OK,been a few years since I swapped heads on my car I just wanted to double check before I torque the new heads down.Is this the correct sequence? I am using ARP head bolts and they say to torque the bolts in 3 steps to a maximum 70 ft lbs. I thought I torqued them in a different pattern though.
That sequence is not correct https://www.teambuick.com/reference/library/71_chassis/files/60-b.php figure 60.75
Sequence in op is same as on Team Buick and another site I came across. I was taught to start from the middle and work out to the ends in lieu of a OE sequence. The sequence shown in the TA catalogue for their heads and the edelbrock sequence follow this logic ( although slightly different ). I'm interested to hear our experienced Buick engine guru's chime in on how they do it on our iron heads.
I got that sequence from Team Buick as well... I start in the middle in the head then like Ethan said go to the outside like this..
As Dave said above, the head bolt torque sequence show in Pat's original post conflicts with all the 1968-1971 Buick Service Manuals as well as Service Technical Bulletin that I've attached, dated February 1970. The wording in the attached Service Bulletin clarifies that (1) the picture shows a 350 V8 head but (2) the torque sequence is the same for both 350 and 455 motors. The wording in the Service Manuals isn't as clearly stated. -mike
For aluminum heads, http://taperformance.com/PDF/Head_Instructions.pdf Torque table, http://taperformance.com/PDF/Torque_Specification.pdf 100 ft. lbs.