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353 Fastech N/A or Blowers

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353 Fastech N/A or Blowers

Old 08-13-2019, 12:01 PM
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Default 353 Fastech N/A or Blowers

Iím looking for some insight on which direction to go for upcoming off season. Currently have carb HP 500ís. Starboard motor was a complete rebuild 15hrs ago due to broken oil pick up tube. Portside has 75hrs on topend and 340hrs on bottom end. Thinking about pulling motors this winter to repaint bilge and freshen everything up. This is where I need some input.

Do I (A) build current motors for a benchmark of 600HP N/A
or (B) keep my motors as is and add blowers? If option (B) which blower setup? Weiand 177ís or B&M 250ís which I was told you canít get hard parts as they arenít made anymore.

Currently have installed MSD ignition, Holley electric fuel pumps, water crossovers and upgraded Holley carbs.
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Old 08-13-2019, 02:29 PM
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IMOP build fresh 600HP N/A motors...simple.....
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Old 08-13-2019, 04:40 PM
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Will be a fun boat with 600 per side!!!
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Old 08-14-2019, 05:27 AM
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Mine came with 525's and I put Whipples on it the second season I had it.

They made it an entirely different boat.

The only drawback at all has been the drives. I had to accept a rebuild every few years or lay out $35k for Imco's and be done. I went with rebuilding them.
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Old 08-14-2019, 06:12 AM
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Originally Posted by Apexwarrior View Post
Mine came with 525's and I put Whipples on it the second season I had it.

They made it an entirely different boat.

The only drawback at all has been the drives. I had to accept a rebuild every few years or lay out $35k for Imco's and be done. I went with rebuilding them.
My drives are going to be my weakest point. You already have an upgrade with having 525ís. So Iím assuming you have XR drives.
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Old 08-14-2019, 06:14 AM
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Yes - XR's.
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Old 08-14-2019, 07:40 AM
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Look into having your drives built at All American Drive Service. George knows every way to get the most out of a Bravo setup. Stage 4 is what I did behind 600SCIs with Stage 3 upgrade. http://www.allamericandriveservice.com/Hi-Performance.html
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Old 08-14-2019, 07:52 AM
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Originally Posted by VoodooRob View Post
Look into having your drives built at All American Drive Service. George knows every way to get the most out of a Bravo setup. Stage 4 is what I did behind 600SCIs with Stage 3 upgrade. http://www.allamericandriveservice.com/Hi-Performance.html

Thanks Voodoo, Iíll check him out
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Old 08-14-2019, 08:26 AM
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Go without blowers my 02?
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Old 08-14-2019, 08:37 AM
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If youíre concerned about drive longevity, then 600 NA is your friend.

600 NA isnít too hard to get, though youíll need to figure out top ends. 540s could get you there with the iron heads you have (assuming a mild 1.1 HP per cube). Change the rotating assembly, clean up the heads, and update the cam. Youíll probably get to your goal without much effort.

I want to do the same for my 311, though Iíll probably go one more season on the 502 MPIs. Iíll be watching your thread!
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