Chevy Small Block Flywheels

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[ARCHIVED THREAD] - Chevy Small Block Flywheels

Posted: 1/5/2006 7:06:26 PM EDT

Are they steel, or cast iron?

edit: factory original. I know you can get aluminum or other fancy ones.

Posted: 1/5/2006 7:12:27 PM EDT

[#1]

Some were cast, m-21,m-22 used a steel unit for the most part. I don't have the part number reference anymore. They both were good for most non-race applications and under 7,000 rpm. the best insurance is to run a steel bellhousing...... I'm a big-block Mopar freak but I've had many small block chev's. What are you doing to that mouse motor?

Posted: 1/5/2006 7:12:53 PM EDT

[#2]

I can't imagine them being iron

Posted: 1/5/2006 7:14:38 PM EDT

[#3]

Stay away from the aluminum wheels - Small block general need a little flywheel ineritia to help them keep turning. Also aluminum flywheels are generalyy not-safe.......

Quoted:
Are they steel, or cast iron?

edit: factory original. I know you can get aluminum or other fancy ones.

Posted: 1/5/2006 7:16:21 PM EDT

[#4]

Quoted:
Some were cast, m-21,m-22 used a steel unit for the most part. I don't have the part number reference anymore. They both were good for most non-race applications and under 7,000 rpm. the best insurance is to run a steel bellhousing...... I'm a big-block Mopar freak but I've had many small block chev's. What are you doing to that mouse motor?

Actually, I built a 450HP 383 a few years ago.
And my memory was fading regarding what the flywheels were made of.

However, my question wasn't regarding performance.
I just knew there would be a car guy with a better memory then me.

A buddy emailed saying he was taking his 50-bmg to the range this weekend,
and a flywheel from a 350 to use as a target.

I couldn't remember if they were cast iron, or steel.
Which would determine what to expect when it got hit by a bullet.
Two shots to cast iron would likely crack it in half.

Posted: 1/5/2006 7:20:52 PM EDT

[#5]

They are almost all cast.

I have probably changed that big gear on them 100+ times.

It should shatter rather nicely!

Posted: 1/5/2006 7:26:37 PM EDT

[#6]

Your 383 was probably externally ballanced.. Was it a 4-speed?. Most auto tranny cars had a torqe converter that was ballanced to the 400 crank. Never saw a stick-shift combo If so where did you get the flywheel for a "400" crankshaft? Neat combo - just curious.....

Posted: 1/5/2006 7:31:00 PM EDT

[#7]

Quoted:
Your 383 was probably externally ballanced.. Was it a 4-speed?. Most auto tranny cars had a torqe converter that was ballanced to the 400 crank. Never saw a stick-shift combo If so where did you get the flywheel for a "400" crankshaft? Neat combo - just curious.....

I bought a crank that would allow me to use a stock 350 flywheel.
It cost a bit more than a 400 crank, but not as much as the extra cost of the flywheel.

Edit: I am using Richmond 6-speed overdrive. 4-speeds aren't enough speeds for me.
(although with the 3.55 posi, the only time it was ever in 6th was well over 130mph)

Posted: 1/5/2006 7:33:54 PM EDT

[#8]

Most were nodular cast iron. Z28's used one that was 12lbs or something like that.

rj

Posted: 1/5/2006 7:47:08 PM EDT

[#9]

I built a383 in 1981 and stuck it in a 1980 el camino with a turbo 400 tranny the car only had 4,000 miles on it when I made the swap. A real tire fryer. Interesting enough the car originally had a 305 with a 4-speed from the factory. A real weird combo. Tried to use the 4-speed set-up but had trouble ballancing the flywheel to the 400 crank. So it was automatic and a real loose converter. No brakes and no handling but it ran some high 13's @ 105 1/4 times. I pulled a 20' boat and trailer with it and could boil the tires at 40 m.p.h.. Just one of many cars that have left me broke and hopeless...

Posted: 1/5/2006 7:55:31 PM EDT

[#10]

I've pulled maybe 5 or 6 out from behind small blocks, all were in pickups except for one Monte Carlo. 305's, 350's and 400's, all had iron/steel flywheels. The only special one is the 400, it's externally balanced, along with the harmonic balancer.

Posted: 1/5/2006 8:13:09 PM EDT

[#11]

10-4 on the ballancer, The 400 was a mess when it came to ballancing. but worth the effort in torque and tire frying ability...............

[ARCHIVED THREAD] - Chevy Small Block Flywheels

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