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Head bolt torque specs and sequence for early 350 malibu motor

Head bolt torque specs and sequence for early model 350 motor I need the specks for this motor

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There are two different torque specs for this engine depending on which bolts you are torquing. This engine uses three different length bolts, the two sets of longer bolts can be torqued to 70 foot pounds, the short set of bolts that go along the bottom of the head should be torqued to 65 foot pounds. Head surface and block surface should be clean, straight and the a new head gasket should be used.

An easy way to guide yourself in the proper sequence is to make a cheat sheet of sorts. Take the headgasket and piece of cardboard about the same size. Using the headgasket as a template, mark each of the bolt holes on the cardboard with a sharpee marker, pencil or pen. Also outline the headgasket and mark the top of your drawing. Now starting from the center bolt as number 1, move either to the right or left, up or down to the next bolt hole and mark that as number 2. Now move to the bolt hole diagonally across from number 2, past Number 1 and mark it as number 3. Continue this sequence of moving diagonally back and forth across the headgasket outline until all of the bolt holes are marked with a number. What you are trying to do is start at the center of the head tightening it down in steps of about 15 foot pounds moving out from the center.

I have built a lot of these engines over the years and they are very forgiving of the head torquing sequence. As long as you start at the center and move out left and right, up and down alternating back and forth, you will have no problems. As a final check once you are done, check the torque on each head bolt to make sure you have not missed one. This does not have to be done in any sequence and you will then be sure that you have it completed properly. Good luck.

Posted on Apr 27, 2010

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Posted on Apr 27, 2010

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Consult a Chilton or a Haynes Auto manual.....look up the year and model....all the info should be there...

Posted on Apr 27, 2010

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350 head torque specs


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Quote:





Originally Posted by norvelplagbao52

1993 saturn sl2 1.9 dohc cylinder head torque
specs and sequence
Cylinder head bolt
tightening procedure:
CYLINDER HEAD BOLT TIGHTENING SEQUENCE:

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SIDE
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In sequence,
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In sequence, turn each bolt an
additional 90 degrees.





Originally Posted by norvelplagbao52

1993 saturn sl2 1.9 dohc cylinder head torque
specs and sequence
Cylinder head bolt
tightening procedure:
CYLINDER HEAD BOLT TIGHTENING SEQUENCE:

INTAKE
SIDE
8 4 1 5 9

7 3 2 6 10
EXHAUST SIDE

In sequence,
torque the cylinder head bolts. Torque: 30 Nm (22 ft-lbs).
In sequence,
torque all bolts. Torque: 50 Nm (37 ft-lbs)
In sequence, turn each bolt an
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5c04c01.jpg


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9fb545e.jpg

Hope this help (remember comment and rated this).

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