Has anyone ever converted their 2-bolt L98 to a 4-bolt? Or, does anyone know if there is any info out there on the proper way to do it. I don't want to risk cracking my block or bearing caps.

 

Hello Michael.
You should probably go with the splayed 4 bolt conversion, as it'd be virtually the same price, but offer more strength.
Any reason for you to do this upgrade?

You do need a machine shop to do this. They will bolt in the new caps, drill and tap the holes, and line hone the block.

 

its a machine shop will do it and its not the cheapest thing but its not outrageous either...bottom line is u have to ask yourself do you need it? a 2bolt block with arp main studs can hold 400-450 hp no problem unless uare going to be making over about 500hp or more its a waste of money IMO.

 

The reason I'm inquiring, is because I just bought a used L98 from a guy. It came out of a 91 GTA, and the guy had some work done to it. He had the heads ported out, and installed roller-rockers along with a Comp 306 cam; 229/245, .510/.540

I want to throw a 383 stroker kit in it because the bottom end has about 120K miles on it. I just want to make sure that it will hold up.

 

A conventional straight-drilled 4 bolt block isn't significantly stronger than a 2 bolt block in any way that's going to make a difference.

You could machine it for splayed 4 bolt caps, but you don't need it.

 

yeah just have it built with good quality ARP fasteners. it will hold up fine. ure not gonna be making rediculous power with it the 2bolt will hold....