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'72 motorhome 413 max safe overbore #80350 06/26/08 11:48 PM 06/26/08 11:48 PM
Joined: Jan 2003 Posts: 2,734 Charlotte, NC 4 446acuda OP master
446acuda OP master 4 Joined: Jan 2003 Posts: 2,734 Charlotte, NC	What is the max safe overbore on a '72 motorhome 413--the kind with the weird heads and water pump deal. Just want a ball park answer since I haven't bought it yet and it is still in the motorhome so I can't get it sonic checked. thanks

Re: '72 motorhome 413 max safe overbore [Re: 446acuda] #80351 06/27/08 12:18 AM 06/27/08 12:18 AM
Joined: Aug 2003 Posts: 12,291 Kent, Wa 340SHORTY Truck Nut
340SHORTY Truck Nut Joined: Aug 2003 Posts: 12,291 Kent, Wa	as in most cases .060 max I believe IIRC the 413 bore is the same as a 383, I may be wrong tho.. I am truckless..

Re: '72 motorhome 413 max safe overbore [Re: 340SHORTY] #80352 06/27/08 12:28 AM 06/27/08 12:28 AM
Joined: Jan 2003 Posts: 2,734 Charlotte, NC 4 446acuda OP master
446acuda OP master 4 Joined: Jan 2003 Posts: 2,734 Charlotte, NC	Bore is ~4.18 compared to 383/426 at 4.25. I thought I heard somewhere that these 413 industrial blocks could be bored to 4.32 or more .

Re: '72 motorhome 413 max safe overbore [Re: 446acuda] #80353 06/27/08 01:22 AM 06/27/08 01:22 AM
Joined: Jan 2003 Posts: 8,064 Arlington, Texas earlybee master
earlybee master Joined: Jan 2003 Posts: 8,064 Arlington, Texas	Safe overbore is less. Try to minimize the bore job, makes for a better ring seal for more power with a thicker(less flex) jug. Look at the middle of the page by Larry Shepard, http://www.mopar.com/muscle/tech1005.htm

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