240 & 300
Senior User
Joined: Jul 2001
Posts: 470
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240 & 300
The 240 and 300 are the same block. The main differences being the crank/rods/pistons. As for porting the heads, I found an article the other day on porting the BB6 and SB6 heads, but they had no pictures. 
Otherwise you can just use a regular porting guide (http://www.sa-motorsports.com/diyport.htm). IIRC the stock combustion chamber on a 240 is 68cc.
-=Whittey=-
Otherwise you can just use a regular porting guide (http://www.sa-motorsports.com/diyport.htm). IIRC the stock combustion chamber on a 240 is 68cc.-=Whittey=-
Hotshot
Joined: Oct 2002
Posts: 18,488
Likes: 22
From: The Big, Oregon
240 & 300
Same pistons, different crank, different rods. The 300 crank can be used with 240 rods and short pistons, to make a long rod motor. And yes, you can just drop a 240 crank and rods into a 300, but the combustion chambers on most older 300-6's were 74cc, vs 64-68 for the 240.
Post Fiend
Joined: Jan 2000
Posts: 5,330
Likes: 17
From: Dryden, ON, Canada
240 & 300
240 pistons aren't the same as 300 pistons. The 300 uses a 300 specific piston(a 351W piston can be used with some pin sizing work, in my setup, I ended up with floating pins) while the 240 uses a 302 piston.
Evan
Evan
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