4-bolt 400 block strong enough?
Race Director
Joined: Dec 1999
Posts: 16,945
Likes: 9
Re: 4-bolt 400 block strong enough? (Tominator)
smaller bore doesn't necessary mean more iron, the 350 has non siamesed cylinder walls, whereas the 400 has siamesed ones in the center.
As for the 4 bolt being weaker, yes that's because the outer bolt is drilled in an already thin section of the main webbing. A splayed 4 bolt from a 2 bolt would be the best option.
I see the term "splayed 4 bolt from a 2 bolt" advertised, but don't fully under stand it, can any one give a more indepth descriptions?
As for the 4 bolt being weaker, yes that's because the outer bolt is drilled in an already thin section of the main webbing. A splayed 4 bolt from a 2 bolt would be the best option.
I see the term "splayed 4 bolt from a 2 bolt" advertised, but don't fully under stand it, can any one give a more indepth descriptions?
[Modified by Twin_Turbo, 5:23 AM 7/2/2003]
Instructor
Joined: Apr 2002
Posts: 229
Likes: 3
From: Highland MI
Re: 4-bolt 400 block strong enough? (Twin_Turbo)
Here at GM Racing, we splay our Sportsman blocks at 20 deg and our racing blocks at 17 deg. GM Racing does not use production castings. We tooled up our own block to meet our needs.
One of the biggest draw backs to using an old 400 block is that they had a tendency to have core shift. I would recommend sonic testing the block before you invested any money into it.
One of the biggest draw backs to using an old 400 block is that they had a tendency to have core shift. I would recommend sonic testing the block before you invested any money into it.
