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5.7 TBI build questions

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Old 10-04-2017, 12:14 PM
  #11
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His issue is more of the TBI and intake vs the MEFI 1. The MEFI 1 is perfectly capable of what he's trying to do and would be the most cost effective should he decide to tune it himself.
Correct. It is a 2bbl. GM throttle body/intake with two measly injectors. Definite choke point. The only difference between a 260 HP 5.7L EFI and the 300 HP 350 MAG in the late 90's was the intake and TBI vs. MPI setup. Heads, cam, and shortblock were identical.
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Old 10-04-2017, 02:14 PM
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His issue is more of the TBI and intake vs the MEFI 1. The MEFI 1 is perfectly capable of what he's trying to do and would be the most cost effective should he decide to tune it himself.
Like I said out dated fuel delivery system. and at 220 hp this would NOT be a roller small block. They Merc 1997 had a carb version of this exact engine at 210 hp what a dog non Vortec non roller motor. Now if one would happen to have the 260 hp then that is a Vortec / roller small block.

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Old 10-04-2017, 02:25 PM
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And I thought I would mention the tbi's were all 2 injectors for black side Merc even in late 2001

.http://www.marineengine.com/parts/me.../throttle-body

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Old 10-04-2017, 02:26 PM
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Just in case one misses it in the parts listing the non rollers made 210 carb and tbi made 220 hp

MerCruiser 5.7L EFI (2 Barrel.-TBI) GM 350 V-8 1997 Cylinder Block & Camshaft (Flat Lifters) Parts

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Old 10-09-2017, 10:22 PM
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Volvo Penta marketed a 5.7 Votec TBI engine in the late 90's that was rated at 320 HP. It used an aluminum 4 bbl intake with an adapter for the 2bbl tbi. It was the exact same GM long block as Merc used.
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