Answer
Apr 23, 2025 - 03:29 PM
Yes, the 28 oz Pro Street balancer will work on a 351W. That in conjunction with either Drivens pulley or our pulley # 2502, should get you lined up with the explorer dress.
Will this work on a 1987 351W. I am converting it using 2001 Explorer Parts. Pro Street Harmonic Damper, 28 or 50 oz, SBF V8, 66-77 Ford Bronco
https://classicbroncos.com/tech/explo...
5.0 versus 302/351 differences. One issue that comes up early in the conversion is the fact that the lower crankshaft pulley on the Explorer 5.0 is integrated with the crank balancer. Although the 302/5.0 small block engines are the same displacement, the thing that is different (other than firing order and a few other details) is the balance. Pre-1981 302s and all 351Ws use a 28 oz. external balance, and 1981-up 5.0s use a 50 oz external balance; this means they use different harmonic balancers and different flywheels. Late model engines can simply bolt on the Explorer balancer because the Explorer engine is a “5.0”. But what do you do if you have an earlier small block, a “302” or a 351? To adapt the Explorer crank pulley/balancer to a 28 oz. engine you can do one of four things: (1) have a machine shop rebalance your existing Explorer balancer, (2) you can go to www.damperdudes.net, which does an excellent job, and for $115 total will rebuild, rebalance, and ship your balancer in about a weeks time, (3) if you are doing a build on an engine you could have your crankshaft and flywheel re-balanced to 50 oz external balance, or (4) call Randy at www.drivenautoparts.com who has an adapter pulley to bolt on to your existing 28 oz. 3 bolt balancer. His pulley is right at $75 (at this writing) and is a very nice piece.
5.0 versus 302/351 differences. One issue that comes up early in the conversion is the fact that the lower crankshaft pulley on the Explorer 5.0 is integrated with the crank balancer. Although the 302/5.0 small block engines are the same displacement, the thing that is different (other than firing order and a few other details) is the balance. Pre-1981 302s and all 351Ws use a 28 oz. external balance, and 1981-up 5.0s use a 50 oz external balance; this means they use different harmonic balancers and different flywheels. Late model engines can simply bolt on the Explorer balancer because the Explorer engine is a “5.0”. But what do you do if you have an earlier small block, a “302” or a 351? To adapt the Explorer crank pulley/balancer to a 28 oz. engine you can do one of four things: (1) have a machine shop rebalance your existing Explorer balancer, (2) you can go to www.damperdudes.net, which does an excellent job, and for $115 total will rebuild, rebalance, and ship your balancer in about a weeks time, (3) if you are doing a build on an engine you could have your crankshaft and flywheel re-balanced to 50 oz external balance, or (4) call Randy at www.drivenautoparts.com who has an adapter pulley to bolt on to your existing 28 oz. 3 bolt balancer. His pulley is right at $75 (at this writing) and is a very nice piece.
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Open Apr 30, 2025 - 05:03 PM
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Pro Street Harmonic Damper, 28 or 50 oz, SBF V8, 66-77 Ford Bronco
Pro Street Harmonic Balancer | 28 oz or 50 oz Options | SBF 289 302 351W This Pro Street Harmonic Balancer is built for serious performance and flexibility, making it an ideal choice for Small Block Ford (SBF) engines including the 289, 302, and 351W. Offered in either 28 oz or 50 oz imbalance, this...
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