Guest tonycutlass Posted June 17, 2010 Share Posted June 17, 2010 I am trying to determine if my 1970 350 is a w31 engineIt has #6 heads with 1.62 exhaust valves and it has a large harmonic ballancer,can some one tell me how to know for sure Link to comment Share on other sites More sharing options...
joe_padavano Posted June 18, 2010 Share Posted June 18, 2010 I am trying to determine if my 1970 350 is a w31 engineIt has #6 heads with 1.62 exhaust valves and it has a large harmonic ballancer,can some one tell me how to know for sureUnfortunately, everything that makes it a W-31 can be bolted to any 350 Olds motor, so without a build sheet and matching VIN derivative on the block, there is no way to know with absolute certainty. You CAN get a good indication if the motor appears to be original and unmolested, and if all the correct W-31 equipment is in place. Assuming the VIN derivative shows it to be a 1970 block, and the #6 heads have the 2.000/1.625 valves, and the cam is the correct 308 degree cam, and it has the W-31-unique balancer, and it has the correct distributor, and the pistons are flattops, then there's a high probability that the motor is an original W-31. Link to comment Share on other sites More sharing options...
Guest tonycutlass Posted June 18, 2010 Share Posted June 18, 2010 would any one by chance have a pic of the ballancers they used or diameter I havent checked cam but its got flat tops and the right size valves,currently have the#6 heads all re built and on my 72 cutlass 355Its standard bore also Link to comment Share on other sites More sharing options...
joe_padavano Posted June 19, 2010 Share Posted June 19, 2010 would any one by chance have a pic of the ballancers they used or diameter I havent checked cam but its got flat tops and the right size valves,currently have the#6 heads all re built and on my 72 cutlass 355Its standard bore alsoI KNEW you were going to ask that... Link to comment Share on other sites More sharing options...
Guest tonycutlass Posted June 19, 2010 Share Posted June 19, 2010 Thanks youre good!Gonna go measure mine Link to comment Share on other sites More sharing options...
Guest tonycutlass Posted June 19, 2010 Share Posted June 19, 2010 what do you think is this a w-31 ballancer ? Link to comment Share on other sites More sharing options...
Guest tonycutlass Posted June 19, 2010 Share Posted June 19, 2010 Its not the same thickness as your pic,mine is only Aprox 5/8" thick,it is 7 1/2 inches tall.Must be something different.Thanks for all the info Link to comment Share on other sites More sharing options...
joe_padavano Posted June 20, 2010 Share Posted June 20, 2010 what do you think is this a w-31 ballancer ?Nope. In addition, a W-31 would never have had a 3-groove pulley because A/C was not available with that motor. Link to comment Share on other sites More sharing options...
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