Re: [omc-boats] Small Block Chevy V8's

Bingo. That's exactly what I was trying to explain. With that procedure you shold be good to go. Also, be sure and change the UPPER final drive gears, as the V8 needs longer legs. Drive ratios are listed here: http://hhscott.com/evinrude/props.htm

Most 307's had the 21.16 upper gears. The later Ford 302 V8's (170, 175, 190 hp) had slightly shorter ratios.

  ----- Original Message -----
  From: David
  To: omc-boats@...
  Sent: Wednesday, May 17, 2006 4:36 PM
  Subject: Re: [omc-boats] Small Block Chevy V8's

  Thanks Lee,
  I have three sets of the wide stance motor mounts - one set from the V8 and two from other boats with V6's that I scrapped - and all are the same - so my plan was to simply mount the V8 on one set, slide it up against the intermediate housing and see if it lines up - if not, adjust accordingly when I put in new stringers in to hold the V8 - but I am sure pictures of what you did would be a big help. Dave

  lib1@... wrote:

    Hi David,

    All the V-4's and the early V-6's (64,65,66 and some 67's) used a mounting system that employed a top-hung, intermediate housing which bolted to a metal frame with two rubber isolation pucks. The metal frame (at least on my Sportsman) then bolted into the floor stringers and secured the two transom (lifting) eyes. Thus, the early V-6's had a narrow, centered front mount, below the oil pan. When the V-8's came along in 1966 (first Buick 300, then Chevy 307) they discarded the transom frame. Instead they used front and rear wide-stance feet that all bolt to the floor. They probably felt the added torque of the V8's warranted 4-point floor/stringer mounting?

    Thus when converting to the V8, (at least on the older style mount boats), this requires an increase in floor height to get the transom aperature to line up as before. Study the before and after pics of my installation if this all sounds a bit confusing. The metal frame was removed in the "before" pics but is re-installed in the "after" pics, this was not done for motor support but for transom/hull/floor stringer integrity.

    Hope this helps.

    Lee

      ----- Original Message -----
      From: David
      To: omc-boats@...
      Sent: Tuesday, May 16, 2006 8:32 AM
      Subject: Re: [omc-boats] Small Block Chevy V8's

      Hi Lee,
      I would have to dig up the title for the year - but it was originally a V4 2 cycle - I put a V6 in it back about 13 years ago - that V6 had the old front motor mount, as I recall it had a few bolt holes for adjusting the drive trim? and I put a large aluminum plate across the boat - 1/4" thick 12" wide and bolted that to the floor then mounted the motor mounts to it - it worked our very well - now with the V8, I intend to pull the floor and glass in a structure to hold the newer aluminum floor mount - I am assuming the engine with that mount will line up? since the V6 with the old mount did? but guess I'll find out about that when I work on it. Dave

      lib1@... wrote:

        David,

        What year is your 17 Deluxe? What engine was in it originally? Just curious if it had the stern or floor mounts?

        Lee
          ----- Original Message -----
          From: David
          To: omc-boats@...
          Sent: Monday, May 15, 2006 2:09 PM
          Subject: Re: [omc-boats] Small Block Chevy V8's

          I have a 307 from my Rogue - I pulled it and scraped the boat out - was a nice rig but I wanted the engine to put in my 17' Deluxe - it is in there now, but just sitting - not mounted etc. - no time - but it is a great engine - Rochester quad that sucks gas on the top end, but cruising was ok on gas. Dave

          lib1@... wrote:

            Hi,

            I'm curious if anyone on this list has experience running a Chevy V8 with an OMC sterndrive?

            The 307 or the later 305 or 350?

            Lee Shuster

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Received on Wednesday, 17 May 2006