1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

E.T. too slow for the current upgrades?

Old 04-04-04 | 04:21 PM
  #26  
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It's probably running lean from lack of fuel. A street ported engine should feel a nice kick in the pants at about 5200-5500 and pull all the way up to as high as you dare to rev it.

Wait... *what* DCOE carb do you have? Know what size? One or two carbs?

Commonly installed is a 45DCOE, which is about right for a stock 12A. You'll be wanting something more biggerful for a raunchy 13B.
Old 04-04-04 | 04:31 PM
  #27  
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Originally posted by peejay
It's probably running lean from lack of fuel. A street ported engine should feel a nice kick in the pants at about 5200-5500 and pull all the way up to as high as you dare to rev it.

Wait... *what* DCOE carb do you have? Know what size? One or two carbs?

Commonly installed is a 45DCOE, which is about right for a stock 12A. You'll be wanting something more biggerful for a raunchy 13B.
Yea, it's a 45DCOE. What carb would you suggest? I can't get it now but I'll start saving up for one.
Old 04-04-04 | 04:44 PM
  #28  
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First take the carb off and measure the diameter of the holes in the intake manifold at the carb flange, and a little ways in.

There's no point in putting a larger carb on if the ports in the manifold are a lot smaller than the throttle bores. You can go with maybe 3-4mm larger on the throttle bores since the throttle blades/shaft take up some of the area in the carb.

If the diameters at the flange and a ways in are about the same, then that'd be your starting point. If the diameter a ways in is smaller, use that. If the flange is smaller, it can be ported out if necessary.

The largest DCOE is a 48mm, if you can find one. There are larger yet sidedrafts (50DCO, 55DCO, 58DCO?) but they don't have choke mechanisms, which is something to keep in mind. A 48 or 50 would be a nice place to start. We're talking bucks, though, so eBay would be your best friend.
Old 04-04-04 | 04:52 PM
  #29  
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Yea, a 50DCO is looking at 500$ and a 55 is looking at 550$. At that point I could probably just save my $ and get a holley kit(800$).
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