C-4 swap to 90 motor

R

Racer02

New Member

Aug 1, 2005

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Oct 28, 2006

#1

• Oct 28, 2006

• #1

I'm not the consummate ford guy here, even though thats all I own! Need some help om a project...I am installing a 1990 mustang motor into a 78 cobra. I have the smaller bell housing already, and a smaller flex plate, but not sure if the earlier plate fromthe original motor will throw the balance off on the 90 motor. Any thoughts would be REALLY appreciated! I know there have been a ton of C-4 swaps done but finding someone to ask doesnt happen that easily at the end of October- everybody is sleeping for the winter! Thanks!!!

 

mattmcdan

Member

Apr 19, 2006

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Okeechobee, Florida

Oct 28, 2006

#2

• Oct 28, 2006

• #2

Just be sure to use the right vibration dampner to match the flexplate. Have Fun,
-Mat

 

85_SS_302_Coupe

it sucks (I know) to be on the receiving end

15 Year Member

Nov 11, 2003

6,945

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Northern KY

Oct 28, 2006

#3

• Oct 28, 2006

• #3

mattmcdan said:

Just be sure to use the right vibration dampner to match the flexplate. Have Fun,
-Mat

Click to expand...

He hit it on the head....just match the flywheel balance to the right dampener....i forget the numbers right off but later 302s used different balance dampeners than the older ones so if you have an older flywheel then you'll need to get one with a different balance or switch the balance of the dampener.

 

RYC CUKR

Founding Member

May 19, 2002

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38

Orlando

Oct 28, 2006

#4

• Oct 28, 2006

• #4

Most older 302s that are pre 5.0 HOs use a 28oz imbalance while the 5.0 HOs use a 50oz imbalance. More than likely the flexplate that you have is a 28oz and you will need to change the balancer on the engine to a 28oz balancer.

 

U

uedlose

Founding Member

Jan 24, 2001

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Charles Town WV.

Oct 28, 2006

#5

• Oct 28, 2006

• #5

dont put that flywheel on your 50oz balance motor that flywheel is 28oz bal. even if you use the 28oz balancer on the front unless you want bearing problems. you should have the flywheel balanced to 50oz.

 

rd

Founding Member

Jan 12, 2000

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109

Ocean Springs MS

Oct 28, 2006

#6

• Oct 28, 2006

• #6

You need a late model 5.0 style 50 oz damper and flexplate.

My guess is that you need a 157 tooth, small style flexplate. They should be available from aftermarket sources easily.

If you use the older style you will vibrate the engine to pieces.

 

B

bt15

Member

Sep 3, 2003

129

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Oahu

Oct 30, 2006

#7

• Oct 30, 2006

• #7

rd said:

You need a late model 5.0 style 50 oz damper and flexplate.

My guess is that you need a 157 tooth, small style flexplate. They should be available from aftermarket sources easily.

If you use the older style you will vibrate the engine to pieces.

Click to expand...

Spot on!