Conversions & Swaps LSX Engines in Non-LSX Vehicles
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Brake Booster Question

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Old Aug 16, 2025 | 09:11 PM
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Default Brake Booster Question

Hi Everyone!

I am currently prepping my firewall on my 1966 Chevy II and would like to run a booster on my brakes. I own an L33 engine I intend to put in. I see many people running master cylinders with no boosters on LS engines. Is this because a booster will push the master cylinder too far forward and into the cylinder head? Would something like this work for me? I have Willwood disc brakes on all 4 wheels.


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Old Aug 16, 2025 | 09:18 PM
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I don't see using that setup being an issue. 4th Gen Fbody cars have vacuum brake boosters and there's more room on the driver side to reach all the spark plugs than the passenger side.
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Old Aug 17, 2025 | 02:09 AM
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Moving this to Conversions & Swaps as fitment on a 4th gen F-body is irrelevant when considering fitment on a 2nd gen X-body. The guys in this section should be able to give some advice on early Chevy II/Nova fitment.

Just a side note on why you might not see a traditional booster on some swaps though...some folks will opt for hydroboost rather than a traditional vacuum booster.
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Old Aug 17, 2025 | 04:21 PM
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I've done two 67 Nova's. One with a SBC small cam and one with LS6


with a medium size cam.. Both had C5 brakes all around.
On the red 67 I used a booster with a C5 master.
The black 67 I used a Wilwood manual master.
Wilwood prop valves on both.
Both worked well.
The only real difference is that the manual brakes required a bit more pedal pressure
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