Got a 7mm what type of porting is this

[fbt551]

transfers have 120*duration

Exhaust is 180*durarion

I dont have pictures right now but intakes have boysen ports

[BANSHEE HP]

The wrong kind

[trickedcarbine]

Sounds like some one just tossed a 7mm crank in a set up for much less stroke. You may have a lemon on your hands.

[BANSHEE HP]

More stroke. If the port timing are that low with a 7mm crank they'd be higher on cylinder ported for a 4mm.

[BANSHEE HP]

180° is like 34.5mm exhaust on a 7mm

197° is 30mm on a 7mm

[BANSHEE HP]

30mm on a 4mm is 191°

34.5 on a 4mm is 172°

[sleeper06]

Sounds to me like someone decked those cylinders down to get those numbers better degree that again and check it

[fbt551]

Ill go back out there and check they were ported by an active sponsor

[fbt551]

My bad 190*/130*

[fbt551]

30mm on a 4mm is 191°

34.5 on a 4mm is 172°

Rechecked its 190/130 I believe its more of a dune port

[BANSHEE HP]

sounds like it.

[sleeper06]

That's why I said check it numbers didn't make sense to me , those cylinders have to little blow down for my liking but will have smooth power delivery enjoy, every ones definition of dune port is diffrent to me it's more aggressive trail hill shooter style porting

[fbt551]

Im looking for straight drag with some hill shooting I was running 203/134 on my 350 on light frame and im light also was thinking of going 205/138

[fbt551]

7mm longrod 39mm carbs out frame pipes hopefully shearers

[sleeper06]

200/130 is perfect for that motor don't go any higher