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11-26-2014, 04:20 PM #1
8000 RPM
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Mercury Pro XB-250 cylinder heads...
What is the difference between the XB250 heads vs the stock 3.0L 225/250 heads?
J-Town Hot Boat Team
Barracuda 188CCR/Suzuki 140
Past Boats:
Checkmate 2800SX/Twin Merc 250’s
Checkmate Pulsare 2400/Verado 300
Checkmate Starflite/Merc Pro XB250
Canadian Edition Hydrostream AE-21/Merc 2.5
Checkmate Pulsare 2100/Merc 225Xri
Hydrostream Valero YT Bowrider/Merc 175
Talon T-21/Mercury Racing 2.5 Carb
Sleekcraft ModVP Bowrider/Evinrude 225 Vindicator
Velocity 230/Mercury 454 Magnum
Scout 172 Sportfish/Yamaha 130
SeaRay F16 Jet boat/Mercury SportJet
SeaRay 17' Seville/Merc I/O
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11-26-2014, 09:15 PM #2
6000 RPM
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It depends on the years but a few cc's less
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11-27-2014, 08:33 AM #3
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Biggest difference is the block and porting.
"We, the unwilling, led by the unknowing, are doing the impossible for the ungrateful. We have done so much, for so long, with so little, we are now qualified to do anything with nothing."
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11-28-2014, 12:13 PM #4
8000 RPM
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Can the stock 225/250 heads be interchanged with the Pro XB 250??
J-Town Hot Boat Team
Barracuda 188CCR/Suzuki 140
Past Boats:
Checkmate 2800SX/Twin Merc 250’s
Checkmate Pulsare 2400/Verado 300
Checkmate Starflite/Merc Pro XB250
Canadian Edition Hydrostream AE-21/Merc 2.5
Checkmate Pulsare 2100/Merc 225Xri
Hydrostream Valero YT Bowrider/Merc 175
Talon T-21/Mercury Racing 2.5 Carb
Sleekcraft ModVP Bowrider/Evinrude 225 Vindicator
Velocity 230/Mercury 454 Magnum
Scout 172 Sportfish/Yamaha 130
SeaRay F16 Jet boat/Mercury SportJet
SeaRay 17' Seville/Merc I/O
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11-28-2014, 12:37 PM #5
Screaming And Flying!
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You will loose about 10psi if I remember correctly
Quartershot T-3R 15" 3.5L E-Tec 1.62 Sportmaster
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11-28-2014, 12:46 PM #6
6000 RPM
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Early style 225/250/300pm is real close in Port timing. If you put 250xB heads on a stock 225/250 you will gain a little compression. The main difference between the 250 xb and all the rest of the older efi blocks is they removed the compression relief slot (cat eye).
What you should really be looking for is a set of c10 300pm heads. They would end up putting you in the 130 lb range.
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