Cylinder height is the same , I don't have a way to accurately measure the bore but they appear to be the same cylinders that are on my 290 so I believe you are right they are just a set of extra cylinders, I appreciate the help.

So do y'all think the spare cylinders I got are 435 cylinders, if so what is involved in putting them on my 290 ?

I bought this boat with a 0290 on it and it came with some extra parts like cylinders and pistons but the cylinders are different than my 0290 cylinders can anyone tell me what they are?

I called Greg (GMAC) on a Saturday and told him what I wanted he shipped my parts Monday and I had them at my house Wednesday, great guy to deal with and a wealth of knowledge that is happy to help and answer questions I would recommend him to anyone and will be buying any parts I need from him in t...

Thank you

Thanks what's the best way to get ahold of him?

Thanks for the info, who is it on here that rebuilds mags? Does he do them?

Who works on A/C engines and mags in north central Florida, Lake City, Ocala, Gainesville area?

Thanks for the info, what horsepower is it 125?

External hex, 4-3/8, 4-1/2"

Trying to add pics thanks for the help .

I saw that thread but I don't think it's a 0320 or 0360 I think it's a 0290 I'm just not for sure .

I am looking at buying a boat with a 4 cylinder Lycoming on it but it has no data plate on it and I have no idea what engine it is I have pics on my phone but don't know how to post them can I send them to someone to post for me and figure out what engine it is?

Scorpion Airboats is in O'Brien FL .

Darn sure looks good! Let us know how it turns out.

What happened with this engine did you get it in the dyno or on your boat yet, curious how it performed?

I don't know if it was mentioned in this thread if it was I missed it, but how do you plan to do you starter mount, just curious because I am planning on a Ford build in the future , when you get to that point post some pics of it.

Is that a good place to ride, never been there but don't live too far from it I wondered how it was there I'm sure the water is up with all the rain we have had.

I don't have any diameter limitations, not sure about the bolt pattern as I don't have it here in front of me it's at my work I'll have to look tomorrow.

Yes I did get a prop adapter from arrow prop, I am going to run it direct drive do you sell a prop that will work on this engine DD?

Looking for a prop adapter for a 4A084 if anyone has one they would like to get rid of.

I have an old K-way here that has a bad gear in it, problem I ran into is there was no gear available for it. I believe it was classic airboats that used to sell them but it has been so long since they made them boxes that they no longer had any parts for them when I called , bearings and seals I fo...

Check out the mini airboat association website there's a whole thread there about an 084 turbo build.
http://miniairboatassoc.com/forum/showt ... urbo-build

Arrowprop.com

Thanks Deano I'll do that.