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Old 11-10-2020, 05:06 PM   #1
doleary
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Default B230f mls head gasket thickness question

Have a 84 242 with a 92 b230f block h beams and forged pistons, going 16v head and hx35, pistons are stick out of block 15 thou, anyone have recommendation for head gasket thickness? . I would say I want to go for conservative boost but most likely end up turning it up way to much. Any advice would be greatly appreciated. Thanks in advance, Dan.
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Old 11-10-2020, 09:35 PM   #2
klr142
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You can use a stock headgasket with the pistons sticking out that much and it'll be perfect. Stock gaskets should be .047" thick which gives you .032" piston-head clearance. That'll be great for spinning up to 8000rpm if you'd like. You would also get the benefit of using the stock gasket as a fuse in case something goes wrong.

If you really want a Cometic, the .045" or .050" would be safe and still get you into a good quench clearance between the head and pistons.
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Old 11-10-2020, 10:51 PM   #3
doleary
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Thanks for the info man, I had been playing back and forth with the idea of going with a stock one as this is the first time I'll be tuning with megasquirt I will probably blow my engine up lol but we will see !! Thanks, Dan.
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Old 11-11-2020, 01:51 AM   #4
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You’re very welcome! Basically, the goal is between .030-.040” clearance between the pistons and the head when they’re all the way up. Or, .8-1mm. If you aren’t revving past 6k you can likely get away with tighter, but the main benefit is already there when you’re at less than .040” gap.
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Old 11-11-2020, 08:05 PM   #5
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Revving to 8k sounds fun =), and you sound like you really know what your talking about, thanks again !!
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Old 11-11-2020, 08:17 PM   #6
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Happy to help!
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