Torque Spec's for heads??? (AKA HELP)
Thread Starter
Advanced
Joined: Apr 2003
Posts: 91
Likes: 0
From: North Andover MA
Torque Spec's for heads??? (AKA HELP)
Some of you know the story. I pulled the engine to paint it and fix the 1000+ leaks of oil, power steering fluid and other stuff I couldn’t even identify. I broke down over the weekend and took off the heads (wasn't the plan but the while your at it kicked in:banghead: ). My problem is the torque spec’s when I put them back on. Does anything have them? :confused: Also, does the intake manifold also have spec’s? If so what are those? I normally just like to tighten things until they don’t tighten but I feel this may not work for this one.
Help me before I screw somthing up :_dupe:
Help me before I screw somthing up :_dupe:
Le Mans Master
Joined: Feb 1999
Posts: 8,351
Likes: 75
From: Tampa Bay FL
Re: Torque Spec's for heads??? (greenice)
What type of heads have you installed? Stock small block cast iron head torque specs (tighten to these specs in three steps):
30-50-65 ft lbs.
I don't have the tightening sequence handy but do know that you 'start from the center and work outward in a clockwise fashion'. You start at the 'center most' bolt in the middle row of bolts (there are three rows of head bolts on the small block cyl head: 4 in top row, 5 in middle, and 8 in bottom) sitting between the 4-6 and 3-5 cylinder rocker arms.
I'll try to demonstrate:
Top row, sequence of tightening: 13-5-2-10
Middle row, sequence: 17-9-1-6-14
Bottom row, sequence: 16-12-8-4-3-7-11-15
30-50-65 ft lbs.
I don't have the tightening sequence handy but do know that you 'start from the center and work outward in a clockwise fashion'. You start at the 'center most' bolt in the middle row of bolts (there are three rows of head bolts on the small block cyl head: 4 in top row, 5 in middle, and 8 in bottom) sitting between the 4-6 and 3-5 cylinder rocker arms.
I'll try to demonstrate:
Top row, sequence of tightening: 13-5-2-10
Middle row, sequence: 17-9-1-6-14
Bottom row, sequence: 16-12-8-4-3-7-11-15
Thread Starter
Advanced
Joined: Apr 2003
Posts: 91
Likes: 0
From: North Andover MA
Re: Torque Spec's for heads??? (TedH)
Thanks for the information. It will help when I reistall them (when I get new bolts :rolleyes: ) I have a rebuilt SB 350 pushing about 300HP. It has stock heads, nothing fancy on this engine. Just happy to go...
Race Director
Joined: Mar 2001
Posts: 11,322
Likes: 1
From: Living in the Hartland
Re: Torque Spec's for heads??? (greenice)
Here's a link with a diagram:
http://www.worldcastings.com/tech/SportsmanIITech.pdf
It does not reference the the 3 step approach but my trick flow directions do and also other books I have read on eng rebuilding.
For future reference:
www.google.com
I typed in 'small block chevy head bolt sequence'.
[Modified by Fevre, 4:28 PM 11/10/2003]
http://www.worldcastings.com/tech/SportsmanIITech.pdf
It does not reference the the 3 step approach but my trick flow directions do and also other books I have read on eng rebuilding.
For future reference:
www.google.com
I typed in 'small block chevy head bolt sequence'.
[Modified by Fevre, 4:28 PM 11/10/2003]
