Just got through putting new motor mounts in my newest project and was just looking for the stamped GT40P on my heads (which is what the previous owner told me that they were) and right below cylinder one is stamped ROUSH ? Anyone know what they can be ? No part number yet, it got dark on me before I thought to look but the engine has a pretty good size cam, victor jr. intake and a 650 holley dp. Just seeing if anyone has heard of them because I can't seem to find a lot if information on them. Thanks for any help.