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Best way to notch bores / chamfer cylinder bore tops? #590313 01/21/10 04:38 PM 01/21/10 04:38 PM
Joined: Jan 2003 Posts: 15,439 Val-haul-ass... eventually B BradH OP Taking time off to work on my car
BradH OP Taking time off to work on my car B Joined: Jan 2003 Posts: 15,439 Val-haul-ass... eventually	The shop that did the machine work on my 448 block did a really crappy job chamfering the tops of the cylinder bores. Since I'm going to have to clean up their work, I figured I should notch the tops of the bores for valve-to-cylinder wall clearance, too. What's the best approach to do both of these jobs? Any special tools recommended? The top ring lands are only about .250" down from the piston crown, so there's a limited amount of room to work in. Thanks. - Brad

Re: Best way to notch bores / chamfer cylinder bore tops? [Re: BradH] #590314 01/21/10 04:44 PM 01/21/10 04:44 PM
Joined: Oct 2003 Posts: 11,719 W. Kentucky justinp61 I Live Here
justinp61 I Live Here Joined: Oct 2003 Posts: 11,719 W. Kentucky	Do you're head gaskets have an offset for the valves? If they do use it as a guide, otherwise I wouldn't do the reliefs.

Re: Best way to notch bores / chamfer cylinder bore tops? [Re: BradH] #590315 01/21/10 04:45 PM 01/21/10 04:45 PM
Joined: Aug 2003 Posts: 44,171 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 44,171 Bend,OR USA	Are you sure you need to notch the bores for valve clearnance? As far as chamfering the bores it take a special tool on the boring bar or a conical tapered stone that can be used on a drill motor, they work, there crude also. Last edited by Cab_Burge; 01/21/10 04:46 PM. Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Best way to notch bores / chamfer cylinder bore tops? [Re: BradH] #590316 01/21/10 04:53 PM 01/21/10 04:53 PM
Joined: Jan 2003 Posts: 6,591 Canton, Ohio S Sport440 master
Sport440 master S Joined: Jan 2003 Posts: 6,591 Canton, Ohio	Using a steel shim I clearenced/relieved the head chamber at its tightest spot at the valves. I then marked the gasket at its relieve points and transfered that same clearence to the block using it as a Template for chamfering. To save Compression I didnt chamfer the exhaust as much, as I feel the intake side is the most benificial. I used a medium bit carbide grinder. The results before and after with the Intake valve set at .550 lift was very appearant as viewed from the bottom side of the clyinder. mike EDIT, Also it wasnt done for clearence. It was done for a smoother more open intake flow near its highest velocity flow path. At minumum, I think all the BB engines could see a improvement by at least breaking the Sharp bore edges at those points. Last edited by Sport440; 01/21/10 05:00 PM.

Re: Best way to notch bores / chamfer cylinder bore tops? [Re: BradH] #590317 01/21/10 04:57 PM 01/21/10 04:57 PM
Joined: Mar 2008 Posts: 307 OH T TheBlackCar enthusiast
TheBlackCar enthusiast T Joined: Mar 2008 Posts: 307 OH	I prefer the shop not chamfer the top. As far as unshrouding the block, blue up the deck surface and then put the heads on the bare block. Reach up through each cylinder and mark the deck where the chamber wall lies around the outside of each valve. Off with the heads and out with the die grinder. You can make a ref mark in the cylinder to stay above if need be, but .250 down is a mile. Good Luck

Re: Best way to notch bores / chamfer cylinder bore tops? [Re: BradH] #590318 01/21/10 04:58 PM 01/21/10 04:58 PM
Joined: Jan 2003 Posts: 31,336 Oregon A AndyF I Win
AndyF I Win A Joined: Jan 2003 Posts: 31,336 Oregon	Maybe a carbide bit or a 38 grit sanding roll. The sanding roll works better for me but some guys are skilled with the carbide bit.

Re: Best way to notch bores / chamfer cylinder bore tops? [Re: Sport440] #590319 01/21/10 07:35 PM 01/21/10 07:35 PM
Joined: Jan 2004 Posts: 13,247 Mt. Vernon, Ohio dartman366 I Live Here
dartman366 I Live Here Joined: Jan 2004 Posts: 13,247 Mt. Vernon, Ohio	Quote: Using a steel shim I clearenced/relieved the head chamber at its tightest spot at the valves. I then marked the gasket at its relieve points and transfered that same clearence to the block using it as a Template for chamfering. To save Compression I didnt chamfer the exhaust as much, as I feel the intake side is the most benificial. I used a medium bit carbide grinder. The results before and after with the Intake valve set at .550 lift was very appearant as viewed from the bottom side of the clyinder. mike EDIT, Also it wasnt done for clearence. It was done for a smoother more open intake flow near its highest velocity flow path. At minumum, I think all the BB engines could see a improvement by at least breaking the Sharp bore edges at those points. getting ready to do my smallblock the very same way as you explained. Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.

Re: Best way to notch bores / chamfer cylinder bore tops? [Re: BradH] #590320 01/21/10 08:41 PM 01/21/10 08:41 PM
Joined: Feb 2005 Posts: 4,353 Prospect, PA BSB67 master
BSB67 master Joined: Feb 2005 Posts: 4,353 Prospect, PA	I used the head gasket as a template after I checked it against the head. Blued and scribed. Carbide burr and sanding rolls. I did it before the final machining. 5751306-DSCN6524.JPG (1419 downloads)

Re: Best way to notch bores / chamfer cylinder bore tops? [Re: BradH] #590321 01/21/10 08:52 PM 01/21/10 08:52 PM
Joined: Jul 2005 Posts: 8,647 ELYRIA,OH B blownzoom440
blownzoom440 B Joined: Jul 2005 Posts: 8,647 ELYRIA,OH	in victorylibrary.com in the tech page section there is a writeup/how to on this. http://victorylibrary.com/mopar/chamber-tech.htm Last edited by METAL STORM; 01/21/10 09:47 PM.

Re: Best way to notch bores / chamfer cylinder bore tops? [Re: blownzoom440] #590322 01/21/10 09:01 PM 01/21/10 09:01 PM
Joined: Jan 2003 Posts: 3,103 Phila Pa S scatpacktom master
scatpacktom master S Joined: Jan 2003 Posts: 3,103 Phila Pa	My stuff looks just like BSB67's stuff. Don't be scared, fire up the carbide

Re: Best way to notch bores / chamfer cylinder bore tops? [Re: scatpacktom] #590323 01/21/10 10:04 PM 01/21/10 10:04 PM
Joined: Aug 2003 Posts: 44,171 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 44,171 Bend,OR USA	Quote: My stuff looks just like BSB67's stuff. Don't be scared, fire up the carbide I would make sure I knew where the top ring travel ends before I started (and I do on motors that need chamfering) chamfering the cylinder walls, no sense in going to deep and hanging a ring up and breaking it or allowing all of the compression to blow by the top ring Measure three times, cut once Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Best way to notch bores / chamfer cylinder bore tops? [Re: Cab_Burge] #590324 01/21/10 10:09 PM 01/21/10 10:09 PM
Joined: Jan 2003 Posts: 3,103 Phila Pa S scatpacktom master
scatpacktom master S Joined: Jan 2003 Posts: 3,103 Phila Pa	I just go half way to the top ring and scribe a line.No big deal

Re: Best way to notch bores / chamfer cylinder bore tops? [Re: BradH] #590325 01/21/10 10:14 PM 01/21/10 10:14 PM
Joined: Jan 2003 Posts: 15,439 Val-haul-ass... eventually B BradH OP Taking time off to work on my car
BradH OP Taking time off to work on my car B Joined: Jan 2003 Posts: 15,439 Val-haul-ass... eventually	Thanks for all the replies. I'm interested in doing it for airflow reasons, too.

Re: Best way to notch bores / chamfer cylinder bore tops? [Re: BradH] #590326 01/22/10 03:03 PM 01/22/10 03:03 PM
Joined: Jan 2003 Posts: 2,929 Canada R RobR master
RobR master R Joined: Jan 2003 Posts: 2,929 Canada	Quote: The shop that did the machine work on my 448 block did a really crappy job chamfering the tops of the cylinder bores. Since I'm going to have to clean up their work, How bad could it be ??? post a picture or two..

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