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426 hemi std bore? #958797 03/26/11 12:14 AM 03/26/11 12:14 AM
Joined: Jan 2003 Posts: 6,743 central new york pettyblue440 OP master
pettyblue440 OP master Joined: Jan 2003 Posts: 6,743 central new york	what is the std bore size of a 426 hemi? thanks, jon

Re: 426 hemi std bore? [Re: pettyblue440] #958798 03/26/11 12:15 AM 03/26/11 12:15 AM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	4.250 "The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."

Re: 426 hemi std bore? [Re: 1_WILD_RT] #958799 03/26/11 12:16 AM 03/26/11 12:16 AM
Joined: Jan 2003 Posts: 6,743 central new york pettyblue440 OP master
pettyblue440 OP master Joined: Jan 2003 Posts: 6,743 central new york	that was fast. thank you!

Re: 426 hemi std bore? [Re: pettyblue440] #958800 03/26/11 12:24 AM 03/26/11 12:24 AM
Joined: Jan 2003 Posts: 6,743 central new york pettyblue440 OP master
pettyblue440 OP master Joined: Jan 2003 Posts: 6,743 central new york	may as well hijack my own thread. how much of an overbore can these blocks take? Is it like a wedge being limited to .030 or .060, or can it go more after being checked out?

Re: 426 hemi std bore? [Re: pettyblue440] #958801 03/26/11 12:48 AM 03/26/11 12:48 AM
Joined: Aug 2003 Posts: 43,115 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,115 Bend,OR USA	Quote: may as well hijack my own thread. how much of an overbore can these blocks take? Is it like a wedge being limited to .030 or .060, or can it go more after being checked out? All blocks should be thoroughly sonic tested before boring, stuff happens when you don't know. Are you talking about a old OEM Hemi block, a new Mopar replacement block or what block are you asking about? Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: 426 hemi std bore? [Re: Cab_Burge] #958802 03/26/11 01:09 AM 03/26/11 01:09 AM
Joined: Jan 2003 Posts: 6,743 central new york pettyblue440 OP master
pettyblue440 OP master Joined: Jan 2003 Posts: 6,743 central new york	it is an oem 66 or 67 I am looking at. It says it has been checked out and the final bore would be 4.380. Any chance the walls are that strong?

Re: 426 hemi std bore? [Re: pettyblue440] #958803 03/26/11 01:14 AM 03/26/11 01:14 AM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	4.38 or 4.28... 4.28 is .030 over & while it should be sonic checked it's probably fine... 4.38 is .130 over & that isn't gonna work.... "The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."

Re: 426 hemi std bore? [Re: 1_WILD_RT] #958804 03/26/11 03:28 AM 03/26/11 03:28 AM
Joined: Aug 2003 Posts: 43,115 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,115 Bend,OR USA	Quote: 4.38 or 4.28... 4.28 is .030 over & while it should be sonic checked it's probably fine... 4.38 is .130 over & that isn't gonna work.... I have sonic tested a lot of Mopar blocks, old and new, including some of the new (pre World brand blocks) replacement blocks from Mopar, not the newer World blocks as all of the cast iron World blocks are thick wall siameze bores. I don't think any of the old OEM ones will bore safely beyond 4.320 that I tested Of course it depends on how much cylinder wall thickness you want left after the bore I like at least .150 minimum on the major thrust side of the cylinders on a mild street performance motor Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

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