PRO/RACE PERFORMANCE PRODUCTS DAMPER 8.0" FOR SBC CHEVY 400 406 ENGINES.

EXTERNALLY BALANCED.

PRO/STREET SERIES

Pro Street Series, made by Pro Race Performance Products. Non S.F.I. Externally balanced, (weighted) or can be used for internal setups by removing weight.

8.0 INCH DIAMETER.

Lifetime Warranty, Unlimited Mileage, Street or Strip Use.

PRO/STREET Harmonic Dampers feature:

• Nodular Iron Construction - Most cast dampers are manufactured from gray iron castings. Nodular iron is over 30% stronger than gray iron.
• Bonded Elastomer - Outer ring and inner hub are bonded (vulcanized) to the elastomer. This minimizes the potential for the outer ring to move on the hub, losing true TDC position.
• Removable Counterweights – Externally balanced models feature bolt-in counterweights, making it easy to switch from an externally balanced engine to an internally balanced engine.
• Precision Balanced - Dampers are machined and precision balanced.
• 60o of permanent easy to read timing marks.

While PRO/STREET dampers are not intended for racing, the fact that they are cast of nodular iron, as opposed to ordinary gray iron, means that they are suitable for higher rpms than most competitive models.

The PRO/STREET Nodular Iron Harmonic Dampers are NOT SFI certified. However to prove the integrity of the PRO/STREET dampers, we had the SFI test lab run some spin tests. The PRO/STREET damper was subjected to 8,000 rpm for one hour, and then 12,500 rpm for 15 minutes with no sign of degradation!

This by no means suggests the PRO/STREET damper should be used in extreme applications. Use PRO/RACE or PRO/SPORT for high performance applications.

Note from Skip White

We have seen others market a knockoff, no name damper that has to be the worst product on the market. We have nothing against knockoff products, but some are worth warning about. These low quality dampers being sold by many have a poor appearance and the center hole is often out of spec, with a dull finish. The casting was not machine finished; it was rough cast, as you would see on an engine block.

What concerned us more than anything is knowing that the design of an elastomer style damper is very critical to how well the material is bonded between the inner and outer ring. This must be able to withstand the constant oscillation and heat for many years. The elastomer must be made of a material that won't dry out any time soon.

One more very important aspect of this material is its Durometer rating. The Durometer rating, or resilience, is very important, as it should be in tune with the crank harmonics or it will not be able to do its job properly. Knowing how much pride the Pro Race company takes in everything they make, we are confident this factor has been addressed. They offer a full line of dampers, as well as many that are SFI rated.

When we're standing over an engine to set the timing, we usually have to rev the engine up to around 4000 rpm or more to make sure we get a total timing reading, as most distributors have very resistant springs in them. I would not want to think that I sold a damper that could develop a fracture or already have one in it, and know that this could break under high rpm, and whoever is standing above it would be at risk of death or serious injury.

As we mentioned, stay away from the no name, or ultra low cost dampers. A final note: get rid of that tired old damper on your engine. The elastomer ring is more than dried out, and is most likely not dampening the damaging crank harmonics. This can lead to fractures in the crankshaft. It is claimed that dampers that are not doing their job can cost horsepower. This is most likely due to the fact that the crank harmonics are not being dampened, and create a drag in the engine.

Skip White

Bonded elastomer

Unlike many OE dampers, or other replacement style dampers, the PRO/STREET range features a bonded elastomer! The elastomer is injected at high temperature and under extreme pressure. In fact, during the manufacturing process, EACH AND EVERY PRO/STREET damper is subjected to elastomer bond test of 3000 lbs (2000 lbs on 24262) separation force. If there is any sign of bond degradation then the damper is scrapped. Many OEM dampers aren't bonded at all.

Removable Counterweights

Harmonic dampers are supplied in two styles; those for internally balanced engines and those for externally balanced engines. Externally balanced engines have a counterweight bolted into the hub of the damper. The advantage of having a removable counterweight in the hub eliminates the possibility of having the counterweight mass move from its position, plus it provides an extremely accurate external balance mass.

The PRO/STREET Damper for internally and externally balanced small block and big block Chevys and for small block Chryslers is identical except for the counterweight. This means, for example, if you have a PRO/STREET Damper for a 400 small block Chevy, you can remove the counterweight and the damper will work perfectly for a 350 Chevy. Conversely, if you have a 350 Damper and want to use it on a 400, you can now purchase the proper PRO/RACE counterweight and bolt it into your 350 damper and it is now a 400 damper.

Machined to tolerances exceeding OEM specifications!

The PRO/STREET dampers have been machined to tolerances far exceeding those used by OEMs. Just take a look at the overall surface finish and oil seal and bore of the damper! Permanent rolled-in timing marks are very visible and will never fade or become less visible!

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