Question on head gasket and oil additive

big blue galaxie · 01-21-2009, 10:32 AM

Get online and get their main number out of Superior, WI and purchase a dealership. That way you can get the oil at dealer cost and save on paying retail for it. www.amsoilsynthetics.com

Nova4301 · 01-21-2009, 11:04 AM

should I mix the pro blend with the amsoil?

thanks for the info...I got set up with Amsoil synthetics and ordered some.

big blue galaxie · 01-21-2009, 11:20 AM

Absolutely. To me it's the ultimate in protection. I'll give you an example; my wife's daily driver we bought new and after I put some miles on it (about 1500) I switched over to Amsoil and Problended it with the Racing Concentrate. Now it has over 122k on it, oil consumption is about the same and I only have changed the oil and filter 8 times. Saved lots of money these last 5 years with this combo. ProBlend is located in Winston-Salem, NC and get their direct line at the factory.

55 Chevy · 01-21-2009, 12:37 PM

The bore size on a new # 3995633 is 3.980. This gasket was used for the 307 motor,is steel shim & has a coating on it.
As far as I know G.M. has discontinued this gasket.
Not sure of the Fel Pro cross over #.

There are a couple of smaller bore gaskets G.M. # 14085906@ 3.875 & # 462690@ 3.875. They are both steel shim & have no coating on them.Also no longer available.

Just curious,what is the exact bore size of your motor?

Allan

Nova4301 · 01-21-2009, 02:15 PM

Quote:

Originally Posted by 55 Chevy

The bore size on a new # 3995633 is 3.980. This gasket was used for the 307 motor,is steel shim & has a coating on it.
As far as I know G.M. has discontinued this gasket.
Not sure of the Fel Pro cross over #.

There are a couple of smaller bore gaskets G.M. # 14085906@ 3.875 & # 462690@ 3.875. They are both steel shim & have no coating on them.Also no longer available.

Just curious,what is the exact bore size of your motor?

Allan

I am building a 307 .060 over. 3.935 is my bore size, so that GM #3995633 would be perfect, but if it is not avaliable then I will have to find a gasket with similar specs.

In case anyone is curious, I found the Fel-pro replacement head gasket for the 307 GM#3995633. It is a Fel-Pro #7733SH1 and it is the same except the bore size is 4.100.

Myron, do you run the 0W-30? and how does the Amsoil racing oil compare...I didn't see a 0W-30 racing oil?

Alan Roehrich · 01-21-2009, 09:31 PM

Cometic will make gaskets for you, to your specifications. They are certainly pricey, as much as $200 for a set. But if you are careful, you can reuse them 2-3 times, or more. If you give them a bore size and a thickness, they'll be close to dead on. Mine have not varied more than 0.005" on bore size (always big, not small) and no more than 0.002" on thickness (always thick, not thin).

big blue galaxie · 01-21-2009, 09:50 PM

The motor oil is now named Amsoil Signature Series 0W30. The also have a 0W20.

Tim H · 01-21-2009, 09:53 PM

Castrol also frowns on using any additives with their oil. As the rep stated " why undo something that our chemists have engineered into our oil ?"

House of Darts · 01-25-2009, 02:08 AM

Mobil/ Mobil 1 makes the base oils for all synthetic oils. I used to sell race oils. When you read the specs for synthetic motor oil and compare them all, this is what you will find: everyone has a hard one for additives that makes their oil different. When you look very close, many are only slightly different competitors to Mobil 1. They really only offer slight advantages. Most are only noticeable in lab reports. SAVE YOUR MONEY. Brad penn 0-30,10-30 semi synthetic and Valvolone VR1 are the best for the $ spent. Amsoil does offer a oil analisys that will answer any questions about the oil you are using. They contract with a private company. You can deal with this company direct. OH BY THE WAY, ask 50 racers about oil and you'll get 53 answers.

01-21-2009, 10:32 AM	#1
big blue galaxie Junior Member Join Date: Jan 2009 Posts: 36 Likes: 0 Liked 0 Times in 0 Posts	Re: Question on head gasket and oil additive Get online and get their main number out of Superior, WI and purchase a dealership. That way you can get the oil at dealer cost and save on paying retail for it. www.amsoilsynthetics.com

01-21-2009, 11:04 AM	#2
Nova4301 Junior Member Join Date: Sep 2008 Location: Moore, OK Posts: 54 Likes: 0 Liked 0 Times in 0 Posts	Re: Question on head gasket and oil additive should I mix the pro blend with the amsoil? thanks for the info...I got set up with Amsoil synthetics and ordered some. __________________ Tim Wilson HR/SST 4301

01-21-2009, 12:37 PM	#4
55 Chevy Member Join Date: Feb 2008 Location: Calgary,Alberta area Posts: 229 Likes: 23 Liked 20 Times in 15 Posts	Re: Question on head gasket and oil additive The bore size on a new # 3995633 is 3.980. This gasket was used for the 307 motor,is steel shim & has a coating on it. As far as I know G.M. has discontinued this gasket. Not sure of the Fel Pro cross over #. There are a couple of smaller bore gaskets G.M. # 14085906@ 3.875 & # 462690@ 3.875. They are both steel shim & have no coating on them.Also no longer available. Just curious,what is the exact bore size of your motor? Allan

01-21-2009, 09:31 PM	#6
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,118 Likes: 1,573 Liked 1,837 Times in 417 Posts	Re: Question on head gasket and oil additive Cometic will make gaskets for you, to your specifications. They are certainly pricey, as much as $200 for a set. But if you are careful, you can reuse them 2-3 times, or more. If you give them a bore size and a thickness, they'll be close to dead on. Mine have not varied more than 0.005" on bore size (always big, not small) and no more than 0.002" on thickness (always thick, not thin). __________________ Alan Roehrich 212A G/S

01-21-2009, 09:53 PM	#8
Tim H VIP Member Join Date: Jan 2007 Posts: 1,042 Likes: 1,076 Liked 482 Times in 159 Posts	Re: Question on head gasket and oil additive Castrol also frowns on using any additives with their oil. As the rep stated " why undo something that our chemists have engineered into our oil ?"

01-21-2009, 11:20 AM	#3
big blue galaxie Junior Member Join Date: Jan 2009 Posts: 36 Likes: 0 Liked 0 Times in 0 Posts	Re: Question on head gasket and oil additive Absolutely. To me it's the ultimate in protection. I'll give you an example; my wife's daily driver we bought new and after I put some miles on it (about 1500) I switched over to Amsoil and Problended it with the Racing Concentrate. Now it has over 122k on it, oil consumption is about the same and I only have changed the oil and filter 8 times. Saved lots of money these last 5 years with this combo. ProBlend is located in Winston-Salem, NC and get their direct line at the factory.

01-21-2009, 09:50 PM	#7
big blue galaxie Junior Member Join Date: Jan 2009 Posts: 36 Likes: 0 Liked 0 Times in 0 Posts	Re: Question on head gasket and oil additive The motor oil is now named Amsoil Signature Series 0W30. The also have a 0W20.

01-25-2009, 02:08 AM	#9
House of Darts Member Join Date: Mar 2007 Posts: 346 Likes: 19 Liked 20 Times in 15 Posts	Re: Question on head gasket and oil additive Mobil/ Mobil 1 makes the base oils for all synthetic oils. I used to sell race oils. When you read the specs for synthetic motor oil and compare them all, this is what you will find: everyone has a hard one for additives that makes their oil different. When you look very close, many are only slightly different competitors to Mobil 1. They really only offer slight advantages. Most are only noticeable in lab reports. SAVE YOUR MONEY. Brad penn 0-30,10-30 semi synthetic and Valvolone VR1 are the best for the $ spent. Amsoil does offer a oil analisys that will answer any questions about the oil you are using. They contract with a private company. You can deal with this company direct. OH BY THE WAY, ask 50 racers about oil and you'll get 53 answers.