GT350

I built this 347 in May, and I must say....it was a BEAST! It was making gobbs of HP and a tron of torque and I had'nt been beaten yet. Now the bad news, I was racing a guy with all the Trickflow goodies and was pulling him hard in 2nd, then shifted to 3rd and ....no more motor. So after I drag it home, I finally start pulling parts and at first thought I'ld broke the timing chain, the motor never made a sound when it shut down, anyway finally get the timing cover off and the crank broke right at the timing gear just after the bearing.WTF? Any ideas, it was a Eagle rotating assembly, 1300 miles, I was very pleased with this motor, and will build it again after I see if there is any more damage, don't think so but havent gotten that far yet, Tell me what you think caused this.BTW I had the correct 28oz. balancer on it.

only90s

Call Eagle and say WTF....

Years ago when I had a Big Block Chevy that I built...a cam from Crane Cams snapped and I bitched big time....They ended up giving me like 2k in parts to make up for the money I had to rebuild....

mattdel

honestly that seems to be a growing problem with stroker kits in 302's.
i'm no machinist so i couldnt say why, tho.

5.0kid

+1^ i would call them and tell them u demand a new crank and internals if they are busted also. On what caused it i would have to say maybe a bad or old cast that they were using. they might need a new cast

FivePointOhh

i really suggest this, when i had issues when i had my crank sent off they sent back the wrong crank, it fit and it plastigauged up just right. i started driving the car and it basically hit the grave at about 100 mile on the rebuild. called the company and i told them the stamped number on the crank and they paused...."oops"

i got my crank back that they sent wrong and they replace my bearings that were chewed up and all new gaskets....nothing else was really damaged.

aode08

https://mustangforums.com/m_2276831/mpage_1/key_/tm.htm if you gonna stroke use forged cranks, 1M sucks at high revs.


Machine shop balance error and over reving - 6,000 rpm also a concern with cast crap

FivePointOhh

slacking on the quality control.....

67mustang302

Yeah, that sounds like a quality issue, the crank prolly had a defect in it. As far as strokers, yeah, cast is a bad idea on strokers, especially 347's

r.barn

Cast steel cranks are fine, you should break a block before a cast steel
crank unless you hydro lock it or something.

You obiviously just had a defective crank either from Eagle or from the machining/assembly process

and what rpms were you spinning it to?

ZachW04Stang

Eagles stuff is now made in china and not the usa anymore. Wonder if that has anything do with it?