had a 455 olds in a boat.. run good,,after i first got it spun a bearing,,, hence what that guy said about oil at hi rpm... but another expert after i put a crank in it..said run quaker state it was blended for that hi rpm oil bubblin thingy...and never had a problem after that...and it run at hi rpm all the time in that boat... ive run quaker in everything ever since.....
