Welcome to V8Buick.com.
Results 1 to 9 of 9

Thread: Piston notching

  1. #1
    Join Date
    Feb 2008
    Location
    So Cal
    Posts
    117

    Default Piston notching

    I had my blocked decked by using the chamber cc#s for the heads out of the catalog and when I received the heads and measured them I needed to notch the pistons in order to achieve the optimal piston to valve clearance.
    My question is, can you over notch the piston. Yes, I realize you can blow through the piston.
    I think I'm just nervous because I usually don't trust catalogs and I've never had to notch pistons before.

  2. #2
    Join Date
    Feb 2002
    Location
    Wadsworth,OH
    Posts
    5,848

    Default Re: Piston notching

    What are your clearances now? I've been told that generally as long as you have .100 or more, you're good.

    If you don't know, it would be a good idea to find out. Just use the old modeling clay on the piston method and a good digital micrometer.
    Phillip Sedlon
    Wadswoth,OH
    1970 GS convertible, 462/200-4R, (4250 lbs with me), 11.86 at 112 mph, 1.59 60'
    1978 Chevy Z28, 350/4-speed, no where near as fast.........yet!

  3. #3
    Join Date
    Aug 2002
    Location
    Huntsville
    Posts
    2,210

    Default Re: Piston notching

    I would think the piston top should not be less than 0.125" thick at any point.
    Scott

  4. #4
    Join Date
    Feb 2008
    Location
    So Cal
    Posts
    117

    Default Re: Piston notching

    I did measure before I started and it was under .100. By the time I cut through all of them to make them equal I ended up with .130. One opinion I received is that it's good insurance encase of a mis shift.

    Just to confirm, when you say .125 that's going to be on the piston brow?

  5. #5
    Join Date
    Dec 2003
    Posts
    2,606

    Default Re: Piston notching

    The notches on these Speed Pros are .250 measured from the brow to the flat on the top. A little deep for my liking if you look at the 3rd pic. and real close to the edge in the 2nd. There not too much material there but they did work. I don't think you will have a problem. I notched pistons a few times by hand. I went with .080 in., .100 ex. and .050 for the side. Never had a problem.
    Ray
    Attached Images Attached Images

  6. #6
    Join Date
    Feb 2008
    Location
    So Cal
    Posts
    117

    Default Re: Piston notching

    The pics are a big help. I think I can sleep better tonight. I tried to upload the pics of mine but I can't seem to get them to fit in the file size required by the website. Any ideas?

  7. #7
    No Lift is offline Platinum Level Contributor
    Join Date
    Feb 2005
    Location
    Central PA
    Posts
    1,715

    Default Re: Piston notching

    I've used the Isky notch cutters and they work great while the pistons are in the block. I think the biggest interference place is along the rim area and then some in the dish. My notches look about the same but shallower.
    Looking at the pictures I've never had to notch the Speed Pro pistons that deep for any cam I've used that works ok with the compression that they will give(10:1). Because of this you never have to worry about weakening the piston.
    Mike Pesarchick
    BPG #1572
    NE GSGN #29
    GSCA #8
    USFRA "130 MPH Club" member

  8. #8
    Join Date
    Sep 2004
    Location
    Michigan, USA
    Posts
    14,883

    Default Re: Piston notching

    Make sure you don't confuse notch depth with crown thickness.

    After decking my old 430 to zero, I had to deepen the piston notches too, and had the same questions - how far can you go? I stopped at 0.120" thick (forged pistons) and did not have a problem with the notches, although detonation ruined the engine othrwise.

    I grabbed this off the shelf...

    http://home.comcast.net/~shinzan/pistonthickness.jpg

    Devon
    Fuel & Brake Systems Engineer
    "I can live with doubt and uncertainty and not knowing. I think it's much more interesting to live not knowing than to have answers which might be wrong." - Feynman
    "Good data is precious. The problem I have is when some damned fool fails to use it properly." - Slingerland

  9. #9
    Join Date
    Feb 2008
    Location
    So Cal
    Posts
    117

    Default Re: Piston notching

    All the input has been great. I finished notching today and they all look great. Just can't figure out how to decrease the photo size so I can attach some pics of the finished product.

    After all the help everyone has given me it's time for me to give back. Isky told me they were no longer making cutters and the stock they had was limited, but they gave me the name of a company that did come through for me.

    What ever you need they can make.

    Lindy Tool Co.
    1117 Greenwood Ave.
    Waukegan, ILL.
    60087
    1-800-823-cuts
    http://www.lindytools.com/

 

 

Similar Threads

  1. 0.096" offset on stock 350 con rod
    By sean Buick 76 in forum Small Block Tech
    Replies: 7
    Last Post: 02-15-2014, 09:15 PM
  2. question about buick 455 .30 piston dish size CC
    By 72gsBuick in forum Street/strip 400/430/455
    Replies: 4
    Last Post: 06-05-2008, 11:45 PM
  3. Piston Dimensions and Compression Help
    By Herk in forum Small Block Tech
    Replies: 1
    Last Post: 12-10-2007, 02:52 PM
  4. Camshaft theory explained/demystified/simplified/...
    By BuickStreet in forum The Bench
    Replies: 4
    Last Post: 09-13-2003, 05:33 PM
  5. 350 Forged Piston Question
    By GSXMEN in forum Small Block Tech
    Replies: 13
    Last Post: 02-16-2002, 03:17 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Back to top