I am slowly getting a set of standard twin 1.25's ready for fitment but have a couple of questions.

1. using a straight edge across the manifold faces there is a slight discrepancy at one end of aprox 0.5 mm. Is that ok? Will it be taken up by the gasket?

2. The carbie side has been opened out, is that standard or a modification. If modded does it matter that the spacers and heat sheild now create a lip as they don't match that wider opening.

see pics

Cheers

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68 Morris Cooper S Mk1 (*ex 78 1275 LS 4th last built, 70 Morris 1500 OHC & 70 MiniMatic)

Phil

Don't know much about the effect of the lip on the cabie side, but I would grab a couple of sheets of wet n dry (one for each port) and dress them up on a flat surface.

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Dalmeny

That is enough to blow an engine up from running lean. (Sucking Air) Throw it away and get a new one or you will suffer the consequences of a much dearer blown up engine.

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DID I MENTION THAT I AM THE BEST SUPPLIER FOR MINI ELECTRICAL PARTS AND REPAIRS?
"Let us remove your "SHORTS"

That is the standard for all factory twin1.25 in manifolds ........

Edit : Even the Mk2 and GT twin manifold with the square mounting pad has the same tapered holes

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1965 Morris 850
1966 Morris Mini Minor
1967 Morris Cooper 'S'
1977 Leyland LS

I would spent 10mins to set up on the mill and clean them up flat and level.

As for the manifold being 1.5" on the carb side, that was so they could homologate H4 carbs and the standard manifold for competition. Back in the 60s.
That step will not affect flow. (it would if it was the other way around).

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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.

Thanks guys, I realise a air leak here is a big deal which is why I asked. It actually looks worse in the photo than it is I think.

Cheers

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68 Morris Cooper S Mk1 (*ex 78 1275 LS 4th last built, 70 Morris 1500 OHC & 70 MiniMatic)

They get that way due to overtightening of the manifold nuts.

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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 can see it's just really in that one area where the nut would sit.

Cheers

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68 Morris Cooper S Mk1 (*ex 78 1275 LS 4th last built, 70 Morris 1500 OHC & 70 MiniMatic)

After a visit to the Doc for some gentle milling all is well.

Thanks again Dr Mini.

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68 Morris Cooper S Mk1 (*ex 78 1275 LS 4th last built, 70 Morris 1500 OHC & 70 MiniMatic)

Check your exhaust as well.

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That's why it's good to be.............ME