509 build for "Thunder"

[TKerr]

This thread could probably also fall in the engine performance and computer swap thread as well. That being said, I am finally starting on building the 509 for my ********* beast "Thunder". I will try to update this thread on a regular basis as build and time allows. I will attach pictures as the build progresses. Here is the low down on the engine and the goals.

Acquired a Mercruiser 502 out of a boat with a steel forged rotating assembly. Engine has been bored .30 over making it a 509. The heads are 454 rectangular port heads. I will be staying fuel injected. Found a Mercruiser 525 EFI system and will be swapping in a 0411 computer and using either HP or EFI live to tune it (decision not made). Once engine is done I will build the 4l80e transmission to handle the horsepower.

Rotating assembly has been balanced:

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[TKerr]

Cam and pistons:

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[TKerr]

Heads, roller rockers, other parts:

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[TKerr]

The intake and injection system to be used is a Mercruiser 525EFI. Injectors will be replaced with 80lb injectors.

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[TKerr]

Teardown and removal of the 454 has begun:

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[TKerr]

Tear down under way.

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[TKerr]

Having a valve train tray is extremely important. Even though I am not use my old components on the 509 I still plan on rebuilding this engine later, and a good valve tray is a must in my opinion.

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[TKerr]

509 is assembled

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[TKerr]

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[TKerr]

Like any build I have exceeded my build budget already. If I would have stayed with the flat top pistons, smaller cam, and used some of my reusable parts (valve train components, balancer, etc) I could have saved quite a bit. But I think it will be well worth it. I am still extremely cheaper than buying a similar crate engine.