Formula 233 Registry

The premier site for owners of the famous 233.

Tech Talk (33)

Discussions Replies Latest Activity

305 TO 383 ENGINE SWAP

Has anyone on here done an engine swap from 305 to 383 in their 233. The ole 305 in mine is pretty tired and ineed of replacement. I have b…

Started by Mike Catman

9 Sep 27, 2013
Reply by Glenn Sawyer

prop ideas?

Hi folks, I'm new to this site....but not new to my Formula. It's a 1979 F233 LS (Intercepter) with two Merc 260's that I bought in the mid…

Started by Greg Faulkner

8 Aug 6, 2013
Reply by David

original out drive?

Hi, im a new member and need some info from you guys that have done it! i just bought this boat and am going to put in a 600 hp 496 in it.…

Started by Ron Smith

2 Apr 18, 2013
Reply by Ron Smith

Horse power = speed ?

      Need technical assistance reguarding horse power = speed.  Currently own a 1979 233 formula cuddy and i am pulling out the merc cruis…

Started by Bruce Mathieson

1 Jan 1, 2013
Reply by Robert OHerlihy

78 233 Thunderbird Fuel Tank issue

My parents are moving back to Fla. so they gave me their boat. Its a 78 233 Thunderbird with a 260 Merc. Fuel lines were totally shot. I no…

Started by Randy Testerman

2 Jul 5, 2012
Reply by Jason

Outdrive braided lines to tops of outdrives (not power trim) 233 Twins

Thank you for any help. I am fixing up a 1981 Formula 233 with twin 350's. I absolutely love the boat. I know quite a bit about boats and e…

Started by John Crowther

3 Jun 19, 2012
Reply by Jason

Texas Restoration

First of all, Hello! everybody. I bought a 1972 T-Bird Formula 2 years ago, I love this boat, so much that I am buying a second one. Same y…

Started by Darrel Starnes

1 Jun 6, 2012
Reply by Henry Todd

NEW GUY NEEDING SOME POINTERS ON HIS 233

I just bought my first boat. 1981 233 sportsman. It basically is in working condition but needs alot of tlc. The previous owner did not tak…

Started by Mike Catman

3 Mar 11, 2012
Reply by David

1969 mercruiser 160 WOT, RPM, speed, and prop

Hey guys,      Can anyone tell me what my RPMs should be at WOT, and also what prop size I should be running?  I can't seem to get above 29…

Started by paul

3 Jul 26, 2011
Reply by David

Wiring

Does anyone know where I can find a wiring diagram (for the dash) for my '79 233? Thanks, Toad

Started by Toad

4 Mar 12, 2011
Reply by John Farabee

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