TKerr
OBS Enthusiast
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:
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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