10-25-2006, 05:21 PM | #1 |
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Join Date: Oct 2006
Location: minnesota
Posts: 5
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Gettin a-head
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? |
10-25-2006, 06:23 PM | #2 |
www.73-87chevytrucks.com
Join Date: Dec 1999
Location: Birmingham, AL
Posts: 6,935
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Re: Gettin a-head
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/
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Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com |
10-25-2006, 07:14 PM | #3 |
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Join Date: Feb 2003
Location: Midwest City, OK
Posts: 1,001
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Re: Gettin a-head
Honestly? I'd get a $1300 350 crate engine and be done with it..
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Robert Current: 1986 SWB Silverado 4.3 / TH400 Past: 1985 SWB Silverado 305 / TH350 - sold 1995 1987 1/2 ton Silverado - FI 350 / 700R4 sold 2007 |
10-25-2006, 08:36 PM | #4 |
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Join Date: Mar 2005
Location: 10-Uh-See
Posts: 5,609
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Re: Gettin a-head
www.cliffordperformance.net has alot of performance 6-cylinder parts and modification info.
PM Sent.
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10-26-2006, 05:32 PM | #5 | |
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Join Date: Oct 2006
Location: minnesota
Posts: 5
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Re: Gettin a-head
Quote:
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. |
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