If I have a sohc stealth an I want to convert it into dohc, what do i need to change, apart than the heads, do i need to change the engine block? the wireing? computer? If someone really knows tell me please because i live in mexico and i think i am the only crazy that has 2 stealths

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You will need to change the block, heads, exhaust manifolds, ecu and I would suspect the wiring harness as well.