Avoid This Mistake: Creating a Balance Issue with the Wrong Flexplate and Dampener. Offset Misstep. Ford Mustang Restoration Flywheels 01. January 13, 2016. How many of you have rebuilt a 289/302ci small-block, fired it up, and discovered a horrible dashboard chatter from unacceptable engine vibration?

What is the Correct Imbalance Amount for Small-Block Ford Rotating Assemblies? Q: I’m building a 331ci stroker based on a Ford 302 short-block from DSS Racing. The paperwork that came with the short-block said the engine was internally balanced to 28. Ringtone Tv Serial Qubool Hai. 2 oz-in. I know the Ford 302 imbalance is 50 oz-in and the Ford 351 is 28.2 oz-in, so why is my 302-based stroker balanced to 28.2 oz-in?

Should I get a zero-balanced flywheel and harmonic balancer or use the 28.2 oz-in flywheel and harmonic balancer from the 351? I am working with a 1978 Mustang 302 (small-diameter flexplate). I had a local machine shop rebalance the 1978 flexplate for a 1985 302 engine that I want to use so it matches the changed flexplate balance weight Ford switched to. Anyway, either it was balanced incorrectly or something, but it now vibrates a lot. If I take the crank out of the 1978 with the stock vibration dampener and flexplate in place (I fortunately have an untouched spare), and install it in the 1985 as is, I am of the opinion it will run smooth.

Am I correct? Milton Fogg San Diego, CA A: On an externally balanced small-block Ford, both the flywheel/flexplate and the balancer must have the correct amount of imbalance for the particular crankshaft being used.

Failure to use a flywheel/flexplate and balancer combination with the correct amount of external imbalance will result in serious engine damage. Prior to 1981, production 302s used a 28.2 oz-in imbalance factor. Canon Clc5151 64 Bit Driver.

The 1981-and-later production 302 engines, the current Ford Racing 302-based crate engines, and all the late, unlamented 255ci engines have lightweight cranks that require the 50 oz-in imbalance factor. (Caution: There are reports that some rebuilt, remanufactured “service-replacement” 302 engines intended for 1980-and-earlier models—even some sold through Ford Service—were rebuilt using lightweight cranks, which would require a 50 oz-in flywheel and damper.) The majority of aftermarket performance stroker cranks are set up for the 28.2 oz-in imbalance factor or (on the high end) may be fully internally balanced. Generally, hot rodders prefer less (or none at all) external balance, believing this may enhance high-rpm durability. The downside is that a fully neutral-balanced, increased-stroke crankshaft may require adding expensive Mallory heavy-metal slugs to achieve proper balance.

Thomas, considering your situation first, what the paperwork means is that your nonstock aftermarket stroker crank was balanced for a flywheel/harmonic balancer combination with a 28.2 oz-in external imbalance. In other words, don’t use a neutral-balance flywheel/balancer combo or one with the “wrong” 50 oz-in imbalance with your rotating assembly. For a 28.2 oz-in imbalance application, in theory one can use any 221, 260, 289, 351C, 351W, or 1968–1980 302 flywheel or flexplate (but not one intended for a production 1981–2001 302). That’s “in theory” because there were 148- (extremely rare, like the flexplate used on Milton’s 1978 Mustang II 302), 157-, and 164-tooth units available. The flywheel/flexplate, bellhousing, and starter nose must be a matched combination. Additionally, a manual-trans flywheel must have the correct bolt pattern for your style of clutch, while an auto trans flexplate must have the correct torque-converter bolt pattern.