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Flywheel Help!!!

 
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jtb0322
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PostPosted: Sat Mar 03, 2012 2:24 pm    Post subject: Flywheel Help!!! Reply with quote

Hey guys I need a little help. I am getting ready to buy the aluminum flywheel and I'm a little bit confused? I have a machine shop built 305 that was also balanced. I am confused about the internal/external flywheels and what I need to buy. This is a 1-piece rear main seal engine. Can someone please straighten me up on what I need to buy?
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Big Dave
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PostPosted: Sat Mar 03, 2012 3:57 pm    Post subject: Reply with quote

the 307 was internally balanced. Only the SBC 400 was externally balanced (defined by having weights added or subtracted from the balancer and flywheel). The 350 two piece crank had an external weight but it was part of the crankshaft and used the same neutral balanced flywheel as all other engines.

Big Dave
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clay
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1972 Chevrolet Nova

PostPosted: Sat Mar 03, 2012 8:07 pm    Post subject: Reply with quote

Normally a one piece seal crank requires a flexplate or flywheel that has a counterweight on it. The damper is neutral however and doesn't have any type of counterweight. However since your assembly has been balanced double check with the machine shop to see what you need. If you have a lighter piston / rod combo than stock your machine shop might have been able to internally balance it. No way to know for sure without calling them first. Clay
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af2
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1933 Willys Coupe

PostPosted: Sat Mar 03, 2012 10:48 pm    Post subject: Reply with quote

clay wrote:
Normally a one piece seal crank requires a flexplate or flywheel that has a counterweight on it. The damper is neutral however and doesn't have any type of counterweight. However since your assembly has been balanced double check with the machine shop to see what you need. If you have a lighter piston / rod combo than stock your machine shop might have been able to internally balance it. No way to know for sure without calling them first. Clay


X2 on that is major!! You need to know if it was balanced with a neutral "0" balance flywheel.
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Big Dave
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PostPosted: Sun Mar 04, 2012 11:32 am    Post subject: Reply with quote

Mybad!

Was thinking 307 which used the 327 crank instead of the 305 which used the 350 crank. As I said the 350 was externally balanced. On the two piece rear main seal cranks that was acomplished by an overly large rectangular flange on the flywheel mating surface. On a one piece 350 crank (there were no one piece 400 cranks made by GM) they used a weight on the flexplate like Clay said.

Sorry for the confusion (I'm blaming it on my meds).

Big Dave
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jtb0322
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PostPosted: Thu Mar 08, 2012 10:41 pm    Post subject: Reply with quote

I have a quick question. I am looking for a .015" compressed head gasket for a .030" over 305. I found a fel-pro gasket but it has a 4.1" bore. Is this safe to use? If not, what thin gasket can I use?

Thanks guys!!
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af2
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1933 Willys Coupe

PostPosted: Thu Mar 08, 2012 11:53 pm    Post subject: Reply with quote

jtb0322 wrote:
I have a quick question. I am looking for a .015" compressed head gasket for a .030" over 305. I found a fel-pro gasket but it has a 4.1" bore. Is this safe to use? If not, what thin gasket can I use?

Thanks guys!!


That is all you are going to find and will work fine! Look at MR gasket also.
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jtb0322
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PostPosted: Fri Mar 09, 2012 12:11 am    Post subject: Reply with quote

So a 4.1" bore head gasket will work just fine for a 3.766" bore performance 305 engine? I just want to make sure I understand correctly.
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af2
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1933 Willys Coupe

PostPosted: Fri Mar 09, 2012 1:51 pm    Post subject: Reply with quote

jtb0322 wrote:
So a 4.1" bore head gasket will work just fine for a 3.766" bore performance 305 engine? I just want to make sure I understand correctly.


Yes it will and you don't have any other options.
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jtb0322
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PostPosted: Mon Mar 12, 2012 10:15 pm    Post subject: Reply with quote

Ok so first of all thanks for all the help guys! I found out that the motor is internally balanced from the shop and I now need to find a lightweight flywheel. Does anyone know where I can get a internally balanced 10-12lb flywheel for a 1 piece rear main seal? I can't seem to find one anywhere?

Thanks!
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af2
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1933 Willys Coupe

PostPosted: Mon Mar 12, 2012 10:34 pm    Post subject: Reply with quote

Here is one and there is more.

http://www.summitracing.com/parts/FIZ-198551/
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clay
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PostPosted: Mon Mar 12, 2012 10:53 pm    Post subject: Reply with quote

Here are some billet steel ones. I found an aluminum one on e-bay but it was heavier (14 lbs.) and not sure if it was one piece seal. The third one down looks like it is for a one piece seal and weighs 12 lbs. I'm more of an automatic guy so I'm in sort of new territory for me here but this looks like what you are looking for. Clay

http://www.dansracingsupply.com/contents/en-us/d376_RAM_BILLET_STEEL_FLYWHEELS.html

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jtb0322
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PostPosted: Sun Mar 18, 2012 12:14 pm    Post subject: Reply with quote

Can I use a spring hub clutch disk with this flywheel? Please help! I need to get this ordered asap.

http://www.summitracing.com/parts/FIZ-198531/Warnings/?prefilter=1

Thanks guys!
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af2
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1933 Willys Coupe

PostPosted: Sun Mar 18, 2012 9:07 pm    Post subject: Reply with quote

jtb0322 wrote:
Can I use a spring hub clutch disk with this flywheel? Please help! I need to get this ordered asap.

http://www.summitracing.com/parts/FIZ-198531/Warnings/?prefilter=1

Thanks guys!


#1 you need to measure the depth and circumference of the springs to the flywheel.

#2 You need to call Summit on a week day and have them measure the fly wheel depth and circumference at the point beyond the bolt pattern and springs so you can compare. Minus 3/8" for bolt height.

#3 if confused PM me and I will get you in touch with a guy in the Sparks store that will help.

#4 Do Not be a know it all when talking to him because he will call me and bitch slap me for sending him a ?????? Shocked
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