5spd GT said:Let me say it again...more reasons...because the 331 is different, less aggressive rod ratio, more piston material, and the majority of the time the 331 doesn't have to be "stroker clearanced"...
Pokageek said:"I even have seen many say a gear ratio of 3.55 will keep your car from turning too many rpm's when cruising at highway speeds so that is why you don't want to consider the next step up which is the 3.73 ratio."
Um, I have had both and 3.55's do spin the engine lower rpm's. Any RPM calculator will tell you that. Not sure what your point is on that "ratio" (pun intended)
"The small amount of truth in it is blown up to represent WAY more of a disadvantage than it REALLY is."
Ok, true.
final5-0 said:I even have seen many say a gear ratio of 3.55 will keep your car from turning too many rpm's when cruising at highway speeds so that is why you don't want to consider the next step up which is the 3.73 ratio.
That is the thing about a lot of info you hear .................
Grady
HGFireHazard said:I tried finding the link to that calculator I thought you posted a couple of weeks ago Grady but I couldn't find it. I get somewhere around 80 RPMs difference, how accurate is that to your answer?
Blk91stang said:To add some fuel to the fire, B&B Performance who does A LOT of 5.0 motors was not impressed by the difference between 347's and 331's. He has an in-house dynamometer and hasen't noticed a difference between 331's and 347's. For all the people that say 331's suck, um, won't they make more power than a 302??? Let the guy buy what he wants. It's not your money is it? One of my good friends makes 345rwhp with his 302 running a .545 lift cam and afr 165's.
BACK TO THE TOPIC!!!!
I think you'll make over 330rwhp no problem, a little more if you get a cam that will put those AFR 165's to work!! You should be low 12's no problem!
Black95GTS said:Yes, it is different. It's different because anyone building a stroker motor would want more power for the same money. I would indeed call someone "different" (and probably some other things as well) that wanted a NA 331 stock blocked motor over a 347 for the uniqueness of it. The only thing unique about the 331 is that it is uniquely slow.
Black95GTS said:If you are going to put the poster's internals into a 331 and dyno tune it, and then a 347 and dyno tune it, which one gets you down the 1320 first? My money is on the 347.
final5-0 said:No prob my friend ... I have it handy
Here you go
http://www.allfordmustangs.com/Detailed/608.shtml
Grady
5spd GT said:Lol, your just jealous because there isn't a big difference in power between them. So do you call people that have a 393 instead of a 408 "different"...
I think you missed the point...
Back to the dart board for ya...
So is the 347 so much faster. 16 cubes will kill any other car huh?
So according to Adam's theory and bias, 331's are slow and 347's are fast
Yep, mine 2...
What's your point? That it is a bit quicker?
Whoopdeeduu...
Black95GTS said:My point is if you already have the internals you are going to use, and you are building a stroker, why wouldn't you build the one that makes the most power?
Adam
Blk91stang said:Right there proves you have NO CLUE what your talking about. You have officially thrown off all we know about mathematics and now the Earth is going to explode. Good Job.
Blk91stang said:ok, first prove it makes more power other than saying "more cubes = more power". There's many variables to an engine other than displacement.
Blk91stang said:ok, first prove it makes more power other than saying "more cubes = more power". There's many variables to an engine other than displacement.
Black95GTS said:Agreed. But back to the original post, there aren't those variables in this situation. He has the parts already. Are you telling me that all else being equal, a 331 will equal a 347 in power output? Say you take the recommended RPM limit of the track heat, which is 6500 I believe. Rev both engines, all else being equal to 6800 or so. I will bet that the 347 betters the 331. I will also bet that the car with the 347 is faster on the track and on the street.
I'm saying, with the parts the poster has, he will make more power in a 347 then in a 331. That's all. I'm not saying a 331 is better/worse in general. In this application, it makes more sense to to go 347.
Adam
divit250r said:
His point was that all things being equal but the gears, 142 rpm at 60 mph is not going to affect the fuel mileage enough to notice. The driving style is what does it. I think some people on here get all stressed out over details sometimes... $.02
Scott