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Old 02-24-2010, 02:53 PM
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Join Date: Feb 2010
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Default Late 60's 250 Straight Six Performance Parts?

Hey guys, I just got my first car a little over a week ago. It's a 1969 Buick Special Deluxe with a Chevy 250ci straight six and 3 speed. I'm coming here because the guys at the buick forums weren't of much help on a chevy engine. I really want to hop it up and the first things I thought were exhaust and intake. This version of the straight six has separate manifolds because I know the later ones had a combined single manifold. I have an idea on what to do. I want to get headers and run dual exhaust out the back and I was hoping to get either dual 2-barrels or a single quad along with the new intake manifold. How would both of these affect my mpgs/hp gain? And how would I know what carbs would fit what? Do all GM's of the same type (single, 2 barrel, 4 barrel) and time fit each other or what? The last thing is how do I know if I'll drown the engine or not? Its just got a single 1-barrel Rochester on it right now I believe

I was looking at getting...
Intake -
2 Carbs -
2 Adapters for 1-barrel to 2-barrel -
Linkages -

Headers (what type of stuff would I need after the headers?) -

Would I need anything else and would this be worth it? Thanks

Last edited by snowman4839; 02-24-2010 at 02:56 PM.
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Old 02-24-2010, 03:06 PM
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Join Date: May 2009
Location: Daggett CA
Posts: 119

for the money, find a good used 350. to make most of those parts work well your going to need higher com. cam/head swap..

good luck tho..
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Old 01-17-2013, 10:45 AM
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Join Date: Jan 2013
Posts: 6

I have just picked up a '67 250 and I have seen these engines really pushing some serious power. Check out the website Clifford6=8 for the headers and intake you are looking for. Plus they have cams as well but it depends how far you want to go, Good luck
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