71 'Stang/ new 351W/ orig. C4 compatability

Murray · 02-07-2001, 12:43 AM

My 71 Mustang was originally a 302. I've got a 351W to put in. Can I just bolt up my original C4? I've fitted it all together on the garage floor but I'm wondering if the flexplate counterweight unbalance factor is right. Murray

Gearhead999 · 02-07-2001, 10:33 PM

Should bolt up to 351W without a hitch. They should also be 28 oz imbalance too.

Murray · 02-11-2001, 11:33 AM

Just to follow-up. The 157 tooth flexplate has the same imbalance and will work with the 351W as long as the converter, bellhousing and engine plate match up. I had trouble with the engine plate. It was hard to find one I think because they haven't used the 157 tooth set up since ?73. The plate for the larger flexplate is almost the same except the starter hole is about 1/2" different. Murray

02-07-2001, 12:43 AM	#1
Murray Registered Member Join Date: Feb 2001 Location: Brandon, Manitoba, Canada Posts: 11	71 'Stang/ new 351W/ orig. C4 compatability My 71 Mustang was originally a 302. I've got a 351W to put in. Can I just bolt up my original C4? I've fitted it all together on the garage floor but I'm wondering if the flexplate counterweight unbalance factor is right. Murray

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02-07-2001, 10:33 PM	#2
Gearhead999 Registered Member Join Date: Sep 1998 Location: Oviedo, FL Posts: 992	Should bolt up to 351W without a hitch. They should also be 28 oz imbalance too.

02-11-2001, 11:33 AM	#3
Murray Registered Member Join Date: Feb 2001 Location: Brandon, Manitoba, Canada Posts: 11	Just to follow-up. The 157 tooth flexplate has the same imbalance and will work with the 351W as long as the converter, bellhousing and engine plate match up. I had trouble with the engine plate. It was hard to find one I think because they haven't used the 157 tooth set up since ?73. The plate for the larger flexplate is almost the same except the starter hole is about 1/2" different. Murray