Gettin a-head

[petemonster]

Hey kids,
I' new here. I have a question about a 250 inline six.
A friend of mine wants to hop up the 250 in his truck.Does anyone know of a good site on building these engines?
I heard something about using Olds rods and pistons.
Most importantly however,I would like to know about the cylinder head.
My question on that is,what is the wall thickness in the ports?The head uses chevy 1 3/4 small intake valves ,and I was wondering if there is enough meat there to straightbore the valve pockets to accept 1 15/16 large valves...........I do this all the time on small valve 624 and 882 V8 castings and use 3/8 stem 1 1/2 exhaust valves.
Or would it be better to do maybe say a 70 degree taperbore and install new valve seats?

[Captkaos]

I can only recommend getting the book on the Chevy inlines. It has some info you may be looking for.
As for performance, talk to these guys:
http://www.sissellsautomotive.com/

[C&C Chevy]

Honestly? I'd get a $1300 350 crate engine and be done with it..

[68Stepbed]

www.cliffordperformance.net has alot of performance 6-cylinder parts and modification info.

PM Sent.

[petemonster]

Originally Posted by C&C Chevy

Honestly? I'd get a $1300 350 crate engine and be done with it..

Well ,we work at an engine shop, so most of it will be free..maybe $100 for parts, so that's prolly why he wants to screw around with it.I personally don't care to me it's another valve job ,and we kinda work on the you do I do system,so if I ever need anything done........I've just never done that to a six b4.
Thanx for the info tho guys hopefully I can find somethin around... otherwise I'm just gonna chop and watch the look on his face when I hit the water jacket lol.