Building a sts turbo'd 383 and have stumbled on a issue well one of many. I am trying to figure out what bottom end to use but do i need to splay the main caps or can i use a main cap girdle. The company i work for sells the girdles so i wasn't sure. I haven't seen many people use them on the lt1's.
My plans with the car is high rpm road racing, so i need to make sure it stays together.

Thanks guys
I'm having TPIS in Minnesota do the machine work and I will be doing the assembly. I will be using AI heads or something else i haven't decided yet.

 

i am not a big fan of girdles.
as for splayed mains it depends on how high your going to spin it and how much power you want to make.

 

Main girdles in SBCs are pretty worthless. Flat splayed caps are the way to go.

 

well I spin it at 6900 right now at the strip but I think I will be in the same area with the 383. I would like 600-750 hp. I kind of figured the spayed caps would be best bust wasn't sure.
I'm going to have a lot of money in it this time and I am tired of blowing up my motor, so i want to build it once the right way.

 

I would say that of all of the FI builds that I have read about on here, they were splayed caps, the occasional 4 bolt block, or a few guys who just left it a factory 2 bolt, and I don't know of anyone using the main girdle. So I don't know if they work or not to stabilize the caps. I used Pro Gram caps on my engine and was never sorry that I spent the extra money to build it strong.