I replaced the heads on a 350cid chevy 4 barrel Heavy Head. This was
originally a blue crate motor. It is installed in a '67 4x4 1/2 ton
shortbed. I used Fel-Pro Metal faced gaskets with a very light coat of
copper sealer as Fel-Pro suggested. I torqued all heads to 65 pounds. I
would like to know if I will need to go back and retorque them later after
say 500 miles or so. The paper that came with the gasket kit is silent on
this. Is it a good practice to retorque all heads. Or is this done only on
compsition gaskets.and not metal. Any and all advice will be appreciated.
On Sun, 17 Sep 2006 01:20:56 -0700, "Will" <coredump4(-at-)yahoo.com>
There is no harm at all in retorquing heads. I do it all the time on
rebuilds regardless of gasket type. Cheap insurance costing you only
some time. Just do it when engine is cold.
Actually I had a car that required it or warranty was void. It was
free. WHile you may have a point, it is cheap insurance and when
dealing with used parts it is a wise idea.
Yes and also with a aluminum head it is basically a must do on a
rebluid if you want maximum possible headgasket life. Also with a
luminum head it deos not hurt to recheck them again after several
thousand miles. If they are found to be okay still than do not bother
further but if they are a bit loose you should check them again after
several thousand more miles. Aluminum has a different expansion rate
than cast iron engine block and can sometimes loosen a bit with time.
Not I am not because the torque values are below the point at which
bolt steel will yeild. SOmetimes afe a few heat/cool cycles, the
gaskets settle a bit and require retorquing. It is better to be safe
No, SnoMan is not correct, and neither are you! Whether or not you
retorque the head bolts on these engines (by the way, which 4 cylinder
engine/which year/etc) will have nothing to do with why the head gaskets
fail on these engines. Obviously, you haven't had many (if any) of these
yield point as they are tightened. These bolts are commonly used where exact
clamping loads are required on parts. You may find them used to hold cylinder
heads, connecting rods, crankshaft main bearing caps, flywheels and front engine
dampers. When a shop manual indicates that a bolt is to be discarded and new
ones used, they are almost always torque-to yield bolts.
time. After all, the old bolts still look good, but looks can be deceiving.
Reusing the old bolts can cause expensive engine failure. During the tightening
process, the bolts have been pulled to their elastic limit. The bolts actually
stretch. Only new bolts can provide the even clamping force needed on today's
wow dave is so right, NO you never retorque any head bolt it is a very
small minded person who thinks that is a way that a head gasket goes bad
the cavs have alum heads and a very high tech gasket to try and seal them
it is not head bolt retorqueing that makes them loose there seal
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