[buckeyedemon]

The joys of bench racing!

ha. i agree.

 

[txtrailerdaddy1]

Might be a typo but no way is a 302 60% lighter than a 351W...A 289/302 is roughly 460 lbs to a 351 at about 510lbs..

I'm betting he meant to hit the # and hit the % instead.

 

[ozarks06]

Theres no replacement, for displacement!

Except for boost, juice (NO2), RPM (Ferrari F12 makes 740 HP from 378 ci N/A @ 8250 RPM on a streetable [well, sort of] engine), and of course $$$$ (the F12 is $310,000).

 

[caveeagle]

Like modern sport bikes that make ungodly power for their engine displacement also have redlines up to 16000 rpm.

What sportbike out there redlines @ 16k rpm? I know they wind up pretty high, but that seems to be a bit of an exageration.

 

[StrokerDude]

MY coworker's new BMW bike has a tach to 16K. Think redline is from 14K to 16K. These new bikes are truly insane with their power...



EDIT: Yup, here it is on some review website...

 

[Maxum96]

What sportbike out there redlines @ 16k rpm? I know they wind up pretty high, but that seems to be a bit of an exageration.

I know that seems insane, but they're out there. I remember back in the 80's a friend had a Honda that redlined above 12,000. It would rev stupid fast. Now 25 years later that bike would be a slug.

 

[OCHOHILL]

The 347 vs 351w is discussed at length here. You may need to be a member to view it.

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On edit, you do.

The jist of it is the lighter rotating mass makes a tremendous difference, especially when going for all out power. Thus the 347 is the better way to go, powerwise.

 

[GypsyR]

Lifted fom the first Wikipedia entry I came across-
"For example, the Honda CBR250RR has a redline of about 19,000 rpm"
Let's throw Formula One cars into it. Another random lift -"At the end of the 2006 season, Formula One engines typically used a 20,000 RPM redline" Interestingly enough the redline of F1 engines is dictated by the rules, not by how far the builders can and will take them.

 

[frdnut]

But what about the 351's longer stroke (i.e. more torque)? Torque is what wins drag races most of the time.

I would disagree and say its hp that wins drag races (assuming correct gearing of course)..You can have a tractor engine with 1000 ft/lbs of torque but it ain't gonna be quick..Torque is what gets mass moving but hp determines how quickly...

 

[kwkenf]

HP is how fast you hit the wall
TQ is how far you push the wall

 

[buckeyedemon]

The 347 vs 351w is discussed at length here. You may need to be a member to view it.

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On edit, you do.

The jist of it is the lighter rotating mass makes a tremendous difference, especially when going for all out power. Thus the 347 is the better way to go, powerwise.

looked like a bunch of the same types of generic posts as here. i didn't see much real information. one person actually posted something about rotating weight, but i think that's somewhat garbage as i had mentioned earlier (and yes, weight away from the crank does produce loads much greater than the gram weight difference).

the best one was the person who mentioned the story of switching shortblocks (351w to 347) and reducing the 1/4 time slip from 12.20 to 11.20. what a load.

 

[cmefly]

looked like a bunch of the same types of generic posts as here. i didn't see much real information. one person actually posted something about rotating weight, but i think that's somewhat garbage as i had mentioned earlier (and yes, weight away from the crank does produce loads much greater than the gram weight difference).

the best one was the person who mentioned the story of switching shortblocks (351w to 347) and reducing the 1/4 time slip from 12.20 to 11.20. what a load.

I would suggest you do a seach on the CORRAL forum on the subject. It has been discused by engine builders such as Jim woods. Lots of good info on the 302/351w on that site. I would not discredit the 347 vs the stock stroke 351W. You need to keep in mind that most people who run a 351W with the stock stroke are using the stock crank. If you are going to spend the money on a aftermarket crank, rods and lightweight pistons 99 out of a 100 people would be doing a 408 stroker for the same money. There is not a huge difference between the 2 engines but the 347 will win for reasons already stated. The extra cubes and stroke of the 351W is not enough to overcome the slight advantage of the 347. in a street car you would not notice the gain. Do some research and see what you think. Mike

 

[cmefly]

this was discused here last year with some of the same guys. lots of good info.
http://forums.vintage-mustang.com/vintage-mustang-forum/637253-347-vs-351-a.html

 

[buckeyedemon]

I would suggest you do a seach on the CORRAL forum on the subject. It has been discused by engine builders such as Jim woods. Lots of good info on the 302/351w on that site.

i've just never really seen the evidence. i feel like most of the time it's people repeating info (same thing occurs on the corral) without really trying to understand what they're talking about.

 

[Fstbk]

If I went to the trouble to shove a 351 in my 65 it would need to be a 427.

 

[Maxum96]

I would disagree and say its hp that wins drag races (assuming correct gearing of course)..You can have a tractor engine with 1000 ft/lbs of torque but it ain't gonna be quick..Torque is what gets mass moving but hp determines how quickly...

You said it, gearing. Why do you think today's diesel trucks are so fast? They don't make that much horsepower. They make tons of torque. And they're geared for that torque. You won't see them running high gears in the rearends.

 

[Maxum96]

the best one was the person who mentioned the story of switching shortblocks (351w to 347) and reducing the 1/4 time slip from 12.20 to 11.20. what a load.

I guess all the Pro Stock drag racers will be turning in their 500ci big blocks and moving to small blocks! LOL

 

[Westmus]

If the 347" can make the power needed, the additional weight in front of the car from a 351" is a draw back no matter how the car are going to be used. Believe a stock 289" Mustang have about 57% weight on the front wheels. That's really bad if you want best handling and traction. You can make a Mustang handle and hook, but all that weight on the front is working against you. Removing weight from the front vill help you.

 

[frdnut]

the best one was the person who mentioned the story of switching shortblocks (351w to 347) and reducing the 1/4 time slip from 12.20 to 11.20. what a load.

Have you tried it?

 

[ripped]

Do what you like. The 302 block is a little smaller. The aftermarket blocks are pretty stout.

I like the stealth factor, you can build in to a 347, while putting a 289 sticker on the air cleaner.

The difference in stroking a smaller motor, ends up often being a discussion about pistons and clearancing.

So sometimes strokers end up with the wrist pin intersecting the oil ring. Also you can end up with a shorter skirt piston. There are some consequences to having the oil ring intersected, and a shorter skirt.

There are sometimes block clearance issues with a stroker.

You are likely going to want heads which flow just as well, for the 347, as a 351.

The biggest issue, in my mind, is the stroker kit itself.

Some of them are crap. They have badly machined cranks and pourous castings. Eagle cranks had some issues in the past.

There is nothing wrong with either engine