To cut a long story short I have stuffed up and found out the my engine is intact a 1370 with 73mm pistons and my new ones are 73.5 mm. Question is are you able to bore from a 1370 to 1380? Or is it too minimal.

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If its yours, customize it !

If it is 73mm bore with stock stroke it is a 1360, not 1370.
Yep it's a straight +.020" overbore & hone job. The usual next size up.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Yeah I just read somewhere else it ment it was a 1360. This is good news because I thought it was at its last size. I've seen that it costs around $150 for a rebore of bare block. But what is involved with a 1380 offset bore and cost?

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If its yours, customize it !

It is only getting .010" taken out of each side of the bore. If you wanted it offset bored it's really too late, it should have happened sooner (eg when bored from 1310? to 1360) when you could take more metal out to allow the offset.
I think all you can do now is straight bore it.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Okay thanks. I'll have to do a bit of research how to retime my re13 cam now that I have to pull it out.

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If its yours, customize it !

Correct me if I'm wrong, but I seem to recall 1370 was achievable using Triumph (Herald? 2.5?) pistons and during the 1970s was quite common for racing and autocross engines. I think Vizard may refer to it.in one of his books.

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Slide
1965 Mini Van (1360)
1970 Mk2 Cooper S (1310)
1978 Rover SD1 V8 (4.6)
1996 Land Rover Discovery V8 (4.0)

That wasn't 1370. According to Vizard, Triumph 2.5PI pistons with std stroke gave 1426cc.
They were 74.7mm bore.

[edit] I think Nissan pistons gave you a 1370 but it wasn't in Vizard's books.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

yeah 10thou over datsun 1200 gives 1370-ish

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

page 310 of big yellow Vizard

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did I tell you that I won a trophy?

Okay so I'm going to have to remove my crank and cam to bore the block. Now I have rebuilt engines before but when it came to timing I have only lined up the dots. Where would I get info on timing in my re13.

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If its yours, customize it !

RE13 cam has an LCA of 106° approx.
I would dial it in at full inlet lift 106° ATDC if you have a belt drive cam, or 104°ATDC if you have a chain (allows a bit for chain stretch/wear).
Best to check this with head on and rockers adjusted (to apply working load to the chain).
If you have non-adjustable sprockets, I'd use an offset cam key.
However, many folks just throw this cam in and align the dots, they still (usually) work OK.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Okay. Yeah ill have a go and doing it properly. I want to get as much fun out of this car as possible haha.

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If its yours, customize it !

Okay so would this way work well? i ask because having a physical video of what i have to do seems to work better for me.

http://www.youtube.com/watch?v=Uhv5_-JOfmM

And would this be the timing disk i want?

http://www.ebay.com.au/itm/Mini-Kent-Cam-Camshaft-Timing-Disc-Wheel-Austin-Morris-BMC-Rover-Piper-/140983869555?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item20d34b2073&_uhb=1

Cheers, Tom

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If its yours, customize it !

The block back from machine shop. So now I ACTUALLY have a 1380. Just waiting on parts now. Always waiting on parts.

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If its yours, customize it !