Gray marine fireball 327

Engines, Shafts, Steering, Struts, Rudders, etc.
Hyperjump
Member
Posts: 15
Joined: Sun Jun 26, 2016 4:40 am

Gray marine fireball 327

Postby Hyperjump » Mon Nov 21, 2016 7:21 am

After winterizing my 327 gray marine fireball engine, mechanic said needs rebuilt. Another mechanic said just heads and a carb .They both said that motor was designed to run leaded gas not ethanol gas. She spits carbon out exhaust and I had to put 1 to 1-1/2 quarts of oil every few times running her. Shes not leaking oil in bilge . Motor runs strong, just not sure what road to take. Just wondering if its worth the money to rebuild or swap out for a either a 318 or 360 Chrysler , or a 350 Chevy . Parts for either of them are easy to come buy. My boat is a 1966 26 ft express. Either way I go shes getting fixed. Any suggestions ...... Thanks
:D HYPERJUMP :D
1966 26 Ft Express
Saybrook , Ohio
Lake Erie

EWRice
Royal Aluminum Star
Posts: 201
Joined: Thu Feb 04, 2016 12:37 pm

Re: Gray marine fireball 327

Postby EWRice » Mon Nov 21, 2016 3:41 pm

I will start off by saying this about the 327: it is an expensive overhaul. The 327 I rebuilt for my Thompson I think I had around $1900 just in parts. Add machine shop bill and we've exceeded $2700. I had good exhaust manifolds which was a plus. If you do need to rebuild, ask yourself how much you like that 327.

That being said, make darn sure that your engine needs overhauled before taking that leap. Its good you got a second opinion, maybe a third is necessary. Don't tell them what the first two told you either. The Rambler engines were known for valve guide issues so I wouldn't be surprised if that was your issue. If that is the case, the Rambler is an easy head job. This would be a good opportunity for a machine shop to install hardened exhaust seats. This is a MUST if your heads are being rebuilt.

A good mechanic will be able to do a leak down test on your engine and verify where the problem lies. Also, without any tools, you can pull the valve covers and check some of the valves for play.
Muskegon Lake
1972 32' Express flybridge
Twin 318s
On board air & prime 920
1963 Thompson Super Sea Lancer
Graymarine 327
1961 Alumacraft 12'
'55 10hp Johnson

Fastjeff
Site Admin
Posts: 867
Joined: Sat Jul 12, 2014 5:06 am

Re: Gray marine fireball 327

Postby Fastjeff » Tue Nov 22, 2016 6:08 am

The condition of those hard-to-find manifolds should be what decides the issue: If they are bad, look for another engine.

Jeff
"We live at the bottom of an ocean of air, not at the top." General Marvage Slatington

Hyperjump
Member
Posts: 15
Joined: Sun Jun 26, 2016 4:40 am

Re: Gray marine fireball 327

Postby Hyperjump » Fri Nov 25, 2016 4:30 am

Thanks to all. Going to do some more digging into my motor. I hope its just head job.
:D HYPERJUMP :D
1966 26 Ft Express
Saybrook , Ohio
Lake Erie