Greg in SC
Member
I am replacing the head gasket using a Felpro 7277 on my 8N. I have the torque sequence for the head but do you normally use new bolts? All mine are bolts, not studs. Thanks.
(quoted from post at 15:49:55 07/13/14) I just recently swapped an 8N head gasket.
Clean very well with a brush and some wd40 worked
well. In fact make sure to clean all of both
surfaces (bottom of head, top of engine block)
very well.
Sealer on the bolts can"t hurt, but it"s not a
requirement, I didn"t end up adding anything when
bolting down the head.
As a side note, I was suspect about running the
engine and needed to re-tighten the bolts (my hood
is a big pain to get off, and remember it"s heavy
with the gas tank), however I would highly
recommend doing it, it turns out the tensions
changed somewhat significantly.
(quoted from post at 17:33:54 07/13/14) The local machine shop here charges $40 per hour so
it wouldn't cost to much to have it milled. I use to
use #3 permatex brush on sealer.
Is your 8N a front or side mount distributor?
(quoted from post at 02:45:59 07/14/14) My impression is that heads get resurfaced far more often than is
necessary when inexperienced mechanics put a straight edge on
the bare head and get all alarmed that they are not perfectly flat.
But a flat head is not anywhere near as rigid as an OHV head so a
little distortion in inevitable when the head is not torqued down.
The life of a head is measured pretty much by how many times it
gets cut. . Why use it up unecessarily?
I seem to recall that Zane (who is considerably more creditable
that me) has made a similar point.
(quoted from post at 16:51:20 07/14/14) .009 out of plane is one of the benchmarks calling for a resurfacing . . . at least on a thick OHV head.
Don't use any sealant on the gasket.
Felpro make great gaskets; Their motto used to be:
"where sealing is a science."
Some gasket including Felpro Perma Torque advertise that a retorque isn't necessary. While that may be so of Felpro ONLY, I wouldn't trust any other outfit's no retorque claim and have always ignored that regardless of the maker.
The reasoning behind clean threads lightly oiled as someone mentioned, is to keep your torque readings true. Felpro Grey Bolt Prep (GRA2) for any bolts extending into the water jacket.
If you did the rings too, then don't be letting your engine just idle before a proper run-in under load to seat the rings. Excessive idling can "polish up the cylinder walls, cause incomplete combustion and carbon up the valves".
Here's a good tutorial on installing head gaskets .
http://aftermarket.federalmogul.com/en-US/Technical/Documents/How%20To%20Prevent%20Head%20Gasket%20Failure%20-%20Low%20Clamping%20Force.pdf
(quoted from post at 16:26:43 07/30/14)
You are passing up a nice upgrade... Its not hard to drill and tap it... You will not regret it...
On a side note if your fel-pro gasket is blue no sealer needed its pre coated with it from the factory.... I would slop some on the head bolt threads. :wink:
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