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S197 Boss 302 in Chile Build Thread Profile - S197 Mustangs

3,504
2,692
Exp. Type
W2W Racing
Exp. Level
20+ Years
Pleasanton: 1/2 way between Sonoma and Laguna Seca
Matt--the flywheel is not a slip-fit. You line it up with the holes correctly (as it looks you have done--it only fits one way--and DON'T forget the pulse ring!) then get each of the bolts started by hand. Then use an alternating/star pattern (as shown in the engine assembly manual) to pull the flywheel onto the back of the crank (you will do a few "rounds" of the star pattern) and get it seated. Then you final torque it.
This is exactly my experience as well. It was tight but went on with encouragement.
 

Mad Hatter

Gotta go Faster
3,532
2,051
Santiago, Chile
Thanks, Strange... the crank measures 1.7496" and the flywheel is 1.7441", thats 0.0055" smaller then the crank... And thats on both cars. Going to gently polish them to get at least the same size.
 

Grant 302

basic and well known psychic
Thanks, Strange... the crank measures 1.7496" and the flywheel is 1.7441", thats 0.0055" smaller then the crank... And thats on both cars. Going to gently polish them to get at least the same size.
I wouldn’t do that.

Getting an accurate I.D. measurement isn’t as easy as it sounds. By the time you get to ‘matching’ I.D. and O.D. measurements, the fit of the two parts will be loose.
 
3,504
2,692
Exp. Type
W2W Racing
Exp. Level
20+ Years
Pleasanton: 1/2 way between Sonoma and Laguna Seca
I wouldn’t do that.

Getting an accurate I.D. measurement isn’t as easy as it sounds. By the time you get to ‘matching’ I.D. and O.D. measurements, the fit of the two parts will be loose.
I'll second that. For tolerances this close you really need inside and outside micrometers, not a pair of calipers.
I would not play with this, go with the parts as delivered and install as previously outlined.
 

Mad Hatter

Gotta go Faster
3,532
2,051
Santiago, Chile
Thanks everyone....safe and sound. My mechanic walked over to the local machine shop and left the two flywheels (with a used Crank to check), with the shop owner ... the old timer checked them and called my guy to say take them away, they are fine as they are... right at the tightest tolerances, so he left them as is..... What a relief.
 

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