5.7 vortec harmonic balancer size ?

[CRF450R]

So I just installed my new rebuilt 5.7 vortec and soon realized when I went to bring the #1 cylinder up to tdc I noticed the balancer is massive compared to the balancer on my old 5.7 I just out. The guy was building the motor to swap into his 98 with a big ugly lift and big goofy tires. So the motor is cammed and few other odds and ends done to it but I thought the smaller balancer would yeild the most low end or am I wrong? Is having this bigger balancer a good or a bad thing?

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[b454rat]

the diameter of the balancer is too small to make a difference in power/torque. Check summtracing.com, they will list diameter size for different balancers. I remember 25 years ago seeing ads for a weighted flywheel for lifted trucks, that would give you more torque. Now can't find em…..

 

[b454rat]

Just checking, but are you sure it's a 350 n not a 305?

 

[Pinger]

The balancer on my 350 is about the size of the one in the second photo - about 1'' bigger in diameter than the pulley. The one in the first photo - is it missing its outer ring?

The sizing of a balancer should be determined by physical aspects of the crankshaft that dictate its torsional resonance frequency. Very complicated stuff!

 

[CRF450R]

Just checking, but are you sure it's a 350 n not a 305?

I'll have to clean about five inches of sludge of the motor to check. The last owner did say he had too swap the motor and said he put another used 5.7 back in but maby it was a 305 and he didn't know it.

 

[CRF450R]

Well I'll be dammed it was a 5.0 the previous owner took out the 5.7 when his wife blew a cooler line and swapped in a 5.0. I texted the last owner and he houstly thought he had bought a 5.7 he did say it seemed a bit under powered compared to the last motor this explains it. Dam this entire time I thought it was a 5.7 cause the vin says it's supposed to be but its back to being a 5.7 now. All that talk I did telling everyone how much I hate this gutless gas guzzling POS 5.7 vortec to find

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out now it was a 305 lol woops.

 

[letitsnow]

Nice! At least it now makes sense.

I predict you will REALLY like your new motor!!

 

[alpinecrick]

Just checking, but are you sure it's a 350 n not a 305?

Good call........

 

[CRF450R]

Nice! At least it now makes sense.

I predict you will REALLY like your new motor!!

I was hoping I could here it run today but ran into a problem. The guy that had the motor built was going to carb it and I didn't notice and he forgot to tell me it has a metal timing chain cover so there is no place for the dam crank sensor. My question now is do I have to replace the oil pan gasket on this new motor when I put the new timing cover on? This motor has not had any fluids in it yet.

 

[alpinecrick]

You should be able to drop the pan down without messing up the gasket.

I have the Holley aluminum timing chain cover for the Vortecs on my 96 and it hasn't leaked......yet.

But I did have to shim out my sensor to get it to pick up the reluctor.