I would. You just never know what's in there if you can't hear it run. I once got an engine from a guy that told me it ran good when he pulled it and it had been in his garage ever since. I took his word cause it looked fine on the outside but when I got it home I pulled the spark plugs and water came pouring out of nearly every cylinder. It was completely froze up inside and I broke the crank in half beating and prying it apart just to save the block. Talk about something to make a guy mad :angry4: