347 lifespan?
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5.0Droptop
...all those nights we shared, and you're a dude??
Special Agent Mukity-Muck Whats in Charge Round Here
Honestly alot of that is determined by how much you put into it when you build it. If it is built right and maintained properly and not ragged on all the time it should last as long as any other engine.
My experience has been the rings wear out faster then normal. Put the best rings in it you can get.
My experience has been the rings wear out faster then normal. Put the best rings in it you can get.
mrmustangman357
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- Feb 11, 2007
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JH96GT
Founding Member
1991vert
10 Year Member
Imagine that you have just bought a brand new 5.0 Mustang. Take it out and beat the balls off of it like you know you're gonna do with a 347...how long would you expect a new engine to last under race conditions? Most of the high mileage 302s you hear about are the ones that are driven and not raced. I would expect to do a rebuild at least by 50k miles even with the best rings and bearings, and especially new valve springs if you have a radical cam and wind out the RPMs a lot.
Well my stock '85 short block has over 250k on it and it doesn't even smoke, and every time it gets driven it seens wide open throttle and at least 5k RPM more than a few times.
All depends on the builder.
Rings take the brunt of the wear anyways.
Technically a 302 would lost longer than a 331, and a 331 would last longer than a 347. But the reality is, it is not going to be noticeable with a good builder.
Take a gander at the Stroker Information link in my signature.
I propose a 1.175" piston/5.315" rod/3.4" stroke for most N/A situations.
The builder is everything...
Good Luck
Rings take the brunt of the wear anyways.
Technically a 302 would lost longer than a 331, and a 331 would last longer than a 347. But the reality is, it is not going to be noticeable with a good builder.
Take a gander at the Stroker Information link in my signature.
I propose a 1.175" piston/5.315" rod/3.4" stroke for most N/A situations.
The builder is everything...
Good Luck
Well, compared to the extreme piston to rod angles that a 347 sees, yeah a little, but in the end it's still gonna come down to how hard you drive it. You could build a 347 and use it as a law abiding never raced never rev limiter bounced daily driver and probably get well over 100k out of it. It's the abuse that shortens their lifespan more than anything.
just4bob50
Active Member
My 347 has been waiting to be installed since December, so at the rate Im going my 347 will last forever!!!!!!
