Author Topic: Cylinder notching for clearance.  (Read 2794 times)

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67428GT500

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Cylinder notching for clearance.
« on: July 06, 2019, 01:59:49 AM »
I am in need of pictures and how to on valve clearance notches for a 428. A direct over bore picture and how and what to use to do them. Location, or how to find the location best suited location and how deep in the cylinder edge.

                                                                        Thank you, Keith
« Last Edit: July 07, 2019, 12:20:54 AM by 67428GT500 »

67428GT500

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Re: Cylinder notching for clearance.
« Reply #1 on: July 10, 2019, 10:00:19 PM »
No one knows anything about cylinder notches for valve clearance?

338Raptor

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Re: Cylinder notching for clearance.
« Reply #2 on: July 11, 2019, 02:21:30 AM »
I’ve done it on a 460 based 557 cid motor with Kaase P51 heads. I haven’t tried it on an FE but I plan to do so on my next build. On my 557 I don’t know how it affected power but I know the motor makes 900 hp with untouched heads. I think it works well to unshroud the valve al low lift.   The valve passes the shrouded area twice, once while opening and again when closing.  The way I look at it, every little bit of added air flow is more power. And for very little effort.  If you can add few extra horsepower here and there enough times it eventually adds up to a noticeable difference. 
When I relieved the top of the cylinder bore I made damn sure not to grind down to the top piston ring at TDC and I didn’t grind back to the head gasket. I used Prussian Blue (I think they call it something else now) to mark my limits and I took my time not to grind outside my lines.  And I only ground on the area adjacent to the intake valve.
I don’t know how to post pics but I found some pics on the  internet I’ll try to post soon.
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67xr7cat

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Re: Cylinder notching for clearance.
« Reply #3 on: July 11, 2019, 09:56:16 AM »
Just mock it up with the head and mark the locations. That way know they are where need to be in relation to the valve.

gt350hr

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Re: Cylinder notching for clearance.
« Reply #4 on: July 11, 2019, 10:38:24 AM »
  Keith ,
      Normally only needed with a MR head and it's spread valve location , or a canted valve engine.  I set the head on with checking springs and push the valve down to see if it hits first. If it does , I use layout dye to mark the upper half of the bore and set the head on again , push the valves down to make a mark on the layout dye . As 338Raptor mentioned , you can't cut deeper than the depth of the top ring on the piston and no wider than the head gasket will allow.
    Randy

cammerfe

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Re: Cylinder notching for clearance.
« Reply #5 on: July 11, 2019, 02:11:22 PM »
I'll only add that the tool of choice, after marking boundaries carefully, seems to be a sanding drum chucked in a 'pistol' drill motor.

KS

67428GT500

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Re: Cylinder notching for clearance.
« Reply #6 on: July 11, 2019, 05:30:50 PM »
Hello:
I am going to be setting up with my new Edelbrocks. I had the 2.19 1.75 valves installed.  The spacing and angle is different so I know they'll c;ear the 4.155. However, Keith Black mentioned he runs the same with the Edelbrocks but notches the block to unshroud the valve. I was't sure how to determine location. The entire process. Obviously not from the deck. I presume I'll need to install the head and mark the inside of the cylinder wall?
                                                                                                                        -Keith

C8OZ

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Re: Cylinder notching for clearance.
« Reply #7 on: July 11, 2019, 06:16:25 PM »
Off-brand photo, but here's what's being suggested. Then use the marking device of your choice. I'm a blue sharpie guy.

https://www.thirdgen.org/forums/attachments/tech-general-engine/426196d1501495188-trick-flow-175cc-heads-s7305468.jpg

gt350hr

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Re: Cylinder notching for clearance.
« Reply #8 on: July 12, 2019, 10:28:27 AM »
   That C8OZ supplied photo looks like a 400 Pontiac where the bore notching was standard on some blocks.
   Keith , Barry or Brent certainly could tell you if you need to notch. They both have done that block/head combination many times.
   Randy

67428GT500

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Re: Cylinder notching for clearance.
« Reply #9 on: July 12, 2019, 03:11:59 PM »
Randy:
I know Brent is dealing with his back and Barry hasn't been around on either forum much.  I was hoping someone would post a picture of the deck on a notched 427 block. It would be helpful. The machinist ripped my '64 427 block off when he closed his doors.  I don't remember any bore notches on the low riser.
Anyway, the only one that really replied was Keith Black who said he notched his block. I know the Edelbrock heads changed the valve geometry to avoid the issues with the MR heads on anything but a 427 block. I think they'll clear without notching, but I think the valves wind up shrouded without doing the work.
Thanks for replying. I am praying all goes well with the cam re-seat.

                                                                                             Kindest Regards,
                                                                                                                    -Keith

C8OZ

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Re: Cylinder notching for clearance.
« Reply #10 on: July 12, 2019, 04:06:25 PM »
I'm sure you found this photo when you Googled, but here's one Barry did on a 4.35 bore Genesis for (modified) Blue Thunder heads.

https://st.hotrod.com/uploads/sites/21/2010/07/1007phr_16_o-ford_fe_engine-bores.jpg


Warmest wishes.
« Last Edit: July 12, 2019, 04:12:10 PM by C8OZ »

67428GT500

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Re: Cylinder notching for clearance.
« Reply #11 on: July 13, 2019, 12:37:33 AM »
Thank you for the link. I understand what it does. I really don't know how to determine location in particular. If someone has a 427 block and could take a picture of the deck that was clear It would give me an idea of a starting point.
                                                                                 -Keith

thatdarncat

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Re: Cylinder notching for clearance.
« Reply #12 on: July 13, 2019, 05:46:46 PM »
Here are pictures of my ‘64 427 Center Oiler. Bore is .030 over. The notches were on the block when I got it, just on the intake sides. My 427 Side Oiler service block is similar, but it’s at the machine shop at the moment, so I can’t take pictures of that one.



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