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  1. #1

    Question Small Block performance upgrade suggestions

    My engine compartment will only fit 2 small blocks. I presently have 2 newer 350 Magnum EFI Mulptiport engines.

    Please suggest horsepower upgrades.

    Thank you very much. RB

  2. #2
    bobby daniels
    It depends on how much money you want to spend (cubic dollars)
    you can put a blower on which is the best but most money or you can stroke it to a 406 or 383 and make a very good motor
    there is ton we can do ,,give me the amount ,,,wecome to the board

  3. #3
    Would $4,000 to $6,000 do anything?

  4. #4
    bobby daniels
    both motors alittle ,,each motor alot,,,,, thats worth the money I should say

  5. #5
    How about $3,000 per engine?
    I am considering Stainless Marine manifolds and risers as a start. Any thoughts?

    The engines are out of the boat, therefore now may be an ideal time to make some upgrades.

  6. #6
    Also...Any thoughts on "lab finishing" the props?

  7. #7
    bobby daniels
    yes that may help a few MPH , I would add a stroker crank and pistons,and port the heads and go to like 9 to one compression and change cams with the stainless exhaust and that would make a potent package for alittle more than you were talking

    To start with port the heads and angle cut them to get 9 to 1 comp. add you exhaust and a cam and reprogram the ecu and that will be a good start

  8. #8
    Thank you for your thoughts.

    Would it be better to trade for Scorpions (340 hp)? My 350 MPI EFIs are newer. I think I can get them on a trade plus $6,000.

  9. #9
    VIP Member Platinum Member wwwTOPDJcom's Avatar
    My Boats:
    1992 450hp Senza Spectre 25'
    Join Date
    Mar 2002
    Vestal/Binghamton NY
    what about this 92 350mag pretty stock I just put
    K&N filter, K&N snubstack , EMI thunders, and Corsa Q & Q
    thur hull. this is in a 25 foot 3800lb dry single step boat
    How much to get a reliable 400hp
    Attached Images Attached Images

  10. #10
    Registered klmken's Avatar
    My Boats:
    1986 Sea Ray Pachanga 22
    Join Date
    Jun 2001
    Alexandria, VA
    If your motors don't have them already, upgrade to the vortec heads. Looks as though they will flow nearly 400 hp without a lot of work. Not sure how much as you are limited in cam choices with the wet exhaust. i'll dig up the article as soon as i can.

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