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Old 05-11-2007, 08:56 PM   #1
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Default head gasket shim

Does anyone know where to get a shim for 90 supra 7mge. I had 20mm shaved off the head and am having problems finding a shim.
Any help is greatly appreciated
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Old 05-16-2007, 03:30 PM   #2
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If I had 20mm shaved off my head I'd have a hard time finding the right gasket too.

I assume you mean .2mm? or .020"?

You have to buy a thicker head gasket to compensate for the shaved head. Many manufacturers sell gaskets in 1.2mm, 1.4mm. 1.6mm, 1.8mm and 2mm sizes. A stock gasket is 1mm.
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Old 05-16-2007, 04:55 PM   #3
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that would be taking MLS headGaskets to the NEXT level..lol
My 1989 toyota supra mods:83.5 mm bore, ARP main studs, ARP rod bolts,rings, Cometic .060" headgasket, ARP head Studs, Ferra 1 mm oversized valves, port work, Rc 550cc injectors, Walbro 255hp
Turbo: 1.15 A/R T4 twin Scroll turbin - journal .60 A/R compressor, Hallman Pro MBC, Turbo XS Blow-off Valve, 50mm wastegate, hks fcd
Intercooler: 32x12x3 core, 3 inch piping, with clampco t-bolt clamps
Exhaust:Exhaust manifold T4 twin scroll,2JZ 3 inch downpipe Fabed up to fit, Mandrell bent 3in back
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Old 01-19-2022, 02:10 AM   #4
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Default Shim gaskets are available from Innovative Machine & Supply

I'm going to resurrect this old question with a brand-new answer. Heads and blocks tend to be over cut and and you need to get back to stock dimensions. Toyota allows a total of 0.010" total removed from stock head and block. If you're not going to use a thicker stacked metal head gasket, you can get a cold rolled steel shim gasket from Innovative Machine & Supply. They are located in Missouri. Their most common on the shelf thickness is 20 thousandths, but you can also order 30, 40, and 60 thousandths by calling them. I put on a 0.020" Shim gasket under a stock Toyota head gasket 8 years and 30K miles ago without issues. For best results you need to have a freshly shaved block and spray the underside of the shim gasket with something like Permatex copper spray. Just the bottom of the shim, not the top where the head gasket will lay. And from experience, you might want to put a little dab of Permatex Black Ultra Silicone around the edges where the main round oil journals drain just before laying the head on and torquing it down. The standard new head thickness is 4.570". It's pretty easy to measure when the head is off with a vernier caliper. The other measurement is a little more difficult because you need to have the engine disassembled to get the measurement from the deck of the block and the saddle point of the main front bearing surface with the bearing out. If you're having your block shaved (and don't forget the front aluminum cover with it), the machine shop can get that number for you by request. The standard deck to saddle point distance is 7.815". You can run the numbers to see what thickness of shim gasket to get. The part number for the 0.020" gasket is HSTO30. Here is a link to their website: https://www.innomach.com/cylinder-head-shims

One way to visually tell if a head has been cut down quite a bit is to look at the bottom of the thermostat standpipe attachment point. When it's new it's rounded, and as the head surface gets cut down repeatedly, it becomes flat. If you're going to purchase a head, keep an eye out for that.
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Last edited by Bru; 01-19-2022 at 02:53 PM.
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