Results 1 to 9 of 9

Thread: Technical BBC Question

  1. #1
    Hotcrusader76
    What size bolt threads into the crankshaft snout on a BBC?
    Ya know the one that secures the harmonic dampner to the crank? Is it a 1/2-20?
    Please advise...

  2. #2
    Senior Member
    Join Date
    Jun 2009
    Posts
    10,871
    yes it is , and we've got a bitchin ARP 12 point 190,000 psi bolt for it too.

  3. #3
    Hotcrusader76
    Rexone:
    yes it is , and we've got a bitchin ARP 12 point 190,000 psi bolt for it too. Guess I need to have Jay add yet another misc part...
    This freakin motor is killing me....stripped crank snout (new helicoil), three stripped head bolt threads (three new helicoils)...what gives!
    If I new this was going to happen, I would have opted for another block. But no worries....I must press on.

  4. #4
    Senior Member
    Join Date
    Jun 2009
    Posts
    10,871
    GM blocks are notorious for stripped head bolt threads. It is because they are tapped through into the water jackets and the ends of the stock head bolts rust because they stick through. Then when removed, they bring half the thread material out with them. Age old problem. And you don't find it till you go to bolt the heads back on. Studs are one fix. Crank stripping is not as common to my knowledge but very fixable with the helicoil.
    That's why I like Merlins. They are blind hole in the block (and more thread). Good luck with it Ty.

  5. #5
    Blown 472
    Rexone:
    GM blocks are notorious for stripped head bolt threads. It is because they are tapped through into the water jackets and the ends of the stock head bolts rust because they stick through. Then when removed, they bring half the thread material out with them. Age old problem. And you don't find it till you go to bolt the heads back on. Studs are one fix. Crank stripping is not as common to my knowledge but very fixable with the helicoil.
    That's why I like Merlins. They are blind hole in the block (and more thread). Good luck with it Ty. Hummmm, fords dont go into the water and they are counter bored so when you deck the block you dont get into the threads, some good stuff you have there.

  6. #6
    Hotcrusader76
    Rexone:
    And you don't find it till you go to bolt the heads back on. .
    No sh*t! I had to pull the left head three times already because of the threads snapping...
    I have gone to bed at night having nightmares about the head tightening sequence

  7. #7
    058
    GM makes engines?

  8. #8
    Senior Member
    Join Date
    Jun 2009
    Posts
    10,871
    058:
    GM makes engines? Yeah they just screwed the head bolt deal up.
    Ford made the head bolts right but screwed the rest the engine up. Go figure.

  9. #9
    Blown 472
    Rexone:
    058:
    GM makes engines? Yeah they just screwed the head bolt deal up.
    Ford made the head bolts right but screwed the rest the engine up. Go figure. For the sake of debate, the only thing wrong with the fords is the exhaust port, throw a set of blue thunders with the oh so great chivvy exhaust port and whaa laa chivvy killer.

Similar Threads

  1. Technical question...
    By HM in forum V-Drives
    Replies: 2
    Last Post: 09-12-2006, 02:42 PM
  2. Technical Question
    By Mid-life Crisis in forum V-Drives
    Replies: 10
    Last Post: 05-17-2005, 11:10 AM
  3. A technical question for the Hotties
    By HEDJUG in forum Sandbar
    Replies: 28
    Last Post: 01-12-2005, 09:53 PM
  4. V drive technical oil pan question
    By Fiat48 in forum V-Drives
    Replies: 18
    Last Post: 09-17-2004, 05:31 PM
  5. Technical Question
    By Her454 in forum Sandbar
    Replies: 13
    Last Post: 11-07-2003, 02:06 PM

Posting Permissions

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