never saw a dyno posted of less than 78rwhp on stock stroke cubs ,have see n as much as 108rwhp on stock stroke cub on alky and drag ported ,expect around 80 with a clean up port and maybe 90 with an agressive style drag port ,its so true the cubs are no joke ,even my ported stock stroke cub runs like a scalded dog on crack add a 4mill stroker cran k and get an easy 10 more ponies than that also cheetah cubs and trex cylinders arent anything alike ,theres nothing to be skeptical about... the cubs are badass motherphuckers the trex are old school like rabbit ears on your tv and really need worked over to hang