Chevette engine v Viva engine

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Chevette engine v Viva engine

Postby vauxhallbitz » Mon Oct 29, 2018 11:11 pm

This has probably been covered before so if it has I apologise.

Is there a difference between a 1256 Viva engine and a 1256 Chevette engine?

In particular with regards to the head and head bolts?

Any assistance would be appreciated.
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Re: Chevette engine v Viva engine

Postby HC Fairley » Tue Oct 30, 2018 7:03 pm

Exactly the same save for the engine mount which is the same bolt pattern as the viva mount just slightly longer. I dropped a rebuilt chevette engine into my viva, just swapped the mounts. Hope this helps!!
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Re: Chevette engine v Viva engine

Postby redfirenza » Wed Oct 31, 2018 10:15 am

externally they will be the same, internally the main & big end bearings changed, also the rocker posts and tappet adjusting nuts changed size depending on engine number, you might even get the bonus of a Bosch distributor!
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Re: Chevette engine v Viva engine

Postby 1972nail » Wed Oct 31, 2018 12:48 pm

redfirenza wrote:externally they will be the same, internally the main & big end bearings changed, also the rocker posts and tappet adjusting nuts changed size depending on engine number, you might even get the bonus of a Bosch distributor!


The bearing change was in '74 ish, long before the Chevette came along. The distributor was also fitted to late model Vivas.
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Re: Chevette engine v Viva engine

Postby vauxhallbitz » Wed Oct 31, 2018 6:00 pm

Thanks guys, I bought a reconditioned Chevette short block a few years ago but want to put my original head on it as it is converted for unleaded.

I take it I can use the original Viva head bolts?
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Re: Chevette engine v Viva engine

Postby HC Fairley » Fri Nov 02, 2018 12:16 pm

Yes I do believe the head bolts are identical :D
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Re: Chevette engine v Viva engine

Postby vauxhallbitz » Fri Nov 02, 2018 7:16 pm

Thank you
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Re: Chevette engine v Viva engine

Postby pbottomley » Fri Nov 02, 2018 8:25 pm

All 1256cc engines use 7/16th bolts, there are diff types of bolts but interchangeable...

shanked or non shanked.

captive washer or none

all in the anorak section if you didn't know :goodideasign:

viewtopic.php?f=289&t=16078
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Re: Chevette engine v Viva engine

Postby vauxhallbitz » Sat Nov 03, 2018 3:46 pm

Thanks for that.
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Re: Chevette engine v Viva engine

Postby ADRIAN » Tue Nov 06, 2018 8:05 pm

One point.....the Chevette ring gears are "reversed" - because the Chevette have Pre - engaged starter motors. Bevels to the teeth are facing to other way. You have to use the "Viva" flywheel and its ring gear with a inertia starter motor or the teeth gets chewed up.
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