jrbartlett Posted November 1, 2006 Share Posted November 1, 2006 What foot-pound reading do you guys recommend for the head bolts on a '29 Super 8? I need to replace the head gasket. Link to comment Share on other sites More sharing options...
Guest imported_Speedster Posted November 2, 2006 Share Posted November 2, 2006 If I remember correctly the book said 65 Max. but I did mine to about 55 on the 626 Standard-8, and it worked great. I didn't want to take a chance on cracking the block. I used the sandwich multi-layer type gasket, probably need a little more with the solid type gasket (maybe 60). Don't forget to recheck it after running for a while. I did the 645s Super-8 to 55 also but I haven't started it yet.Those low compression engines just don't require the high torque. Link to comment Share on other sites More sharing options...
Guest Albert Posted November 2, 2006 Share Posted November 2, 2006 the flat head 8's in 54 where 62ft/bs Link to comment Share on other sites More sharing options...
Clipper47 Posted November 2, 2006 Share Posted November 2, 2006 I torqued my '47 356" engine head nuts to 65 f/lbs. I think the book says 62-65. Link to comment Share on other sites More sharing options...
Guest imported_PackardV8 Posted November 2, 2006 Share Posted November 2, 2006 Torque on bolts is (usualy) NOT model, make and year specific. Bolt Torque is usualy (but not always) speciific to the bolt thread diameter and there are charts avaialble for this . The exceptions are when threading into aluminium or other non-ferrous materials. SO, what size are the head bolts??????????? Link to comment Share on other sites More sharing options...
jrbartlett Posted November 2, 2006 Author Share Posted November 2, 2006 Don't know the stud diameter yet. Haven't taken anything off. But I do have a chart showing optimal torque for various sizes. Just didn't know if a head might have a different (i.e. lower) torque spec. Link to comment Share on other sites More sharing options...
Guest imported_Speedster Posted November 2, 2006 Share Posted November 2, 2006 Yes, I've heard several Sob-stories about cracked blocks, so that's why I recommend 55 max. <img src="http://forums.aaca.org/images/graemlins/crazy.gif" alt="" /> The Older the engine the Easier it seems to be to crack. <img src="http://forums.aaca.org/images/graemlins/frown.gif" alt="" /> Metal changes it's brittleness over time, caused by heating and cooling. I also recommend the original sandwich type head-gasket, since it requires less torque to seal, compensates for uneven head and block surfaces and seems to cushion some, even tho it does cost more than the solid gasket. Link to comment Share on other sites More sharing options...
Guest imported_PackardV8 Posted November 11, 2006 Share Posted November 11, 2006 Near the BOTTOM of this link is a GENERAL chart for bolt torque.http://www.oregonvintage.com/threads.html Link to comment Share on other sites More sharing options...
Guest imported_Speedster Posted November 11, 2006 Share Posted November 11, 2006 Pre-war engine blocks certainly Won't hold up to the torque specs in that chart. <img src="http://forums.aaca.org/images/graemlins/crazy.gif" alt="" /> Those are for the bolts only. If you torque a '29 head to 132 ft/lbs, you will have about 100 cracks in the block. <img src="http://forums.aaca.org/images/graemlins/crazy.gif" alt="" /> Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now