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advance spring mechanism inside an automotive distributor

Ask Away! with Jeff Smith: Adjusting Vacuum, Timing & Advance Springs to Cure Engine Misfire

I’ve been reading your posts/blogs/articles on tuning with a vacuum advance and it’s been very helpful. My combo is a 355 small-block Chevy, 10.7:1 compression, 23-degree Brodix 10x heads that […]
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digital display of edelbrock efi system tool

Ask Away! with Jeff Smith: Dialing in Vacuum Advance with an Edelbrock ProFlo-4 EFI

I have a Ford 347 stroked small block with 10:1 compression and a “race cam.” The builder won’t give me cam specifics. I just installed the Edelbrock Pro Flo 4 […]
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close up of a combustion chamber and valves on an engine cylinder head

Ask Away! with Jeff Smith: The Science Behind Low-Compression Engines

I’ve seen a couple of posts where the discussion is about how much compression to run and still use a supercharger. There were lots of ideas kicked around but it […]
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oil carbon deposits on an engine valve

Ask Away! with Jeff Smith: Troubleshooting Valve Train on Small Block Chevy 355

I have a 355 c.i.d. small-block Chevy with a big cam, decent compression, and production iron heads. The cam is an Isky 268/272 at 0.050 with 0.640-inch lift. It has […]
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wilwood clutch and brake pedal assembly

Ask Away! with Jeff Smith: Fixing Spongy Brake Pedal Feel After Transmission Swap

I have a brake bleeding question. We installed a Wilwood four-wheel disc brake system in my ’68 Nova about 15 years ago, and for a couple of years of driving […]
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checking piston travel with a dial gauge

Ask Away! with Jeff Smith: Optimizing Compression in a SBC Corvette Boat Engine

I’m rebuilding a Corvette small block Chevy engine for my cruiser boat in Australia. It’s a mid-range torque engine. I’m using Scat forged, floating pin rods, and a mild Isky […]
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summit racing pro ls piston head

Ask Away! with Jeff Smith: How 2618 vs. 4032 Alloys Affect Forged Piston Noise

I am building an LSA supercharged 6.2L motor. I would prefer to run a 4032 forged piston with a 12cc dish to create the proper compression ratio. I recently watched […]
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chevy 305 tpi v8 small block engine on rolling engine stand in a shop

Ask Away! with Jeff Smith: A Brief History of the Airflow-Restricting Chevy 305

How did Chevrolet build the 305 cubic inch small-block? Is it a mash-up of 283 and 350 parts? Or is it just slightly larger than a 302 Chevy engine? — […]
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king bearing illustration

Ask Away: Explaining Mysterious Rod Bearing Failure

Could I get your opinion on an engine problem? I spun a rod bearing in my supercharged big-block Chevy. The engine makes big power and has run my ’55 Chevy […]
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Supercharged engine

Ask Away! with Jeff Smith: Matching Fuel Pumps, Lines & Injectors for Max Power

I need help understanding EFI high pressure fuel systems. I have researched all over but the answer eludes me. What determines line size? I’m trying to build a Whipple Supercharged […]
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