Toomey Man Posted June 29, 2014 Report 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
Nightmare Posted June 29, 2014 Report Posted June 29, 2014 If you mean trenching, no. Sent from my HTC One_M8 using Tapatalk Quote
Tedder Posted June 29, 2014 Report Posted June 29, 2014 Nope, 4mil crank will swing just fine in factory cases. Quote
trickedcarbine Posted June 29, 2014 Report Posted June 29, 2014 Nay. Just drops in. May want to look in to case porting. Definitely worth it on a cub cyl. Quote
Toomey Man Posted June 29, 2014 Author Report 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
WINDYCITYJOHN400 Posted June 29, 2014 Report Posted June 29, 2014 Nope he means case porting. Making the cases match your new larger transfer tunnels. Quote
trickedcarbine Posted June 29, 2014 Report Posted June 29, 2014 The part where the transfers from the cylinder sit Quote
Toomey Man Posted June 29, 2014 Author Report Posted June 29, 2014 ok thanks that's kinda what I thought. Quote
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