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Old 10-17-2008   #1 (permalink)
blak5lame is offline Apprentice

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Default performance question

for starters whould a 4bbl carb do much for me as far as performance goes. whats the average horsepower gain?
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1978 cobra II black/primer 5.0 HO 302.
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Old 10-17-2008   #2 (permalink)
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ya it would, but i'm sure you can find a holley hi performance 2 brrl, that way you can change jets. Just an option, with the 4 barrel, its an intake, i'd upgrade the headers at the same time too.




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Old 10-21-2008   #3 (permalink)
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Mustang Monthly magazine recently did an article in which they took a stock 289 2v and added headers and dual exhaust to pick up the horsepower from 141 to 153 at the rear wheels, a gain of 12 horsepower.

The next month, they swapped the stock 2-bbl carburetor and stock 2-bbl. intake for a stock 4-bbl. Autolite carburetor and cast-iron 4-bbl. intake. The results were 18 more horsepower at the rear wheels (carburetor, intake, headers, and exhaust had combined for a total of 30 more horsepower at the rear wheels).

They then swapped out the stock, restrictive air cleaner assembly (which isn't that different from the stock one on our 302s) for an open-element 14" air cleaner, pickin up another 15 horsepower at the rear wheels, taking the total to 186 rear-wheel horsepower.

What does this all mean to you and me?

Well, for starters, our 302s with their low compression and smog gear aren't as powerful as that stock 289; but they benefit from the same upgrades. Also, you and I aren't likely to be going with a stock 60's era 289 intake, we're more likely to use a street-performance intake from Edelbrock or Weiand that runs cooler and builds more power. While you might not see that same 186rwhp number they got out of their 289. You'll definitely see similar overall gains, if not a little more, from the carb, intake, headers, exhaust, and air cleaner improvements. You might even see a little improvement in your gas mileage if you drive it conservatively (but what would be the fun in that?)

If you were really feeling ambitious, you could throw a better pair of cylinder heads and a little lumpier camshaft in there and make some serious gains; but ideally, replacing the stock low-compression pistons and a full rebuild will get you the overall best results from one of these engines. How far you go is only limited by your abilities and/or pocketbook.
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Old 11-27-2008   #4 (permalink)
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Or you can pick up a later model 5.0 roller motor, carb it and it will run very nice.
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