Toque Converter bolt patterns
Thread Starter
Instructor
Joined: Apr 2006
Posts: 219
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From: Boiling Springs SC
Toque Converter bolt patterns
Finally getting around to putting the motor together for my 73 rebuild. Can anyone give me a little information on which bolt pattern to look for in a flex plate? Basically is there a preference between the 10.75 and 11.5 inch torque converter bolt patterns. The motor is a 427 and trans will either be a TH400 or 700R4. Will this change anything?
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
You can get a flexplate that is "double drilled" meaning it will fit the 350/400 convertor bolt pattern or the metric 200/700R4. Other than that, the 427 is internally balanced, so the new flexplate will not have an additional weight on it and be neutral balanced.
Thread Starter
Instructor
Joined: Apr 2006
Posts: 219
Likes: 0
From: Boiling Springs SC
So the different sizes relate to the transmission size 350 or 400?
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
Sort of. Chevrolet used 2 different diameter 'wheels depending on application. 153 or 168 teeth. (counting the teeth on the flywheel/flexplate ring gear.
Read this- it may shed some more light for you. This was written thinking of the SBC, and you have a BB 427. Pretty much the same except for application.
http://www.speedwaymotors.com/small-...-flexplate.dlp
Read this- it may shed some more light for you. This was written thinking of the SBC, and you have a BB 427. Pretty much the same except for application.
http://www.speedwaymotors.com/small-...-flexplate.dlp
Thread Starter
Instructor
Joined: Apr 2006
Posts: 219
Likes: 0
From: Boiling Springs SC
Sort of. Chevrolet used 2 different diameter 'wheels depending on application. 153 or 168 teeth. (counting the teeth on the flywheel/flexplate ring gear.
Read this- it may shed some more light for you. This was written thinking of the SBC, and you have a BB 427. Pretty much the same except for application.
http://www.speedwaymotors.com/small-...-flexplate.dlp
Read this- it may shed some more light for you. This was written thinking of the SBC, and you have a BB 427. Pretty much the same except for application.
http://www.speedwaymotors.com/small-...-flexplate.dlp
