08-03-2020, 01:47 AM | #1 |
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Location: Qld, Australia
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C69A block
I have made a blue on my spare engine, Didn't,t check the wall thickness before I bored it (3-3125),Turns out one cylinder has a part of the wall at .070 thick, this made a squeak at idle that I think was the bore letting the comp past,
So, I sort through my spare blocks and find one that looks good, Its a C69A and has the oblong water passages above the valves like an 8ba, instead of the usual small round ones, is this a Canadian only thing? Also what do you use to mount the engine stay rods to if you use an 8ba block in an early car. Thanks Lawrie |
08-03-2020, 02:25 AM | #2 |
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Re: C69A block
Lawrie, The C69A is the block to use for big bores; has real thick cyl walls. Yes, Canadian only engine. Originally, had shell rod bearings [double hole crankshaft], valve rotators, hard valve seats on ex only.
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08-03-2020, 03:08 AM | #3 |
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Re: C69A block
Brian ,you are a mine of info.
And yes they are thick, most on this one around.247 thick. I also have looked at sleaving the one with the .070 wall and that looks like a doable job for me. Lawrie |
08-05-2020, 05:54 PM | #4 |
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Re: C69A block
No Pan Rail plugs either which I like, One less place to leak, 8BA style top deck centre holes.
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08-07-2020, 01:20 AM | #5 |
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Re: C69A block
Had one in my previous 47 cpe. they are good blocks.
GB
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08-07-2020, 03:06 AM | #6 |
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Re: C69A block
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They are good blocks if you want to bore big, on account of their thick cyl walls. However, I feel the iron they are cast from is not of the same high quality as pre war blocks. I make this statement because the C69A iron certainly doesn't weld the same as the early blocks. I've welded a few blocks over the years.....
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08-07-2020, 08:42 AM | #7 |
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Re: C69A block
Lawrie, Re engine stay rods to 8ba. I have done this a few times over the last 50 or so years to 35s 36s & just done a 32.
The bottom two bolts holding the 8ba bellhousing to the block are inline with the stay rods. on the 32 I have just done I stood the block, back end up on my Bridgeport & drilled the holes out to 7/17" & made a tool to spot face the front side of the holes. I made a new pair of stay rods the correct length that just look like the originals On the 35s & 36s I just machined a a piece to fit the block & welded it to the back part of the original rods. The 8ba block & bellhousing are thicker than the stay rod lug on the early blocks & the length from the back of the bellhousing to the chassis mounting is different. Phil. |
08-07-2020, 11:17 AM | #8 | |
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Re: C69A block
Quote:
Cheers Tony |
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08-07-2020, 03:13 PM | #9 | |
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Re: C69A block
Quote:
GB
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08-10-2020, 07:44 PM | #10 |
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Re: C69A block
Geez all the kiwis are in this thread! Go the C69A
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