With the 550s do a walbro and the 12 volt mod
Grey or yellow plug ecu...car year you own?
Yes remove a main cap and rod caps to inspect
Mhg or comp headgasket?
No tranny controller
Swap to r154 w58 aren't known for strength
Abs has its own controller
I'm just breaking you balls. I personally believe there harder. Tigher tolerances, aluminum and iron expand diff, there a lot of differances but if you take your time an engine is an engine you just have to build it right
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