470 Replacement

[projectboatetc]

I have a seized 470 with Alpha I (Chaparral 187XL - 19'), the engine won't turn and it was having water in oil. I think the engine is pretty much shot. So I am thinking to rebuild it or replace it with a 4.3 V6. Is it possible to replace it with 4.3 V6? If so, what is the pros/cons of doing so? I saw someone mentioned the weight gain because of the iron block, but not sure it matters that much.

 

[Don S]

Re: 470 Replacement

All you will need is a complete V6 with Merc exhaust system, coupler, and flywheel housing, new exhaust Y for the V engines, new inner transom shield for the motor mounts, the drive gear ratio MIGHT work, but you will probably have to change props. <br />Then you may have to manufacture stringers and mount pads because the V6 has motor mounts on the sides of the engine while the 470 has a front mount.<br />Other than that, it's a bolt in.

 

[Reel Poor]

Re: 470 Replacement

Don, you forgot the check book and/or credit card.

 

[cosander]

Re: 470 Replacement

incase you didn't know<br /> http://www.breezeworks.net/cgi-bin/...ics.asp?ForumID=1&PagePosition=1&ThreadPage=1

 

[Bondo]

Re: 470 Replacement

Other than that, it's a bolt in.

'Course,.. It's Never a Bolt in.....<br /><br />You'll need a Complete Boattail Engine, with ALL the accessories......<br /><br />You Might get around the inner transom plate,+ Y pipe by plumbing the Exhaust Right Out the Transom.........<br />You'll need to measure the distance between the rear motor mounts,... You'll need 9"s......<br /><br />The Gear Ratio Will Work,.... But you'll No Doubt be needing a New Prop..........<br /><br />And,... You'll need to build an Engine Bed in the Hull....... <br /><br /><br />The 4.3l is the Easiest Swap for the 3.7l there Is..........

 

[Bt Doctur]

Re: 470 Replacement

You could build a 300 cu.in. inline 6. say .030 oversize, mild cam, good flowing head work. should get almost 230 hp out of it. would need to rebuild a new front motor mount cause its a bit longer than a 470.

 

[Bondo]

Re: 470 Replacement

Originally posted by Bt Doctur:<br /> You could build a 300 cu.in. inline 6. say .030 oversize, mild cam, good flowing head work. should get almost 230 hp out of it. would need to rebuild a new front motor mount cause its a bit longer than a 470.

This post bring up an Unusual Question that I Don't know the answer to.............<br /><br />What Pattern IS the Bellhousing Flange on a 470..???......<br />The motor is a Merc. Block, with a Ford Head.....<br /><br />Did Merc. use the Ford small block pattern,..????....<br /><br />Asside from That Question,......<br />I Doubt you'd find Manifolds for a 300cid Inline 6 cylinder........