Industrial Injection Stock New Heads 04.5-05 GM 6.6L Duramax LLY BUL-30420 Pre-set check valve at 18psi

Pre-set check valve at 18psi

Ports for electric fuel heaters and fuel pressure gauges ensure optimal performance even in extreme cold weather

Pick whether you have a speaker you need to take care of or not to get the correct fit

it's just not as stable as it needs to be

rattle free

Industrial Injection Stock New Heads 04.5-05 GM 6.6L Duramax LLY BUL-30420 Pre-set check valve at 18psiAre you rebuilding or just looking to increase your Duramax's strength? If you are planning on upgrading the power your engine puts out it's a good idea to increase durability and eliminate cracking. Industrial Injection's New Heads for the Duramax LLY are a great place to start because these brand new GM OE cylinder heads have a reinforced casting to make them more durable and help eliminate cracking. Each head has been pressure tested and comes