This is a brand new copper .010" thick high compression head gasket for the LT500R Quadracer 1987 ONLY. This gasket can be used on  a bore size of 86mm-89mm. The stock head gasket is about .040" thick, this gasket is .010" thick & it will raise the compression of the engine about 15-20 lbs. I have this gasket on my stock 88 LT500 & it gives me a compression reading on a gauge of 175lbs. I do not run race gas & I have gained better tourque & a bit better throttle response. I have shown 2 different pictures of this gasket but the listing is for 1 gasket. This gasket will NOT fit the 88-90 cylinders. Free shipping is in the U.S only. Thanks