Welcome to Club Hot Rod!  The premier site for everything to do with Hot Rod, Customs, Low Riders, Rat Rods, and more. 

  •  » Members from all over the US and the world!
  •  » Help from all over the world for your questions
  •  » Build logs for you and all members
  •  » Blogs
  •  » Image Gallery
  •  » Many thousands of members and hundreds of thousands of posts! 

YES! I want to register an account for free right now!  p.s.: For registered members this ad will NOT show

 

Thread: BBC pushrod guide question.
          
   
   

Reply To Thread
Results 1 to 6 of 6
  1. #1
    jimmyjeep is offline CHR Member Visit my Photo Gallery
    Join Date
    Nov 2006
    Location
    west olive
    Car Year, Make, Model: 1997 S-10 357c.i.
    Posts
    225

    BBC pushrod guide question.

     



    Pop has a set of 802 heads for a 402 chevy. The push rod guides that came on the heads are 5/16" wide in the slot opening for the pushrods. He just bought 3/8" pushrods for the engine. Shouldnt that call for a 7/16" slot opening? What would that small of a guide have been OE for? Thanks
    "oohh...thats gonna leave a mark!"

    1997 s-10, 357 C.I., 350 turbo, speedpro 11:1,Comp Cam custom grind mech. roller, Canfield heads, 1.6 roller rockers, edelbrock tm-1, holley 750sp, Hooker Headers, MSD, 3K B&M stall, 4:11 gears

  2. #2
    erik erikson's Avatar
    erik erikson is offline CHR Member Visit my Photo Gallery
    Join Date
    Aug 2004
    Location
    clive
    Car Year, Make, Model: BLOWN 540 57 CHEVY
    Posts
    2,878

    Quote Originally Posted by jimmyjeep
    Pop has a set of 802 heads for a 402 chevy. The push rod guides that came on the heads are 5/16" wide in the slot opening for the pushrods. He just bought 3/8" pushrods for the engine. Shouldnt that call for a 7/16" slot opening? What would that small of a guide have been OE for? Thanks
    Yes.O.E.
    Make sure always to use push-rods that are hardend for use with guide plates.

  3. #3
    jimmyjeep is offline CHR Member Visit my Photo Gallery
    Join Date
    Nov 2006
    Location
    west olive
    Car Year, Make, Model: 1997 S-10 357c.i.
    Posts
    225

    Eric, thanks. To clear this up though for me , (I can be a little dense), the 5/16 is O.E.? The 3/8 " is aftermarket size for performance? and we would need a 7/16" slot opening to clear the 3/8" pushrod width? Thanks again.
    "oohh...thats gonna leave a mark!"

    1997 s-10, 357 C.I., 350 turbo, speedpro 11:1,Comp Cam custom grind mech. roller, Canfield heads, 1.6 roller rockers, edelbrock tm-1, holley 750sp, Hooker Headers, MSD, 3K B&M stall, 4:11 gears

  4. #4
    pat mccarthy's Avatar
    pat mccarthy is offline CHR Member/Contributor Visit my Photo Gallery
    Join Date
    Apr 2005
    Location
    bay city
    Posts
    10,546

    no oem is 5/16 3/8 and 7/16 gm made all of them the 3/8 and 7/16 were used in more of the hp engines .pushrod all big blocks have guilds so they are hard push rods the size for the 3/8 pushrods are 3/8 push rod guilds and 7/16 push rods for 7/16 the guild can not let the push rod move a round that would defeat the push rod guild plate
    Last edited by pat mccarthy; 02-16-2008 at 08:25 PM.
    Irish Diplomacy ..the ability to tell someone to go to Hell ,,So that they will look forward to to the trip

  5. #5
    jimmyjeep is offline CHR Member Visit my Photo Gallery
    Join Date
    Nov 2006
    Location
    west olive
    Car Year, Make, Model: 1997 S-10 357c.i.
    Posts
    225

    Thanks Pat.
    "oohh...thats gonna leave a mark!"

    1997 s-10, 357 C.I., 350 turbo, speedpro 11:1,Comp Cam custom grind mech. roller, Canfield heads, 1.6 roller rockers, edelbrock tm-1, holley 750sp, Hooker Headers, MSD, 3K B&M stall, 4:11 gears

  6. #6
    pat mccarthy's Avatar
    pat mccarthy is offline CHR Member/Contributor Visit my Photo Gallery
    Join Date
    Apr 2005
    Location
    bay city
    Posts
    10,546

    yep ok most all the bbc i use the 3/8 pushrods the guild plates can be had from many comp /gm/manley but mark 5/6 are not the same they have a 3/8 bottom stud or tower bolt and are thinner to so if your working on one of them you need to look at this .i drill and tap them for old mark4 studs 7/16 top and bottom s and use the old mark 4 guild plates
    Irish Diplomacy ..the ability to tell someone to go to Hell ,,So that they will look forward to to the trip

Reply To Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
Links monetized by VigLink