Ollies 75 rebuild

C3 Specific - Technical and Performance

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Ollie68
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Postby Ollie68 » Mon Sep 29, 2014 9:38 pm

I finally pulled my digit out and got on with putting the posi together in preparation for the final assembly of the diff in a few weeks when I go and visit the folks.
My father has done a few truck diffs in his time so between the two of us we should get it right. My brother has a diesel workshop in the same town so we will do it there so there will be plenty of advice coming from all over the place :-o
Anyway the posi is ready thanks to Toms you tube video that Bruce (Fissan) suggested and the guys at The Gear Shop in California ( Toms was out of stock ). I ended up with a Toms boxed gear set in 3:73 ratio made by US gears and new solid clutches. They even threw in a couple of T shirts. Total was just over $600 landed in aus. A local mob wanted $800 just for the clutches from his supplier :shock:

Okay its photo time :)

Everything laid out

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The clutches in place before the shims had been selected
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The final assembly all shimmed and ready to go. I ended up with 47 thou shims to get it just right.

Image

And then there is the home made tool for turning the posi to settle everything. 50 times both ways then re shim until its nice and firm :o

Image

:D

Ollie

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Ollie68
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Postby Ollie68 » Thu Nov 27, 2014 10:05 am

Hi all,

I really haven't done a great deal lately that's news worthy however I have been slowly putting my L82 sbc together. I was given a set of roller rockers from my brother that are the exact same ratio ( 1.5 ) as the originals but of course the rocker covers don't fit that I spent hours polishing :evil:.
Then I thought I would be smart and use a short water pump but surprise, surprise they are different to a corvette water pump :evil: :evil:.
So new water pump ordered and a new Holley street avenger 670 with vac sec ordered at the same time :-)

Image

:D
Ollie

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68ragtop
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Postby 68ragtop » Thu Nov 27, 2014 2:43 pm

Looking real nice there though!

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riverracer
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Postby riverracer » Thu Nov 27, 2014 3:10 pm

you can buy shorter "posi locks"
or
buy alli rocker cover spacers,
or
run multiple gaskets....
Speed has never killed anyone,
Suddenly becoming stationary that's what gets you.

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Ollie68
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Postby Ollie68 » Fri Nov 28, 2014 7:13 am

I ended up ordering a set of nostalgia type finned tall rocker covers which are tall enough to fit the roller rockers. I did think of spacers but it just leaves more chances of leaks. I'm not going for the totally original look so the finned will be fine for now I reckon :o
Image

:D
Ollie

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68ragtop
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Postby 68ragtop » Fri Nov 28, 2014 10:07 am

I approve of your choice (having dropped the same ones onto mine recently). Only problem I had with a single gasket on is I'm needing to do a bit of grinding to get some clearance from the intake runners in places.

Image

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Trudgeo
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Postby Trudgeo » Fri Nov 28, 2014 3:47 pm

Hey Ollie,
are you using Roller Lifters and a Roller cam too???? We're doing a customers' BB454 (now a460) and have all the good gear in it.......roller Hydraulic lifters, cam and triple springs on roller rockers (all Howards). The motor builder say's you SHOULD use a roller cam for roller rockers as this extends life of lifters and make sure the rod lengths are right so that the rockers are at Maximum effective rocking placement.....less chance of trying to pushvalvein a sideway motion and MAXIMUM effective rocking action! :shock: :o :)
Give us a call if you want a better explanation, I'm NOT too technical with all this.....it's not my thing! fw) fw) :-x :-x :o

Bazzas77
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Postby Bazzas77 » Sat Nov 29, 2014 8:31 am

Hey ollie, is that diff still a standard size 10 bolt or do those bits make it a "super 10 bolt".?

anyway its looking good and so does that motor :o :o :o

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Ollie68
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Postby Ollie68 » Sun Nov 30, 2014 8:06 pm

Hey ollie, is that diff still a standard size 10 bolt or do those bits make it a "super 10 bolt".?

Yeah Bazz its a super 10 bolt, its had the Toms rebuild technique :-o

are you using Roller Lifters and a Roller cam too????


Nah its just a hydraulic flat tappet cam from summit :o
Nothing to special just a bit of a lump on idol and low torque from 1500 to 5500.
Picked up a Holley 670cfm street avenger yesterday with vac sec so I'm getting keen to fire this baby up :-) 8) :o
Just need to sort out the dizzy ::

:D

Ollie

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riverracer
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Postby riverracer » Sun Nov 30, 2014 8:59 pm

are you going original points style, electronic, hei or msd box? so many choices. ::
there was a "mallory uni-lite" in the engine when i got the vette,
but have now gone back to the std points dissy with the new engine.
have got a "breakerless ignition" kit to put in, just haven't got around to it yet.
Speed has never killed anyone,

Suddenly becoming stationary that's what gets you.

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Postby Bazzas77 » Sun Nov 30, 2014 9:04 pm

Ollie68 wrote:
Yeah Bazz its a super 10 bolt, its had the Toms rebuild technique :-o

Ollie


good stuff , a mate here got one all done from Traccdog in the states,i got mine a few weeks later from Gary Ramadei, mine is the 12 bolt though, looks like we all have the same ratio,s now :-x

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Ollie68
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Postby Ollie68 » Sun Nov 30, 2014 9:07 pm

I would like to go MSD billet with the 6a box, but the funds are drying up so the HEI with MSD module, cap and rotor will have to do for now. I have an original GM HEI type ready for upgrading. :-)
I kinda like the simplicity of the HEI style :o
:D
Ollie

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Ollie68
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Postby Ollie68 » Sun Nov 30, 2014 9:10 pm

Bazzas77 wrote:
Ollie68 wrote:
Yeah Bazz its a super 10 bolt, its had the Toms rebuild technique :-o

Ollie


good stuff , a mate here got one all done from Traccdog in the states,i got mine a few weeks later from Gary Ramadei, mine is the 12 bolt though, looks like we all have the same ratio,s now :-x


I'm going to my brothers week after next to put the complete diff together with his help as he's done a few in his time :o

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Ollie68
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Postby Ollie68 » Sat Dec 06, 2014 10:43 am

Almost finished the assembly of the 350. Inlet manifold and tall rocker covers fitted.
New water pump for corvette, as they are different to a standard short water pump :evil: ?
Just need the dizzy, plugs, water and oil senders, water outlet and thermostat to complete.
I'll pick up a torque converter this week as well as finish the diff assembly.
Hopefully I can have it all in the frame by the end of December???

Image

:D
Ollie

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68ragtop
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Postby 68ragtop » Sat Dec 06, 2014 3:27 pm

Which gaskets did you use for the rocker covers? I ended up getting a pair of really thick cork ones that had some good "squish" to them. This was because my covers turned out to have about a 0.010" gap right in the middle when i put a straightedge on them.

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Ollie68
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Postby Ollie68 » Sat Dec 06, 2014 4:05 pm

68ragtop wrote:Which gaskets did you use for the rocker covers? I ended up getting a pair of really thick cork ones that had some good "squish" to them. This was because my covers turned out to have about a 0.010" gap right in the middle when i put a straightedge on them.


I just used the felpro cork gaskets for now. The covers are only lightly attached as I still have to prime the oil system and I want to see that I get valve train lubrication before I seal them down. I will have a good look at the straightness of the covers to be sure :o .

:D
Ollie

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CraigH
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Postby CraigH » Sat Dec 06, 2014 9:08 pm

I used felpro cork as well and have worked ok but get oil soak after a while and seep some oil.

Have some other felpro ones including blue silicone ones to try at some stage

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Ollie68
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Postby Ollie68 » Sun Dec 21, 2014 8:08 am

I have reached a milestone, my chassis is now rolling. My father and I reassembled the diff the other day. Its now installed, along with the drive shafts and composite rear spring. I fitted a spare set of wheels and tyres and ta da its a rolling chassis.
All going well I will have the motor in before the new year?

Anyway here's a few progress photos:

Pinion set up

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Differential with new crown wheel fitted

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Setting the pattern for the drive side

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Setting the pattern for the coast side

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All done and ready for the rear cover

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Ready for paint

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All painted and ready for installation

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All fitted with drive shafts connected an VB&P composite spring fitted
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The rolling chassis :)
Image


I have fitted a sump plug to the bottom of the main casting just where the pinion shaft finishes to make draining oil a lot easier.
We ended up with around 0.007 thou BL and what we believe is a good pattern on the drive or load side of the crown wheel.
I incorrectly mentioned in an earlier post of the gear set being 3.77, they are in fact 3:55:1, Toms differential gear set with a Yukon rebuild kit :-)

So I now have a roller and I have moved it into the garage for the engine installation.
:D
Ollie

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Postby Bazzas77 » Sun Dec 21, 2014 1:44 pm

well done Ollie, its a great feeling getting it to that stage, take plenty of pics of it :o

don't forget to put some oil in that new diff :-x

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Ollie68
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Postby Ollie68 » Sun Dec 21, 2014 3:30 pm

Bazzas77 wrote:well done Ollie, its a great feeling getting it to that stage, take plenty of pics of it :o

don't forget to put some oil in that new diff :-x


Yep I'm rapped to get it rolling again.
Oil, check. Posi additive is on the shopping list. :o

:D
Ollie

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Trudgeo
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Postby Trudgeo » Sun Dec 21, 2014 5:23 pm

:shock: :shock: :shock: :shock: :o :)

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Postby australi » Mon Dec 22, 2014 12:25 pm

Looking great Ollie! :o :-)

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DOC
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Postby DOC » Mon Dec 22, 2014 7:01 pm

A) Looking great! :o

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Ollie68
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Postby Ollie68 » Mon Dec 22, 2014 8:53 pm

Thanks fella's, its really great to finally have a rolling chassis. :)
:D
Ollie

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Ollie68
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Postby Ollie68 » Tue Dec 23, 2014 9:33 pm

Well I have reached a goal I set for myself and that was to have the engine in a rolling chassis by the end of the year and I've done it. Over the next month or so I will get it ready to start the engine and run in the cam. I still need to buy a radiator and prep the fuel tank before that happens.

Image

Image

:D

Ollie

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DOC
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Postby DOC » Wed Dec 24, 2014 4:34 pm

Cool! Looking really good Mate!

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Smithy007
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Postby Smithy007 » Thu Dec 25, 2014 9:54 pm

Nicely done mate. You doing any work at the moment :-o :-o

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Ollie68
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Postby Ollie68 » Fri Dec 26, 2014 9:19 pm

Smithy007 wrote:Nicely done mate. You doing any work at the moment :-o :-o


Yeah, its all done between shift rotations :) :) :)
I try and squeeze in some family stuff too :o

:D
Ollie

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nutty
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Postby nutty » Wed Jan 07, 2015 7:11 pm

Family stuff , Where dose the time go Ollie, I would love two weeks off to do solid work on the car but then they want to go away or go to the movies fw) but I have realised it will happen in time

And by the way you have gone in to more detail then me but yours is looking great :D :)
If it Don't Go, Chrome It ,

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Ollie68
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Postby Ollie68 » Thu Feb 26, 2015 10:11 pm

Hi all,

Not much doing lately as our house is on the market and the project has taken a bit of a back seat, however a mate has kindly loaned me his car whilst he's away on holidays so my old girl wont be so lonely :-x :-x
Its kinda cool getting around in a convertible for something a little different :-)
Image

:D
Ollie


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