This engine is supplied with a 4 bolt main block and your choice of a one or two piece rear main seal, depending on your application.
This part number is recommended for street use and premium pump gas with a compression ratio of approximately 9.5:1 (with 64cc combustion chamber cylinder heads).
Tri Star Performance lets you customize your engine build to what you really want. Start by telling us if you want a one or two piece rear main seal to make it match what's in your vehicle. Next, look through the variety of options offered for each high performance crate engine. Add what you want to make it your own.