302 or 347

VeNuM · 03-27-2003, 11:06 AM

sn95gt19: I am good friends with a reputible engine builder/tuner who builds many Renegade motors. From what he's seen over the 25 years he's been in the business is that maybe the 3rd ring theory is a myth, but 347's cause accelerated wear on the cylinders. I've seen some of them and after a year or so the cylinders are all marked/scratched up. This wasn't one instance either, he told me he's seen it 3 times. Now if this were my motor, I would choose a 347 for a weekend/strip car, and a 331 for a street/strip car. I was going to build a 331 myself but decided to step it up to the Windsor block. So my bottom line is I believe 347 are more of a race motor that is going to be freshen up every once in awhile, as opposed to a street motor that will be driven 100k+ miles before being worked on. And 93GTDIN, a 331 is a 3.25 stroke with a 4.030 bore, I think you're thinking of a 327 if you want to stay with the stock 4.000 bore, but I definately agree with you and a 331 will last longer than a 347. ~Brian

03-27-2003, 11:06 AM	#15
VeNuM Registered Member Join Date: Apr 2002 Location: Downers Grove, IL Posts: 464	sn95gt19: I am good friends with a reputible engine builder/tuner who builds many Renegade motors. From what he's seen over the 25 years he's been in the business is that maybe the 3rd ring theory is a myth, but 347's cause accelerated wear on the cylinders. I've seen some of them and after a year or so the cylinders are all marked/scratched up. This wasn't one instance either, he told me he's seen it 3 times. Now if this were my motor, I would choose a 347 for a weekend/strip car, and a 331 for a street/strip car. I was going to build a 331 myself but decided to step it up to the Windsor block. So my bottom line is I believe 347 are more of a race motor that is going to be freshen up every once in awhile, as opposed to a street motor that will be driven 100k+ miles before being worked on. And 93GTDIN, a 331 is a 3.25 stroke with a 4.030 bore, I think you're thinking of a 327 if you want to stay with the stock 4.000 bore, but I definately agree with you and a 331 will last longer than a 347. ~Brian __________________ 1989 Black Mustang GT Hatchback, Underdrive Pulles, Electric Fan, Cold Air Intake, Headers, Offroad H-Pipe, Magnaflow catback, Steeda Tri-Ax, Fluidyne Aluminum Radiator, Timing at 14*, 3.73's Coming not so soon: 408w Ricer Hater's Club Member #59