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392 Hemi Old Style #1075219 09/14/11 08:43 PM 09/14/11 08:43 PM
Joined: Oct 2003 Posts: 108 Wisconsin M MagnumExpress OP member
MagnumExpress OP member M Joined: Oct 2003 Posts: 108 Wisconsin	I am building a motor for a freind and am wondering if anyone knows how much these motors can be over bored. it is at .030 over now. #9 in the world. 2006 IHRA Super Rod 2010 IHRA Div.5 Hot Rod Champion

Re: 392 Hemi Old Style [Re: MagnumExpress] #1075220 09/14/11 10:01 PM 09/14/11 10:01 PM
Joined: Jan 2003 Posts: 6,392 nielsville, minn. Q quickd100 master
quickd100 master Q Joined: Jan 2003 Posts: 6,392 nielsville, minn.	I believe they were pretty stout cylinders but give 'Triwaters' on Moparts a shout, he's an expert on the whale motor. Dave

Re: 392 Hemi Old Style [Re: MagnumExpress] #1075221 09/14/11 11:20 PM 09/14/11 11:20 PM
Joined: Aug 2003 Posts: 43,206 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,206 Bend,OR USA	Quote: I am building a motor for a freind and am wondering if anyone knows how much these motors can be over bored. it is at .030 over now. I have seen 392 blocks crack cylinders when bored .090 over Don't bore it any more than you absolutely have to, the orignal blocks where designed to be small bores(3.750 was stock on the 331 if I'm remembering correctly) once Mopar changed the bore size to 4.00 they had to make and design another motor( B&RB) for production use I have ran a lot of the early Chrysler Hemi motors I like them a lot but they do have thier limits If your friend is looking to go all out on a early style 392 motor have him look at the Donovan blocks and Hot Heads aluminum cylinder heads BTW, back in the day .060 was consider the max you wanted to bore a 392 block, regardless of which block, standard, RR or A-1 block Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: 392 Hemi Old Style [Re: Cab_Burge] #1075222 09/15/11 02:58 PM 09/15/11 02:58 PM
Joined: Jan 2009 Posts: 149 Rancho Cucamonga,Ca 3 392charger member
392charger member 3 Joined: Jan 2009 Posts: 149 Rancho Cucamonga,Ca	My 1957 A-1 block is .080 over. Never been a problem but to be fair it a rather mild 13 second street motor with a cam/headers/intake. And I agree with Cab. I wouldn't want to lean on mine real hard at .080 over.

Re: 392 Hemi Old Style [Re: 392charger] #1075223 09/15/11 04:19 PM 09/15/11 04:19 PM
Joined: Sep 2005 Posts: 12,481 Chino Valley RodStRace I Live Here
RodStRace I Live Here Joined: Sep 2005 Posts: 12,481 Chino Valley	If it's going to have any cojones, have the thing sonic checked (the best answer) and check piston availability first!

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