from my Bosch book of auto engineering and I quote :

The fine splines are stronger for a number of reasons: fine splines allow for a larger root diameter, the same reason that fine thread bolts are stronger
than the same size coarse thread bolt when placed in tension and cutting a fine pitch leaves more of the axle (or bolt) undisturbed

Hi Smitty, Morse here,
Thanks for the Backup, I might try and buy that book and research it.
Because I am not an Automotive Engineer just a Civil Engineer and a Boilermaker with a huge iterest in cars.

Some axles the Splines are rolled on. The axle is heated Red then then the spline is rolled on. This will cause the metal to move upwards. Then the axle is cooled down in a controlled area. It looks to me like HQ to HZ standard axles were done this way. Makes sense because the production times would of probably been quicker and also cheaper costs than Machining.

My Brother was a Fitter & Turner at Russell's in Huntingdale Vic., where Heat Treating was done on seatbelt bolts etc.for Ford in the 90's. Before everybody lost there Jobs.

Yes if a Bad Wheel Bearing is allowed to Heat up enough it can and will soften the axle metal next to it or under it.

Like bolts,rolled or cut thread. You can’t re-cut a rolled thread because the bolt is thinner than the thread, a rolled spline will be the same and therefore they are probably weaker, but cheaper to make.

a high tensile bolt, to make that grading or rating MUST have rolled threads.
I guess the same applies with car axles (which have to sustain huge torque inputs)

237 for the standard 292 for the performance?

237 and 264ci V8?

A test mule for the Holden V8 would need to be built prior 1969 a release? A HK?

Edited by user Wednesday, 6 May 2020 2:49:19 PM(UTC)  | Reason: Not specified

A Falcon and a Valiant!

Holden thought about chopping off 2 cylinder's of our Holden V8 for the VN Commodore 3.1L and 3.8L but went with the Buick 3.8L V6

Just think if Holden made a Buick 3.3L that would make say 108kw with EFI I would think. but why not just dig the old 3.3L six up then.
Holden go on about the old Holden six not worthy of cutting it in the unleaded world, what BS ! just look what they did with the Buick heads they is iron.
So a 3.3L would of been fine, just maybe do what Ford did with their X flow alloy head and do the same intake and exhaust change with no exhaust valves side by side and with EFI Look at the power that could of made and a compression of say 9.4:1 on 91 octane. then you would have more power than a Nissan 3.0L 6 cyl. with more torque down low and mid range. such a 3.3L 6 would be much smoother than the V6 chaff cuter rubbish that they had. what power would something like that have 115kw 120kw ? and fully balance the engine, it would have roller lifters as well with ADR and a Turbo option 150KW easy.

I have the Project VN Book and they go on about the Buick V6 as if it's so great, I think it's a blight ! especially the first V6, the next V6 is a bit better and the VS V6 is fine.
They talk about the 3.8L V6 being a good size 6 cyl for that size car I would agree, not to mention they are trying to verse the EA Falcon as Aussies wanted a big car then.
The EA Falcon 3.2L 6 did not survive sales must of been low ? it only had the cheap crap Fuel injection system on it tho. so the 3.2L did not make it to the EB Falcon. I think because of the EA having the 3sp auto and stupid high ratio diff. I drove a 3.9L Fairmont Giha 3sp auto once and boy was that gutless off the mark, it would not eve spin the wheels taking off on grass, where a V6 VN auto would spin on bitumen taking off.
So lucky that the Falcon was stuck with the 3sp auto as it could not get the 4sp auto at the start of the EA Falcon, or the VN V6 Holden may of been a disaster in sales.

How many CFM is a Stromberg WW2 on the 253 V8's and is the 186 S the same CFM not to mention the GTR 161.

Also what about the later HQ 253 got another 2bbl carby for a wile why was that and was the CFM more giving the 253 more power.

Also did the Falcons XR-ZA 289 V8 and XT-ZB 302, XW-ZC 302, XY-ZD 302 and the 302 Cleveland in the XA-ZF 302, XB-ZF 302 and not to mention so did the 302 V8 F100's as well. not to mention the XY-A 250 2v.

Our Valiant's did not get the Stromberg ww2 that I know of as from the VF Slant 6 with the big 2 barrel on to the Hemi 6 got the same 2V carby as the Standard Falcon 2V 351 V8 in the XY-ZD, XA-ZF, XB-ZG I think that they were all 351CFM as well, so maybe them HQ 253 were 351CFM and the ww2 Stromberg were 280CFM.

As far as I know the WW2 Stromberg can come in a range from 260 to 300CFM but the Carter 2V can go down to 280CFM I think.

Oh and the ZD Fairlane 351 V8 with the 4 BBL carby it's only about 480CFM and remember when you go into 4bbl the CFM change as to a 1V or 2V in how they are rated, so the 4bbl 480CFM becomes much less than a 480CFM 2V. so all this talk of a ZC 351W 4V with 4speed manual option being a rocket is not as such a big deal as people make out.