Do i need MLS gaskets for 5-8lbs of boost - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-29-2013, 07:22 PM
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Do i need MLS gaskets for 5-8lbs of boost

It is going on a bbc 427. Only a drag car and have around 8.7 compression. I know its extra insurance to have them but do i really need them and how about 8-10 lbs of boostthxs

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Old 09-29-2013, 07:37 PM
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Quote:
Originally Posted by menoaz View Post
It is going on a bbc 427. Only a drag car and have around 8.7 compression. I know its extra insurance to have them but do i really need them and how about 8-10 lbs of boostthxs
I don't think any of us can advise you on this. We have no idea of the integrity of the block or heads, surface finish, fasteners you will use, torque you will apply, propensity to spark knock, quality of fuel used, etc., etc.

Personally, I think you're a little too aggressive on the boost if your SCR is 8.7:1. Take a look at this tech chart from Blower Drive Service. Read boost across the top and SCR down the left side. You can see that they recommend 6 psi max for use with pump gas at 8.5:1 SCR.
https://www.blowerdriveservice.com/t...al-charts.html
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Old 09-29-2013, 09:07 PM
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Drag only car, likely he's running racing fuel of some kind. 10psi may be low.
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Old 09-30-2013, 09:24 PM
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Thxs inspector, just gonna go with the JE mls gaskets to be safe.
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Old 09-30-2013, 09:59 PM
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The head gasket is a "Fuse" If you blow the head gasket it tells you you exceeded the laws of physics.

Boost does not blow head gaskets. But detonation and crappy low octane fuel does.

Use better gas and or less spark advance under boost and you won't blow that fuse again. If you make the head gaskets bullet proof, the next fuse is the $$$ pistons $$$...

Which would you rather get a warning from?
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Old 10-01-2013, 11:34 AM
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Not necessary . I run 6-9 psi on my vehicles that are forced induction. My c10 is supercharged, and is holding up well ( 1.5 years) with cast pistons and stock gmp gaskets. At 9.0 compression ratio with vortec heads, a performer edelbrock cam, MSD ignition with BTM, it is safe. Makes great power for a daily driver truck.

I would think a good wideband, or some O2 sensor air fuel tuning device, is most important when setting it up. It helped me work the kinks out in a hurry.
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