20 replies to this topic

[whistler]

One thing to think about is what engine you have. If you have a small bore then that block is shorter than the 1275 one so will sit a bit lower.

[Cooperman]

Yes, those with a 3-pipe Y-piece are designed for racing where the volume of exhaust gas is higher because of the high revs. It was never intended for road use.

[Cooperman]

The exhaust on a 1071 S sits 1/4" lower than on a 1275 using the same manifolds.

[danc]

Thanks all for the comments.

This is a 1275 block, rod change sat in a single bolt subframe - nothing out of the ordinary going on.

The last two medium bore Maniflow LCBs i fitted were awkwardly close to the floor, but fine and nicely snug once in position. This particular one (definitely a large bore Maniflow) looks very poor in comparison.

[nicklouse]

Are you sure it is a Maniflow one?

[danc]

I was dead sure until very recently! :) I've never used anything other than Maniflow and didn't know anyone else did bigger LCBs.

If anyone has the time to check some outer diameter numbers, I'd be grateful...

My outer primaries are 1.5"
The centre one is 1.625"
Both diameters entering the Y piece are 1.625".
The Y piece collector is 2"