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How much power did the stock '73-'75 318's have? My buddy has a 318 4bbl dual plane intake on his now. It was a 2bbl. Would there be a boost in power with this swap? If so...how much compared to the stock numbers?
 

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If I remember right a stock 18 has about 176 hp at the crankshaft (or maybe 168 :-\) Yes the 4bl will help, how much depends on what you do, however you can't just slap on great big 4bl without doing other stuff, stock 18's don't breathe very well
 

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4bbl 318's had different heads with bigger intake valves, too.
 

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If you check the "Engine" section there is a link about how much power stock engines have. The compression ratio data seems off on a lot of them though so who knows. Also no 4 barrel listing for 318 in 73 or 75. I didnt check 74. But in 73 the HP ratings were as high as 170.
 
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