci not 524 however the small block does add up. Im not trying to say anything, just saw the measurement and thought to myself that it didnt sound right for that many cubes. but that hp and tq on pump gas is good no matter what

oldsmobiledave

Sorry for the typo. The Bore & Stroke of the 524 is 4.280" x 4.550".
I fixed it above. There was a 1 in front of the 280 that should not have been there. Damn sausage fingers.

cutlassefi

Thank you for the info. I appreciate it but I just wanted to clarify any potential misconceptions.


Thanks again.

wr1970

Wow 428 bore! I thought 4.25 was max for a 455! Otherwise the cylinder walls would be to thin.Dave any block fill in that 5.24 ci?

oldsmobiledave

No block fill.


Of possible interest to some is that this 455 block was an irrigation pumping unit prior to being used to make the race engine (Wayne builds & services industrial pumping units).


As an aside I have a .921 lifter bore 425 from a '66 Toro that is already bored to the same dimensions. It is my back up block but I have never needed to use it (fingers crossed that I wont).

tracpac

Hey Dave ,what kind of heads are on the motors? Ported,stock,etc.
Jim

oldsmobiledave

Edelbrock heads on both engines. Wayne preps & ports all his own heads.

Mr Nick

Great post and nice combinations, thanks for sharing. I'd love to build a stroker SBO someday.

jims2000lt

Very cool. I'd like to see pics of your engines and Oldsmobiles.

VikingBlue

I added a gallon to the near empty can about two months ago, but one more chore led to another and I just don't know anymore if I added and mixed oil or not. So the consensus is, add the 50:1 because there's more risk in having no oil than too much ? Leaf blower is almost new, bought early fall.

VORTECPRO

122.5 MPH @ 3800 = 538 observed crankshaft HP
119.4 MPH @ 3800 = 498 observed crankshaft HP

I'm quite sure you race @ high altitude, how high is it? 2990? What RPM do you turn in the lights, and what does your converter flash? 60 foot times on both cars? Also I find it interesting the 470 with its higher RPM HP peak run closer to dyno HP as compared to the 524. Wayne Joss sounds like a great builder/shop!