1970 351 cleveland

mattsstang · January 17th, 2007, 01:54 AM

Hey guys. If anyone knows about a 351 clevelands id love some advice. I have a 1970 mustang mach 1 with the 351 cleveland 2 barrel engine with a holley 600 on it and it goes prety good. I let the car sit for about 2 years cause i was travelling and now that im back i started it up and there was cooland in the oil ( it was white) and there was oil in the radiator. The engine was rebuilt 3500 miles ago. It was broken in properly. The heads were not cracked. They were checked. I have no idea where this leak can be coming from. Do you guys have any ideas? The 351 in 1970 was changed so no oil or water goes through the intake manifold. All i can think of is the head gaskets or the timing chain cover. DOes anyone have any other ideas what it could Be or where the leak could be coming from. I want to price this thing out and get fixing it. My uncle put it together for me so i dont really know all the seals in teh engine ect. What is mostt likely to least likely? THANK YOU GUYS.

I had water wetter in it to bring down the temp when it was running. It may have eaten into something.

MATT

Horseshoeing · January 17th, 2007, 05:55 AM

Did the radiator water freeze and crack your heads or block?

mattsstang · January 17th, 2007, 04:18 PM

Negative on the freezing. I had antifreeze in it and there was enough in it . The garage it is sitting in is heated.

Horseshoeing · January 18th, 2007, 06:03 AM

Are you losing water from your radiator? I am going to guess that is a yes. Did you change your oil and it still gets white? Sometimes when a car sits it will get water in the oil.

mattsstang · January 18th, 2007, 05:37 PM

No there was no spot on the floor where the rad could have leaked. ALso its a rebuilt radiator. The car is fully restored it is just sitting. Somehow it is getting into the oil. I just need to know the most likely thing that could go wrong involving engine seals and what not cause thats where i am going to start.

Horseshoeing · January 19th, 2007, 06:39 AM

Did you change your oil when you found water in it? If a car sits, water can get in it. It happened to my mother's old Mustang. If you run you car all the time it gets hot an boils the water off and you never know it.

I was asking about the losing water from your radiator to see if the water in your block was coming from your radiator.

SemperFi · January 19th, 2007, 10:11 AM

All good suggestions on the water getting into the oil, but there seems to be a cross contamination - he says there is also oil in the radiator. It could be two different things. Oil in radiator could be residual oil from the rebuild of rad., water in block could just be from condensation from sitting. I always fill my blocks & heads with oil when letting them sit. I would flush and refill both your rad. and engine and run it to operating temp. and then check fluids from there. It is hard to give advice and say without seeing or knowing exactly how much water is in engine oil/lost from radiator or how much oil has been lost from engine/into coolant. If you are really concerned I would change the head gaskets right away and check the head & block to be sure you have good seating, you may also see discoloration on head gaskets or other evidence of leakage. If heads/block are good then you may have a leak in the block between your coolant ports. Did you change oil after engine was rebuilt or just prior to storage?

mattsstang · January 19th, 2007, 09:31 PM

I changed the oil prior to storage. like mabye 500 miles before it was stored. Between the block and the cooling ports is there a gasket? i guess i will find out when i take the heads off. I plan to get a engine gasket kit and then take it apart and do all the gaskets again. I need to check the main bearings because antifreeze was in the oil and in the crankcase. I had the heads magnafluxed before the rebuild and the block was checked for cracks. All machineing was done also. It was not overheated ever. If there is seals in between the cooling ports i assume that if i got a gasket set for the engine some would come with it. Tell me what you think thanks

SemperFi · January 19th, 2007, 10:54 PM

There are no gaskets between block and cooling ports, they are cast in the block. They are cavities, or tunnels for lack of a better description, that the water/coolant flows through the engine block to cool it. Sounds like you did everything right - gaskets could have just failed from sitting. Really hard to say. Tear it down and inspect it and put new gaskets on. Just keep a real close eye on your fluids after you are done. Good luck & let us know what you find & how it turns out.

January 17th, 2007, 01:54 AM	#1
mattsstang Newbie Join Date: Jan 2007 Posts: 4 iTrader: 0 reviews	1970 351 cleveland Hey guys. If anyone knows about a 351 clevelands id love some advice. I have a 1970 mustang mach 1 with the 351 cleveland 2 barrel engine with a holley 600 on it and it goes prety good. I let the car sit for about 2 years cause i was travelling and now that im back i started it up and there was cooland in the oil ( it was white) and there was oil in the radiator. The engine was rebuilt 3500 miles ago. It was broken in properly. The heads were not cracked. They were checked. I have no idea where this leak can be coming from. Do you guys have any ideas? The 351 in 1970 was changed so no oil or water goes through the intake manifold. All i can think of is the head gaskets or the timing chain cover. DOes anyone have any other ideas what it could Be or where the leak could be coming from. I want to price this thing out and get fixing it. My uncle put it together for me so i dont really know all the seals in teh engine ect. What is mostt likely to least likely? THANK YOU GUYS. I had water wetter in it to bring down the temp when it was running. It may have eaten into something. MATT

January 17th, 2007, 05:55 AM	#2
Horseshoeing Classic Moderator Join Date: Aug 2005 Location: GA Posts: 4,177 iTrader: 0 reviews	Did the radiator water freeze and crack your heads or block? __________________ Classic Mustangs are the best! Get one.

January 18th, 2007, 06:03 AM	#4
Horseshoeing Classic Moderator Join Date: Aug 2005 Location: GA Posts: 4,177 iTrader: 0 reviews	Are you losing water from your radiator? I am going to guess that is a yes. Did you change your oil and it still gets white? Sometimes when a car sits it will get water in the oil. __________________ Classic Mustangs are the best! Get one.

January 19th, 2007, 06:39 AM	#6
Horseshoeing Classic Moderator Join Date: Aug 2005 Location: GA Posts: 4,177 iTrader: 0 reviews	Did you change your oil when you found water in it? If a car sits, water can get in it. It happened to my mother's old Mustang. If you run you car all the time it gets hot an boils the water off and you never know it. I was asking about the losing water from your radiator to see if the water in your block was coming from your radiator. __________________ Classic Mustangs are the best! Get one.

January 19th, 2007, 10:11 AM	#7
SemperFi Newbie Join Date: Jan 2007 Location: between here & there (WI) Posts: 29 iTrader: 0 reviews	All good suggestions on the water getting into the oil, but there seems to be a cross contamination - he says there is also oil in the radiator. It could be two different things. Oil in radiator could be residual oil from the rebuild of rad., water in block could just be from condensation from sitting. I always fill my blocks & heads with oil when letting them sit. I would flush and refill both your rad. and engine and run it to operating temp. and then check fluids from there. It is hard to give advice and say without seeing or knowing exactly how much water is in engine oil/lost from radiator or how much oil has been lost from engine/into coolant. If you are really concerned I would change the head gaskets right away and check the head & block to be sure you have good seating, you may also see discoloration on head gaskets or other evidence of leakage. If heads/block are good then you may have a leak in the block between your coolant ports. Did you change oil after engine was rebuilt or just prior to storage? __________________ SemperFi - God, Corps, Country & Mustangs.

January 17th, 2007, 04:18 PM	#3
mattsstang Newbie Join Date: Jan 2007 Posts: 4 iTrader: 0 reviews	Negative on the freezing. I had antifreeze in it and there was enough in it . The garage it is sitting in is heated.

January 18th, 2007, 05:37 PM	#5
mattsstang Newbie Join Date: Jan 2007 Posts: 4 iTrader: 0 reviews	No there was no spot on the floor where the rad could have leaked. ALso its a rebuilt radiator. The car is fully restored it is just sitting. Somehow it is getting into the oil. I just need to know the most likely thing that could go wrong involving engine seals and what not cause thats where i am going to start.

January 19th, 2007, 09:31 PM	#8
mattsstang Newbie Join Date: Jan 2007 Posts: 4 iTrader: 0 reviews	I changed the oil prior to storage. like mabye 500 miles before it was stored. Between the block and the cooling ports is there a gasket? i guess i will find out when i take the heads off. I plan to get a engine gasket kit and then take it apart and do all the gaskets again. I need to check the main bearings because antifreeze was in the oil and in the crankcase. I had the heads magnafluxed before the rebuild and the block was checked for cracks. All machineing was done also. It was not overheated ever. If there is seals in between the cooling ports i assume that if i got a gasket set for the engine some would come with it. Tell me what you think thanks

January 19th, 2007, 10:54 PM	#9
SemperFi Newbie Join Date: Jan 2007 Location: between here & there (WI) Posts: 29 iTrader: 0 reviews	There are no gaskets between block and cooling ports, they are cast in the block. They are cavities, or tunnels for lack of a better description, that the water/coolant flows through the engine block to cool it. Sounds like you did everything right - gaskets could have just failed from sitting. Really hard to say. Tear it down and inspect it and put new gaskets on. Just keep a real close eye on your fluids after you are done. Good luck & let us know what you find & how it turns out. __________________ SemperFi - God, Corps, Country & Mustangs.

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