Late 60's 250 Straight Six Performance Parts? - Chevrolet Forum - Chevy Enthusiasts Forums

Late 60's 250 Straight Six Performance Parts?

snowman4839's Avatar
CF Beginner

Join Date: Feb 2010
Posts: 1

February 24th, 2010, 2:53 PM   #1  
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; February 24th, 2010 at 2:56 PM.
desrtrat's Avatar
CF Active Member

Join Date: May 2009
Posts: 119
Daggett CA

February 24th, 2010, 3:06 PM   #2  
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..

Bowties's Avatar
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Join Date: Jan 2013
Posts: 6

January 17th, 2013, 10:45 AM   #3  
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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