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DB52,
The cost of porting the heads would be about $1,300.00 but this includes a valve job, setting up the spring heights, surfacing the heads on both the deck and intake sides, flow bench porting and seals. The springs are extra as everyone uses a different cam and the springs need to match the cam, and theres not one spring fits all. Also allow 3-5 weeks to get them done, depending on how busy I am at the time. PM me if you need more info.