SBC Cam ?
11-19-2002, 09:52 PM
#13
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Location: Lake St. Clair
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Re: Same as stock
Originally posted by Dennis Moore
SLP
The camshaft you are running is about the same as the stock marine cam. You should see a big increase if you go with the camshaft that I recomended. Should be fun!
Sincerely
Dennis Moore
FAMILY AND PERFORMANCE BOATING MAGAZINE
SLP
The camshaft you are running is about the same as the stock marine cam. You should see a big increase if you go with the camshaft that I recomended. Should be fun!
Sincerely
Dennis Moore
FAMILY AND PERFORMANCE BOATING MAGAZINE
So what are your thoughts on the aftermarket exhaust, such as imco, or stainless marine vs stock ?
Just curious..........thanks
11-20-2002, 02:21 PM
#14
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Posts: n/a
Aftermarket exhaust
If you want the most power from a high horsepower small block engine you need something better than the stock exhaust manifolds but there isn't much on the market for the SB.
A small block, with only 350 cubic inches, doesn't create as much exhaust volume as a big block with 454 cubic inches. An engine with 104 more cubic inches creates a lot more exhaust volume that needs to be extracted from the engine. Look at it this way, if a big block needs an 800 cfm carb and the small block only needs a 600 cfm carb (on the inlet side) the same holds true for the exhaust side.
The stock mercruiser manifolds on a 350 do not create as much backpressure as the stock mercruiser manifolds on a 454. There is a much bigger improvement in performance when changing the big blocks exhaust than when changing the small blocks exhaust.
The four inch exhaust (or even 3 inch) from the exhaust manifolds to the transom (or even through the prop) is huge for a small block engine, not so huge for a big block engine (2 1/2 is large for a car exhaust!).
Dennis Moore
FAMILY AND PERFORMANCE BOATING MAGAZINE
A small block, with only 350 cubic inches, doesn't create as much exhaust volume as a big block with 454 cubic inches. An engine with 104 more cubic inches creates a lot more exhaust volume that needs to be extracted from the engine. Look at it this way, if a big block needs an 800 cfm carb and the small block only needs a 600 cfm carb (on the inlet side) the same holds true for the exhaust side.
The stock mercruiser manifolds on a 350 do not create as much backpressure as the stock mercruiser manifolds on a 454. There is a much bigger improvement in performance when changing the big blocks exhaust than when changing the small blocks exhaust.
The four inch exhaust (or even 3 inch) from the exhaust manifolds to the transom (or even through the prop) is huge for a small block engine, not so huge for a big block engine (2 1/2 is large for a car exhaust!).
Dennis Moore
FAMILY AND PERFORMANCE BOATING MAGAZINE
