Some more zz4 questions
Thread Starter
Drifting
Joined: Mar 1999
Posts: 1,432
Likes: 22
From: Oxford CT
Some more zz4 questions
I've seen postings on this before, but using forum search can't find anything.
Soo,
1. I have a 71 270 hp, 4 speed car...What size flywheel will I have to get for the zz4?
2. Also, I see that the stock engine has 2 sending units, one in each head. One is for temp, but what is the other for? and which one is which?
Soo,
1. I have a 71 270 hp, 4 speed car...What size flywheel will I have to get for the zz4?
2. Also, I see that the stock engine has 2 sending units, one in each head. One is for temp, but what is the other for? and which one is which?
Drifting
Joined: Jan 2006
Posts: 1,944
Likes: 22
From: Yooperville MI
1. You'll need to determine your present flywheel size before you can buy.
You probably have a 12.75" diameter flywheel and you would need a GM#10105832 for a ZZ4. If you have an 14" dia. flywheel you'll need a GM#14088650.
2. There is a hole in each head for a sending unit because RH & LH heads are the same casting. Typically the wire harness connector is on the LH head, so you'll put a fitting (pipe plug) in the RH head to plug the hole.
You probably have a 12.75" diameter flywheel and you would need a GM#10105832 for a ZZ4. If you have an 14" dia. flywheel you'll need a GM#14088650.
2. There is a hole in each head for a sending unit because RH & LH heads are the same casting. Typically the wire harness connector is on the LH head, so you'll put a fitting (pipe plug) in the RH head to plug the hole.
Thread Starter
Drifting
Joined: Mar 1999
Posts: 1,432
Likes: 22
From: Oxford CT
Is there anyway to determine what size the flywheel is prior to disassembly?
Also, there are leads going to both sending units, so I thought they are both being used for something.
Thanks
Also, there are leads going to both sending units, so I thought they are both being used for something.
Thanks
Race Director
Joined: Sep 2002
Posts: 10,362
Likes: 5
From: San Diego - Deep Within The State of CONFUSION!
Originally Posted by Roadster71
Is there anyway to determine what size the flywheel is prior to disassembly?
Also, there are leads going to both sending units, so I thought they are both being used for something.
Thanks
Also, there are leads going to both sending units, so I thought they are both being used for something.
Thanks
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
Originally Posted by Roadster71
Is there anyway to determine what size the flywheel is prior to disassembly?
Also, there are leads going to both sending units, so I thought they are both being used for something.
Thanks
Also, there are leads going to both sending units, so I thought they are both being used for something.
Thanks
Dive under & pull the bottom tin cover & count the flywheel starter ring gear teeth. Big flywheel 168T, small 153T.
LEADS:
For MY1971 two temp sensors are correct ... one in each head. Don't hold me to it but I think one of them is related to the TCS or TSC (sp?) solenoid that "automatically" adjusts idle at carb / vacuum to dist? ... bolts onto carb base & has some vacuum hoses ... early attempt to lower emissions?
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