Big Block Ford Performance

Get your motor runnin'

Frequently Asked Questions:
In response to questions I receive on a frequent basis, I have addressed various topics below.

Warranty:  All of our complete crate engines are test fired, broken in, and include a 90 day, unlimited mileage warranty.  Warranty does not apply to competition packages or racing use.  Details available upon request.

What's included in a short-block?:  Our short-blocks are essentially a bare block that has been prepped and machined, with cam bearings and a rotating assembly installed. They are equipped as pictured on our home page, and include documentation of all clearances and assembly specs.

What's included in a long-block?:  Our long-blocks start with a complete short-block, and cylinder heads, camshaft, timing set, rockers, and pushrods are installed.  They are equipped as pictured on our home page, and include documentation of all clearances and assembly specs.

What's included in a complete engine?:  Our complete engines are equipped as pictured on our crate engine page.  Intake to oil pan in most cases.  We can also provide ignition systems, fuel systems, etc. as requested, at additional cost.  Full documentation of all clearances and assembly specs is included.

Power ratings: Our engine's power ratings are based on actual dyno testing.  We do not guarantee horsepower ratings because we cannot guarantee how the end user will install or tune his engine.  Choice of carburetor, exhaust, timing, jetting, etc. will all impact the performance of the engine.

Valvesprings: While some manufacturers sell "matched springs" with their camshafts, I feel it's best to measure the installed height, and find a spring to fit vs. trying to make the parts conform to the height of a particular spring.  ALL clearances need to be checked, and even though the springs aren't going to get into coil bind it doesn't mean something else won't.

Pushrods: The only way to determine proper pushrod length is to set everything up on your engine with the parts you plan to use. There are too many variables for anyone to predict what will work.

Valve/Piston clearance: The best way to determine if a particular engine will have sufficiant valve/piston clearance is to actually set it up and measure it. Estimates can be made on prior experience, but there is no guarantee. Pistons can be manufactured with valve pockets that will probably clear most combinations, but as with most things there are too many variables and it's best to physically measure it.

Bearing clearances:  Bearing clearances need to be set based on the application...street, drag race, marine, etc. There is no particular brand of parts that will set up "right" for every combination straight out of the box.  Measuring a starting point and making adjustments via polishing and bearing changes is part of building an engine. Some brands do have more consistent tolerances than others, but none are perfect and all of them need to be checked and set per application.

Dynamic balance: Engines are internal balance design or external balance design. Being an internal balance design does not mean the assembly has been balanced. It's best to balance a rotating assembly with the parts (damper, flex-plate, etc.) that will actually be used.

Compression: Static compression ratio requirements are a function of how the engine will be used, fuel, octane, dynamic compression, cylinder head material, quench, cam timing, manifolds, etc.  There are no hard and fast rules for static compression in relation to pump gas or any other fuel.

Combos: Engines are best when custom tailored for the overall use, needs, and application. Not all engines need aluminum heads or roller cams to make the power that is best for their application. There is no all-around "best head," or "best cam," or "best intake," etc.

Overbore: There is no reason to limit yourself to the smallest overbore possible. What matters is cylinder wall thickness. You can easily have a block at +.030 with thinner cylinder walls than a block at +.080. Determine the overbore required, then sonic check to be sure the cylinder walls will be thick enough.

Journal size: BBF cranks are strong enough and thick enough to handle just about any undersize on the journals. Grinding -.040 will not effect the strength at all. It's not uncommon for stock cranks to be offset ground removing .300" or more and still handle 700+HP.


-All sales on custom/modified parts, and engines are final.  No refunds, returns, or exchanges.
-Returned parts must be in new, unopened, unused condition and must be received within thirty days of sale.
-CarsByCarl inc. reserves the right to apply a fifteen percent restocking fee to any refund, return or exchange. 
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