372 porting

[Craigb]

Ported my 372xp. Original numbers were 100 exhaust opens transfers at 120 and intake at 72. I increased the inlet duration to 154 with a curved bottom to lessen intake roar and raised the exhaust to 98 and flattened the top. Both ports got widened to 70% of the bore and the lower transfers got matched to the case. I can confirm she is a runner and despite the massive increase in the intake doesn’t fall on its arse.

Edited November 14, 2023 by Craigb

[spudulike]

Those older 372XPs port up really well, big gains to be had with what you have done and a suitable muffler mod.

[Craigb]

9 minutes ago, spudulike said:

Those older 372XPs port up really well, big gains to be had with what you have done and a suitable muffler mod.

Like this?

[Stubby]

11 minutes ago, Craigb said:

Like this?

And like this

[spudulike]

I was always subtle and sympathetic to the original design in my muffler modding....unless doing work for forestry where setting off car alarms, seismic detectors and early nuclear early alert stations isn't an issue. Unfortunately, in other work, there is usually a winging neighbour/customer that like to complain about things like blood streaming from their ears.

[Craigb]

1 hour ago, spudulike said:

I was always subtle and sympathetic to the original design in my muffler modding....unless doing work for forestry where setting off car alarms, seismic detectors and early nuclear early alert stations isn't an issue. Unfortunately, in other work, there is usually a winging neighbour/customer that like to complain about things like blood streaming from their ears.

They can always shut their windows. 😉

[Blackbriarwoods]

15 hours ago, Craigb said:

They can always shut their windows. 😉

Not if you can blow the glass out 😎