Need some help on assembling parts to build a 408 with LS3 heads.

What size head gasket do I need for this setup?
What is the part number for a GM intake for these heads?
Will my truck injectors work with an LS3 style intake?
What fuel rails should I use?

Are there any other parts that I need to get?

 

Head gaskets all depend on the target compression ratio and quench you are shooting for. They are a pretty vital part of the equation if you ask me. You will need to know how much the piston is above the deck to properly set up your quench distance. As far as the intake, you can run the L92 truck intake or the LS3 car intake. It takes a bunch of mods to get the LS3 intake to fit with your truck accessories so you might just want to stick with the truck intake. You can use the stock L92 fuel rail depending on your particular set up and goals. You need 8 offset rocker arms and the LS3 style rocker stands.

 

Rocker arms I got. Forgot about the rocker stands! Thanks.

Anyone know the part number for the L92 intake manifold?

 

As stated, this will need to be thought out and planned before we can answer your questions with any kind of certainty. If you know what kind of compression you want to run we can suggest a head gasket etc.. The chamber size on the LS3 heads are pretty big so I'd plan to either pick out a piston with a slight dome or mill the heads to decrease the combustion chamber volume.

What are your plans with the engine? Staying N/A or possible turbo,,, nitrous maybe? All these will play a factor in what components you choose.

Mike

 

The engine will be N/A for now. Remote (very) possibility of mild boost in the future. No nitrous. Street driven. Plan on using Wiseco -3cc flat top pistons.