whats happenin peeps. new to this so i hope someone can help. i bought a f150 with a 351 97 roller block 11 to1 comp kb pistons hydro non roller 69 heads forged internals. i bought this truck on a whim[got it real cheap] this iinfo is what igot the seller. runs strong sounds good, but there is a strong tap under the valve cover. im taking it apart tuesday anyone tellme what i should look for? help please!