VP 740A engine damper (coupler) alternative

[Scott Danforth]

So I am still gathering parts for the BBC upgrade to the boat. I started looking at the dampers. my old SBC had a triangular damper plate retained with 3 screws. the VP 740's had a round unit with larger springs, retained by all 6 screws.

That was P/N 856346 which is NLA. Does anyone know if the Mercruiser unit is similar? any help would be appreciated.

Im off to the land of Ebay and CL for now

 

[Scott Danforth]

ok, to close the loop on this. the damper drive plate for the 12-7/8" flywheel (10.5" GM clutch pattern) is a volvo only thing

it is based on the standard drive plates, however for the small flywheel.

since the only thing I could find was a used one that had worn out splines, I just ordered a new Alta DA-107 for the 14 inch flywheel which has both the 10.5" and 11" clutch bolt patterns I will simply trim off in the lathe at work.

 

[Bondo]

Ayuh,.... Glad ya figured it out,....

Pretty weird that Volvo runs so many motors with the small flywheel,....

Yer block is drilled for the straight pattern starter, Right,..??

 

[Scott Danforth]

block has both starter holes. new pertronix contour starter is an either-or starter (either 153 or 168) . the early AQ flywheel housing is about 1/4" too small of a casting opening to get a 14" flywheel in it. or I would have got one from Innovation Marine. if the casting had more meat, I would have simply opened up the hole.

flywheel is a 26# SFI 1.1 rated billet unit from Speedway. thought of going with a 16#, however I want the boat to have manors at idle. remember my last car with a light-weight flywheel, if the A/C came on at the light, the motor would snub