351C low oil pressure when hot - Page 2

hollenjoe · #16 (**permalink**) 06-26-2009, 09:27 PM

Very wrong my friend, 351m or 400 simply had a lack of performance ground, which now days has been covered, also a bigger port intake would decrease port velocity not increase it, it will benefit on higher rpms not low, and the 351c 2v was as low powered and underachieved as any 400 2v in stock form....

300 Buster · #17 (**permalink**) 06-26-2009, 11:37 PM

I wasn't sure on 4V intake 2V ported head being good for low end torque,it was just something I had heard years ago,but you can take that oil pump suggestion to the bank,it's just good insurance,I've replaced 5 rusted out oil pans ,2-300's,302,351w and a 400,always replaced oil pump with Melling and was always pleased with pressure.I guess I'm not up to date on the 351m and 400,I know in stock form they never showed me much,but I come out of the FE era.I was 18 in 1968 and seen all kinds of magic,then anti-pollution hit and things got depressing,these last few years the magic has been coming back strong ,but I don't how much longer it will go with everything going on.Love that GT40.

mudder460 · #18 (**permalink**) 06-27-2009, 02:47 AM

So IF the heads are ported to match I should just keep the 4v intake? I am fine with that. It will be 2 weeks till I can get to look at the motor and see if there was any porting. I would love to do a nice rebuild on this motor. I am going to see if it has been bored when I get it home and on a stand. I am going to price having it tanked and new cam bearings put in. I just found a shop by my house so I will check it out this week. I just wish this economy was doing better so I could sell more of my toys for the money! LOL

hollenjoe · #19 (**permalink**) 06-27-2009, 02:15 PM

Yeah the pump is a good idea, now days theres also a fix made on the oil pasages in the mains but I went also with the hv pump...

yeah keep the 4v intake, it would be a waste of cash to change to an aluminium one, are you using it on a car or truck?

mudder460 · #20 (**permalink**) 06-27-2009, 05:24 PM

This is going in my truck in my sig. It is just going to be a mud toy/ weekend driver. I did some looking around last night at work ad read that the oil mod is only needed it you are going to be turning high rpms. I found the stock redline for this motor is 5400, I really don't plan to rev it higher than that. I will keep the 4v intake, I was kinda hoping to anyways and I will get the hv oil pump as well. Here is a my pics got of the motor, let me know what you think. http://s82.photobucket.com/albums/j262/aj5601/351C/

Also, where exactly is the castin numbers mon the block located?

drof46 · #21 (**permalink**) 06-28-2009, 11:32 PM

drivers side I think. About midways down. Throw it on your engine stand and rotate it. Have your wire brush handy and you'll find it. Glad to see you got one. I also picked up another one. Its a 2V, but for $100 I figured it was a safe purchase. Will oil her down and wrap in plastic until I'm ready to fix it up.

Heres what it should look like when your done, lol. ***The cleveland pictured is not the one I just bought.*** My project is coming along nicely. Plan to have my truck running in the next week.

mudder460 · #22 (**permalink**) 06-29-2009, 04:22 PM

Thanks drof, I am really glad I got one as well. I have always wanted one. The motor is at a friends house now and he knows what he is looking for, so I will call him later. At least now I know what side it is on. That is crazy you got yourself another motor, I wish I had the shop to have a few sit around. I used to have a D0VE 460 but I had to get rid of it cause of no room. The truck is looking great, I can't wait to see it. Did you do the oil mod to your motor?

drof46 · #23 (**permalink**) 06-29-2009, 10:54 PM

No oil mod yet. I bought this motor already rebuilt for $1200 and that included a new oil pump. Added all the extras on afterwards of course. I plan to have fun, but doubt I'll be going over 5,000 rpm too often. No telling what the future holds though. I have the crane roller rocker conversion and some roller rockers to throw on it sometime in the future.

Plan to make one of the get togethers when shes running and I know its reliable. Just don't feel right driving my X brand to a ford get together, lol. And I'm sure not driving my wifes ford windstar. I'd likely have to turn in my man card.

mudder460 · #24 (**permalink**) 06-30-2009, 11:43 AM

They won't hound you too bad, I bring the family in our Kia mini van or if I go by myself I have a Pontiac G5. I have only ever made it to one g2g with Mater.

I am still undecided about the mod, I know it is mainly if you are doing high rpms. I don't plan on revving that high either but you never know what could happen when playing off road. I am just thinking cheap insurance, I will do the hv pump though.....I am thinking to use the Melling pump.

husker · #25 (**permalink**) 06-30-2009, 05:00 PM

I have a 390 in a 64 tbird that has low oil pressure when hot and a 460 in my 54 F250 that also gets low when hot. I have started running 15-40 diesel oil in both and that has helped bring the pressure up about 8-10 lbs according to the guages in both when hot. Both were close to 0 at idle when hot. I don't want to do a rebuild on either at this point because I don't drive them that much, less than a couple of thousand miles a year. Neither uses much oil and at the rate I drive them, I can probably limp along for 10 years without having to do a rebuild. That is something you might try if you don't want to rebuild right now.

mudder460 · #26 (**permalink**) 06-30-2009, 08:26 PM

I had thought about that, just letting it go for now. I just don't want to have to repull the engine and do it. I would rather fix it now while I still have my old engine in my truck and this one out. Plus I am going to be running this engine in off road pretty good, don't want to blow it up.

$Simpleman76 · #27 (**permalink**) 07-07-2009, 01:23 AM

I put a 351C 2v heads in my 78 f150 4x4, just to let you know I was unable to find headers that would work, I tried matching up a set of the ceramic coated headers but clearance between the engine mount and the lower tube on the headers made it impossible to mount them to the engine, the set I had was for a 400 4x4, so I found a set of manifolds at the junkyard for $25, i wish I had of got the motor at the same time i got the manifolds because i went back and the rest of the motor was gone, it was kind of a pain replacing the 400 with the 351c just because of going from a big block down to the small block just because of having to change bellhousing the finding engine mounts that would would work, mine also is a four speed, but I am glad I went with the cleveland, but is was more expensive to have rebuilt than say a 302, the engine man told me he would not build another one like mine for the price he give me because of the extra machine work to install the roller cam and rockers, but my oil pressure is steady just under 75psi and boy is it a smooth running engine