Toomey Man Posted June 29, 2014 Report Share Posted June 29, 2014 im going to build a 4mil 421 cub motor this winter and was wonding to I need to mod my cases at all for the 4 mil crank? Quote Link to comment Share on other sites More sharing options...
Nightmare Posted June 29, 2014 Report Share Posted June 29, 2014 If you mean trenching, no. Sent from my HTC One_M8 using Tapatalk Quote Link to comment Share on other sites More sharing options...
Tedder Posted June 29, 2014 Report Share Posted June 29, 2014 Nope, 4mil crank will swing just fine in factory cases. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted June 29, 2014 Report Share Posted June 29, 2014 Nay. Just drops in. May want to look in to case porting. Definitely worth it on a cub cyl. Quote Link to comment Share on other sites More sharing options...
Toomey Man Posted June 29, 2014 Author Report Share Posted June 29, 2014 ok I thought so also when you say case porting you mean makin the holes for the pistons bigger are some thing along that line. ( think I know what you mean) Quote Link to comment Share on other sites More sharing options...
WINDYCITYJOHN400 Posted June 29, 2014 Report Share Posted June 29, 2014 Nope he means case porting. Making the cases match your new larger transfer tunnels. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted June 29, 2014 Report Share Posted June 29, 2014 The part where the transfers from the cylinder sit Quote Link to comment Share on other sites More sharing options...
Toomey Man Posted June 29, 2014 Author Report Share Posted June 29, 2014 ok thanks that's kinda what I thought. Quote Link to comment Share on other sites More sharing options...
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