331 or347
09-25-2006, 10:17 PM
#1
1st Gear Member
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Join Date: Sep 2006
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Posts: 107
331 or347
what is the all around better motor i heard the 347 puts to much presure on the cylinder walls and breaks blocks any truth to this ???????????????
and the 331 raps out alot faster in the rpms
and the 331 raps out alot faster in the rpms
09-25-2006, 11:23 PM
#4
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Join Date: Apr 2005
Location: hagerstown, maryland
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RE: 331 or347
347 burn oil .... i forget why i think it has sumthin to do with how the rod is pushed up into the piston or sumthin and the rings leak...idk but my freind has a 347 ac cobra and it burns oil .... he says they all do
09-26-2006, 12:32 AM
#8
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Location: IL
Posts: 9,644
RE: 331 or347
ORIGINAL: 91lxstang
347 burn oil .... i forget why i think it has sumthin to do with how the rod is pushed up into the piston or sumthin and the rings leak...idk but my freind has a 347 ac cobra and it burns oil .... he says they all do
347 burn oil .... i forget why i think it has sumthin to do with how the rod is pushed up into the piston or sumthin and the rings leak...idk but my freind has a 347 ac cobra and it burns oil .... he says they all do
09-26-2006, 01:45 AM
#10
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Join Date: Jan 2006
Location: So-Cal
Posts: 2,645
RE: 331 or347
a 331 has a better rod ratio
a current Ford crate engine using the X303 heads make simular numbers, the 302 is advertized at 345 HP while the 351 only produces 40 more HP. The real difference is the extra torque of the longer rods, 377 ft pounds for the 351 versis 305 ft pounds for the 302....so, using what we know about different ratios, horsepower per inch, the 331 should produce more hp and less torque per inch than a 347....
a current Ford crate engine using the X303 heads make simular numbers, the 302 is advertized at 345 HP while the 351 only produces 40 more HP. The real difference is the extra torque of the longer rods, 377 ft pounds for the 351 versis 305 ft pounds for the 302....so, using what we know about different ratios, horsepower per inch, the 331 should produce more hp and less torque per inch than a 347....