LT1 Head Gasket Question - LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums
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post #1 of 5 (permalink) Old 04-30-2017, 01:23 PM Thread Starter
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LT1 Head Gasket Question

Hey everyone, currently rebuilding my 1996 LT1 and I'm really confused right now on the head installation process, when I pulled the original heads they did NOT have washers on the head bolts and I bought a new set of head bolts from Fel Pro to use, are they supposed to have washers underneath the bolts? Also my local auto parts stores don't even have a listing for head bolt washers under that year. I know ARP bolts come with washers but what about just regular stock ones?

1996 Z28 Camaro #823, Rebuilt With All Upgrades M6, LT1, Subframe Connectors, SLP Exhaust, Ram Air Intake, K&N Filter, No Cats, MSD Wires, NGK Spark Plugs
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post #2 of 5 (permalink) Old 05-01-2017, 06:45 AM
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GM uses bolts in many places that have a flange built in to bolt head. These bolts are used without washers from the factory. I guess if it makes you feel better, you could use washers on the head bolts.

Just make sure you use washers that can stand up to the pressure being exerted on them. In other words, high grade washers.
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post #3 of 5 (permalink) Old 05-01-2017, 08:36 AM
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Originally Posted by Pashendale149 View Post
I bought a new set of head bolts from Fel Pro to use
Return them and get ARP.

1995 LT1 Wagon. ERE 383
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post #4 of 5 (permalink) Old 05-02-2017, 01:15 AM
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As Coco mentioned if they are flange bolts then they do not require a washer as the clamping surface is already as wide as a washer. Are you doing a very basic build and wanting a TTY bolt for a particular reason other than cost?

1996 Pontiac Firebird, 396 ltx, 24x, forged eagle crank, 6" compstar rods, 5cc forged pistons, LE custom billet 263/271 .688/.688 108 LSA, LE ported AFRs, Pacesetter LTs, 200hp Nirtous Outlet plate, 4L80E, Moser 9" w/4.30 & trutrac
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post #5 of 5 (permalink) Old 05-02-2017, 10:07 AM
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Aluminum heads should always use washers under the bolt heads. Cast iron heads are ok without washers, but still require the "washer face" type bolt heads described above.
If no washers are used on Al heads from GM, their torquing procedure had to accommodate the added friction/galling of the bolt head into the aluminum. Don't try that on a rebuild.

1996 ImpalaSS
Stock bottom LT1, Advanced Induction HR cam & ported GM heads
10.98 @ 122 NA
10.35 @ 128 on the 100 shot

Last edited by bowtienut; 05-02-2017 at 10:10 AM.
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