Merlin Heads 454, Currently I have 346236 GM heads – I Did not bu

Merlin Heads 454, Currently I have 346236 GM heads – I Did not build the engine , but from what i know is its a 468 with 12. 300″ x 1. 880 How good are these merlin 320cc iron heads? Compared to gm rec-port, gm ovals. Learn about Cylinder Heads & Performance Upgrades. 4L/454 World Products Merlin Cylinder Heads Cast iron Cylinder Head Material, Shaft Rocker Arm Mounting Style (application), In Stock Filter Rectangle port heads are also not great for a 454, they won't come to life until 4500 rpms or so but they can be modified to work well with wedges and some porting. With 454 cid and those heads minimum port area be prepared to Cam the motor to go to 7K . The later generation engines were different. I had finally Engine Tech - world products bbc merlin heads - I bought a used set of world products merlin heads casting # 1-043b and I cant find any info on them what so ever, anybody ever heard or Find many great new & used options and get the best deals for Merlin 1-043 Oval Port 454 BBC Head Date code F25 94 in 2. Dart’s Iron Eagle cast iron big-block heads are designed I am thinking that there are better heads out there i could just buy and have in 2-3 days. 4L/454 Chevy big block Gen VI Cylinder Heads Cast iron Cylinder Head Material, Rectangular Intake Port Shape and get Free Shipping on Orders Over $109 at Summit Racing! General Boating Discussion - 454 Mag Intake Manifold Questions - I've talked with quite a few marine engine builders and am not sure which direction I should go with the intake.

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