Steel bolts in aluminum heads
November 21st, 2014, 03:07 AM
#1
Rodney
Thread Starter
Join Date: Jun 2011
Location: Houston, TX
Posts: 2,413
Steel bolts in aluminum heads
OK guys, I am venturing into new territory (at least for me) and have decided to run aluminum heads on my new small block build. I got a good deal on some brand new, ProComp heads and an E-brock 7111 manifold, but I have some questions about installing the heads:
1. Does anyone use anti-seize grease on the spark plugs and header bolts to prevent galling and stripping the threads in the aluminum heads?
2. Do I need to reduce the intake and exhaust bolts torque settings for the aluminum heads or can I use the published values in the CSM?
3. Do I need to use a different head gasket because because of the thermal expansion difference between iron and aluminum? What is recommended?
Thanks
Rodney
1. Does anyone use anti-seize grease on the spark plugs and header bolts to prevent galling and stripping the threads in the aluminum heads?
2. Do I need to reduce the intake and exhaust bolts torque settings for the aluminum heads or can I use the published values in the CSM?
3. Do I need to use a different head gasket because because of the thermal expansion difference between iron and aluminum? What is recommended?
Thanks
Rodney
November 21st, 2014, 04:14 AM
#2
Registered User
Join Date: Nov 2008
Location: Central Fl
Posts: 7,971
OK guys, I am venturing into new territory (at least for me) and have decided to run aluminum heads on my new small block build. I got a good deal on some brand new, ProComp heads and an E-brock 7111 manifold, but I have some questions about installing the heads:
1. Does anyone use anti-seize grease on the spark plugs and header bolts to prevent galling and stripping the threads in the aluminum heads? Yes on both.
2. Do I need to reduce the intake and exhaust bolts torque settings for the aluminum heads or can I use the published values in the CSM? No but don't use the stock bolts, buy good ones.
3. Do I need to use a different head gasket because because of the thermal expansion difference between iron and aluminum? What is recommended? Yes, a multi layer steel is good i.e., Mr Gasket Ultra Seal or similar.
Thanks
Rodney
1. Does anyone use anti-seize grease on the spark plugs and header bolts to prevent galling and stripping the threads in the aluminum heads? Yes on both.
2. Do I need to reduce the intake and exhaust bolts torque settings for the aluminum heads or can I use the published values in the CSM? No but don't use the stock bolts, buy good ones.
3. Do I need to use a different head gasket because because of the thermal expansion difference between iron and aluminum? What is recommended? Yes, a multi layer steel is good i.e., Mr Gasket Ultra Seal or similar.
Thanks
Rodney
Thanks.
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