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Message: <blockquote data-quote="Raffaelli" data-source="post: 1025907" data-attributes="member: 12402">More than likely you just need a good valve job. Unless your car badly overheated or has north of 250K miles, probably just the top end. Not wanting loads of HP and torque?......LOL. You dont have a v6 mustang do you?  Kidding aside, I would tear the heads off the block and have them checked. Bet ya its a cooked valve or something small. Even if you do have to go thru the motor, 3-400 bucks on new rings, bearings, seals, oil pump, water pump, ect will give you another 15+ years of use. (cylinder walls hardly wear on these motors, hone and reinstall the old pistons) And as far as adding cubic inches, my point of view is this... 347's (and 408 +) are pushing it for a small block. Not because of oiling issues, but because the piston skirt gets very narrow. (and pistons wear the bore faster because of this). less metal to hold it straight. They will last, just not nearly as many miles as a stock motor. If you can get a good deal on GT40's or some twisted wedge heads, you will not be unhappy with the results. You wont realize how much garbage E7s are untill you replace them w something else.</blockquote>