wrmhaste 235 #1 Posted June 2, 2014 Does anyone know if the 16,18,20 hp blocks are the same? I've heard rumor they are but I'm not sure. Share this post Link to post Share on other sites
seuadr 488 #2 Posted June 4, 2014 i don't have any specifics on hand, but i've read on here that the stroke is the same? Share this post Link to post Share on other sites
ericj 1,578 #3 Posted June 4, 2014 stroke is different in the 16 from the 18 and 20. check the onan manual and it will give all the specs on the motors eric j 1 Share this post Link to post Share on other sites
seuadr 488 #4 Posted June 4, 2014 My mistake. I thought I'd read that the stroke was the same in a thread asking the same question a couple days ago. Share this post Link to post Share on other sites
Desko 608 #5 Posted June 17, 2014 I know its a little late but the blocks ARE the same its the connecting rods and cranks that are different. Share this post Link to post Share on other sites
wrmhaste 235 #6 Posted June 17, 2014 Better late than never. I found a used block for a 16hp with around 300 hours on it for $75. I haven't picked it up yet as I've been extremely busy. Share this post Link to post Share on other sites
