I got a 2-bolt main LT1

I want to make it 4-bolt for my 396 buildup.

The block is already at the shop. What do I need to make it a 4-bolt?

Thanks

 

4 bolt caps, and some machine work.

 

Tell the machine shop "I want 4-bolt mains", specify OEM iron 4-bolt caps or aftermarket steel caps. It's not a DIY job and not cheap either.

Rich

 

get a block from a corvette

 

And hel'l end up with 4 bolt straight, which is in many cases weaker than 2 bolt mains. A 2 bolt main block converted to 4 bolt splayed with a stronger aftermarket cap is a better choice.

 

i was going to do splayed mains on my two bolt 383 my machinist said he had seen some blocks spider web do to the stress of splayed mains he suggested two bolt studs holding together so far

 

Depends...how much RPM are you going to be spinning at...if its turning over 6500rpm, the go 4 bolt...but the 2 bolt will hold. Its not the power that screws the bottom end...its how fast you turn it that causes it to go out.

 

Splayed 4-bolt is the only way to go IMO...

 

The LT1 block is not a gen1 block and was designed with 4 bolts in mind, a good shop might have noticed or known that. That said the stock 2 bolt can hold a lot stud it and it will hold even more, the next logical step is the splayed 4 bolt with aftermarket caps, no sense in paying a premium for the Vette block, when that money could be put instead towards the better aftermarket setup, especially if you are genuinely going to need such a mod.

 

True story.