The lt4 block comes with parallel 4 bolts and u can get a set machinced called 'splayed'

whats the diffrence?

what are the advantages of both?

 

On SBCs the 3 center caps are where the 4 bolt caps are, the outer 2 bolts on each cap will either be parallel to the center bolts on the same cap, or angled with the heads toward the center bolts .

Here is a picture of a played cap.

http://www.hotrod.com/techarticles/42580/#

 

yeah if u have a 4 bolt block u cant do splayed caps u will need a 2 bolt block and drill for the splayed caps. splayed caps go in at an angle some are diff mine were 12.5 degree angle. splayed caps are stronger than the 4 bolt. i did the splayed cap on my motor im building and filled the block half way so it shoudl be pretty strong.

 

There's been some discussion about straight vs splayed. On stock LTx blocks, it's usually better to go straight in with all 4 bolts since the bulk heads are thicker there than angled towards the outer wall of the block. Bret and others agree on this. But splayed caps might actually be better on stronger aftermarket blocks since they're more rigid and have more meat in those areas.