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dirtbkr188 · 11-04-2009, 01:50 PM

I took some measurements of an XR70 head and also an E22 head from an Xtreme SuperStock88 engine. The Xtreme engine was a 47mm bore and 49.5 stroke using a 69mm tall cylinder. Here are the results:

XR70

Bevel OD - 47.40mm
Bevel ID - 41.45mm
Depth - 14.40mm
Intake valve - 23mm
Exhaust valve - 20mm

E22

Bevel OD - 46.86mm
Bevel Id - 40.36mm
Depth - 13.40mm
Intake valve - 23mm
Exhaust valve - 20mm

I'm expecting a TB race head within the next day or two, I can measure that one also, if you'd like.

11-04-2009, 01:50 PM	#19 (permalink)
dirtbkr188 3rd Gear Member Join Date: May 2004 Location: New Jersey Posts: 3,192	Re: Intake Port Question for z50 I took some measurements of an XR70 head and also an E22 head from an Xtreme SuperStock88 engine. The Xtreme engine was a 47mm bore and 49.5 stroke using a 69mm tall cylinder. Here are the results: XR70 Bevel OD - 47.40mm Bevel ID - 41.45mm Depth - 14.40mm Intake valve - 23mm Exhaust valve - 20mm E22 Bevel OD - 46.86mm Bevel Id - 40.36mm Depth - 13.40mm Intake valve - 23mm Exhaust valve - 20mm I'm expecting a TB race head within the next day or two, I can measure that one also, if you'd like.