Goodson Tech Bulletin Board

Joe recently I head in an interview with Don Terrill you spoke of an epoxy that will stand the heat in an exhaust port. Is this something you sell? If so what quantity can it be obtained?
Thanks.

Joe Does backcutting an intake valve help or hurt wet flow in a street engine? What about in a race engine? Thanks!!

Joe Do you think there is a performance advantage to leave the entire intake port on an aluminum head as a rough texture? (Like texture left with an course aluminum burr) And what about immediatly below the valve job in the bowl area?

Rebuilding low milage engine with chrome liners (broken crank). Can you suggest mainstream way to prep cylinders for new non-chrome rings. Liners in good shape no scratches. Diamond rough up hone?

Bill

Joe
Would a 454 BBC bracket engine running at max 6500 RPM benifit from a 50 degree seat vs a 45 degree?

Thanks Erik

At initial startup on a rebuilt engine what is the best way to measure oil pressure?

Hi Joe
I have tried putting a radius on the OD of the exhaust valve head (combustion chamber side of valve) to help the exhaust gases get around the valve head more easily. But so far I always loose flow on the flow bench with this modification. My testing has been with 70’s era OEM GM cast iron heads.

What are your thoughts and experiences with this?
Thanks!

Hi

I want to know If I can use infinite flow cutter blades on Neway standard series cutter body?

Thanks!

I have an old Thor valve seat grinder. Could you tell me what other brands of stones stone holders. and pilots weiil fit.

Joe when refinishing seats (3 or 5 angle) on a motorcycle head used for road racing what produces a better finish seat cutters or stones? Could you recomend a practical beginner set up?