331 vs 347

Topic: 331 vs 347 (Read 4591 times) previous topic - next topic

331 vs 347

May 23, 2006, 04:14:25 AM

Ok, so the shop that I will one day hopefully be getting a new motor from charges the same price for a 347 as they do the 331. I've always loved the uniqueness of the 331 and how it makes amazing power while being a relatively small displacement. I also like the very good bore/stroke ratio. My dilema is, would I be better off just stepping up to a 347 for the same price? I've never really done much reading on 347's, I only know that it's the max a 302 can be bored and stroked. I would assume that it's going to make more power if I build it identical to how I want my 331 to be. From what I've researched the 331 will make power between 2500 to 6500 RPM, does that sound unlikely for a 347? All in all I want to get the most bang for my buck, but at this point I'm still pretty much set on the 331 untill I figure out more. I know some of you guys have experience with both these engines, so lemme know your thoughts and opinions. Thanks

Paul

331 vs 347

Reply #1 – May 23, 2006, 05:11:35 AM

I think the 347 would out power it in every situation. But it is basically the max you can do. A 331 can at least be rebuilt. Just think about it this way, even with all the same parts, (heads, cam ect) the 347 will still make more power.

331 vs 347

Reply #2 – May 23, 2006, 12:05:25 PM

keep the standard bore of the block and put the 347 kit in it, would make it like 342 so if something happens you can atleast bore it out a little?

331 vs 347

Reply #3 – May 23, 2006, 12:23:57 PM

Quote

keep the standard bore of the block and put the 347 kit in it, would make it like 342 so if something happens you can atleast bore it out a little?

yeah same idea with a 306 max bored. so if something screws up the walls. that block is unless you sleav it . but roller blocks are plentyfull.

331 vs 347

Reply #4 – May 23, 2006, 12:55:38 PM

well. if you are goign to be pushing the engine alot, the 347 is the MAX it can go. so i are really at the limits of the block.. where the 331 is a good improvement, but you still have some block left. and the power won't be that much of a difference. a few hp.

331 vs 347

Reply #5 – May 23, 2006, 01:37:48 PM

you can get a 302 to more then just 306, 306 is only .030 over, ive seen but dont recommend people doing .060 to make it around 311.

331 vs 347

Reply #6 – May 23, 2006, 04:40:48 PM

Here is a really good article from MMFF on the 331. The extra cubes from the 347 will give you more torque but they have a reputation for being unreliable (piston rings). But those problems have been mostly fixed now with the newer kits.

http://www.dssracing.com/images/articles/331%20Ways%20to%20Waste%20an%20LS1%20PT2.pdf

331 vs 347

Reply #7 – May 23, 2006, 07:44:16 PM

Quote from: thesoldan

Here is a really good article from MMFF on the 331. The extra cubes from the 347 will give you more torque but they have a reputation for being unreliable (piston rings). But those problems have been mostly fixed now with the newer kits.

http://www.dssracing.com/images/articles/331%20Ways%20to%20Waste%20an%20LS1%20PT2.pdf

Thanks, that was a good article. I'm basing my build off of the 200 MPH Mustang article that is in MM&FF, I'll just be using different heads and intake. They tried it once with a 347 and the guy wasn't satisfied with it. Either way, I wouldn't even be considering the 347 if it weren't for the fact that it is the same price. I think I like the fact that if I somehoe (God Forbid) mess up this motor, I still have leway to fix the block. And while the extra torque is nice, It won't be that large a number to make me want to switch. This is all still very far down the road however, so I'll keep my options in mind.

Thanks for all you replys.

331 vs 347

Reply #8 – May 23, 2006, 10:21:36 PM

While I don't have much practical experience with V8's, I've always liked the 331's...mostly because that while they have supposedly fixed the 347's oil burning problems, the wrist pin is still up there in the oil control ring and I don't care for that. Plus everyone gets a 347, it's different to get a 331

331 vs 347

Reply #9 – May 23, 2006, 10:45:30 PM

OK lets settle all of this at once

331= 30 over 3.275 stroke 5.315 rod
347= 30 over 3.400 stroke 5.400 rod
CHP 347= 30 over 3.400 stoke 5.315 rod
so with that being said go cubic inches the CHP kit does not have the oil ringsin wrist pin, however i have ran a 347 with wrist pin oil ring and no trouble, call Bruce at CHP 1-310-784-1010 and talk to them you can not beat their price, quality, customer service tell him Ron from Precision Tune sent you if you need any further info on what to build and how to make power with the right combo please contact me 734-776-5987 or rpm121370@yahoo.com

Ron

331 vs 347

Reply #10 – May 24, 2006, 05:14:07 PM

I've heard of a 3.47" crank being used. With a .030 over bore it gives 354...

I'd love to have one of the Man-O-War blocks that will take a .150+ overbore. I just can't see spending $2300 for a block though...

Still 4.15 x 3.4 = 368cu in...

I know a 372cu in version is available as a complete engine for $8500 or so from Summit..

331 vs 347

Reply #11 – May 31, 2006, 02:38:04 AM

I haven't heard anyone talk about piston speed. Anyway, a 331 and a 347 are both bored 0.030" over so...why is everyone talking about being able to rebuild a 331 and not the 347?...both would be screwed.

I don't know exactly what you want from your engine, but on a higher output application, the 347 will be significantly down on power above 6,000rpm...and the extra torque down low doesn't really justify it.

That's why I've said it all, plans for a 392 are in motion for me. :D

331 vs 347

Reply #12 – May 31, 2006, 07:27:10 PM

dude what are you talking about my 342 pulls well past 6000 rpm i shift at 6800 rpm if you set the motor the right way the first time you need to talk to professionals to get proper combo or ask someone that has a good combo for advise,

331 vs 347

Reply #13 – May 31, 2006, 08:41:17 PM

Building a 331 over a 347 (for the same price) is like building a 2 Car Garage and not a 2 1/2 Car Garage for the same price. Why? I understand being unique, but that's something no one can see. I wanted a 327 stroker (just to be different and it's basically a 331 without the overbore) but since 347s are the same price I really didn't see the point of leaving horsepower on the table.

331 vs 347

Reply #14 – May 31, 2006, 09:17:29 PM

exactly darkthunder

and to be unique who the f*ck really cares who knows what is inside the engine unless you tell. everyone thinks that i have a 327 now but they will never know what is really inside, build Cubic inch, there is no replacement for displacement! you can builld a very welll mannered 342 or 347 that will kick ass run 10's and drive to and from the track.