400 head bolt torque specs
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Junior User
Joined: Jan 2004
Posts: 63
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From: Vancouver
400 head bolt torque specs
Im installing new head gaskets in a 79 400, but I cannot remember what my old manual( cant find it) said about the torque sequence and final torque values..anyone got the specs and sequence from the manual???
Last edited by Torque1st; Jun 16, 2005 at 12:13 PM.
Elder User
Joined: Jun 2003
Posts: 886
Likes: 1
From: Houston/Hope BC
3-8-2-9-7-4-6-5-10-1 or similar squeeze from center out X pattern. Oil threads and clamp area interface. Block threads should chased already with tap (while appying vacuum, if still assembled short block, otherwise cleaned) and bolts threads cleaned on wire brush. GL
More Turbo
Joined: Oct 2001
Posts: 713
Likes: 1
From: Augusta.GA
Torquing Heads Concert
Thanks for asking Eastvanmikee, I needed to know myself.
Ecuri, I understood the oiling of threads but what is clamp area interface? Is it the mating surfaces of the block and heads?
Ecuri, I understood the oiling of threads but what is clamp area interface? Is it the mating surfaces of the block and heads?
Elder User
Joined: Jun 2003
Posts: 886
Likes: 1
From: Houston/Hope BC
sorry, I was trying to think of what the real name is for whatever you call the donut-shaped area under the head of the bolt where it sqeezes down on the head... anyway, it should be oiled, it just takes a drop or two. block and heads surfaces should be super-clean of oil or anything and dry.
More Turbo
Joined: Oct 2001
Posts: 713
Likes: 1
From: Augusta.GA
Don't oil Head
Thanks. I thought I read the heads and block surfaces were to be oil free and dry, but wasn't sure. The head gasket gets no sealant whatsoever right? Any need to use rubbing alcohol on the surfaces?
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Elder User
Joined: Jun 2003
Posts: 886
Likes: 1
From: Houston/Hope BC
Correct! no sealants! I think the gaskets can also be flipped accidentally and block a water passage. They have a little tab that sticks out by #1 and #8 holes on the outboard side of the engine. They should come with intructions. The surfaces should be de-greased prior, never tried alchohol. I wipe surfaces right before installation with a spirits soaked rag to get the heavy oil off, then spray with a little brake cleaner and finish with a quick drying blast of compressed air. It is a good idea to cover the valley and stick some rags in the bores when you clean the block surface so you don't wipe or blow any loose dirt into the internals. After I get it clean and take the rags out I shop-vac the valley and holes for little grit that might have fallen of the rags. (I am really **** about getting a clean assembly!) I am generally working with clean parts on a stand, you may want to skip the compressed air on the block if it is dirty and/or in the car, you sure don't want to put any dirt into the engine. 90 PSI air really shove dirt into places it wouln't otherwise go. Make sure you didn't forget or loose either of the locating ring dowels (2 per head). GL
Last edited by Ecuri; Jun 18, 2005 at 02:25 PM.
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More Turbo
Joined: Oct 2001
Posts: 713
Likes: 1
From: Augusta.GA
Lifter Pre-load
Alright, I was gonna wait until I got the heads on to start asking about this. I've got a thread going on rockers. was going to see the responses i got on that to digest the next move.
But since you menioned it... tell me what lifter preload, and if you follow the same level of detail as before, I might even do it right
But since you menioned it... tell me what lifter preload, and if you follow the same level of detail as before, I might even do it right
Elder User
Joined: Jun 2003
Posts: 886
Likes: 1
From: Houston/Hope BC
http://cranecams.com/?show=faq&id=3
Is good except where they say "scribe a line on the pushrod", use a fine-line sharpie pen.
and/or
Search the posts here, there was a long thread a year or more ago where we discussed 2 or three different methods with stock rockers. Not that I don't want to tell you, it's just been done before and better than I can do it again!
Is good except where they say "scribe a line on the pushrod", use a fine-line sharpie pen.
and/or
Search the posts here, there was a long thread a year or more ago where we discussed 2 or three different methods with stock rockers. Not that I don't want to tell you, it's just been done before and better than I can do it again!
Cargo Master
Joined: May 2003
Posts: 2,561
Likes: 1
From: Earth
Originally Posted by Ecuri
http://cranecams.com/?show=faq&id=3
Search the posts here, there was a long thread a year or more ago where we discussed 2 or three different methods with stock rockers. Not that I don't want to tell you, it's just been done before and better than I can do it again!
Search the posts here, there was a long thread a year or more ago where we discussed 2 or three different methods with stock rockers. Not that I don't want to tell you, it's just been done before and better than I can do it again!
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