Hi all. Long story short: here goes. (This could also serve as a lesson to others, i really just need to be nudged in the only direction im scared to take.) I went through the process of a rebuild of my 304 V8 just over 18 months ago now. I took my time asked the questions i thought were important to the cam supplier and engineer and came up with a combination. Crane H268 10thou off heads/block/bore (she was a well looked after engine) Flat top pistons. Convert rear main to two piece neoprene seal. Dynamically balanced with new balancer. Got it to a tuner (good bloke, did his absolute best) but we cant get the ping out of it. Knock sensor fitted and activated as well. Turns out the compression which we believe has ended up close to 10:1 is just too much for the cam profile. So mr tuner has had to dial the tune back quite substantially. It still rattles at different times (cold nights where air is dense and humidity is low). If i give the accel a little stomp the car gives a decent ping and then takes off. Will rattle up inclines etc etc. So im in a painful spot. After talks with Mr Tuner it goes like this. Roller rockers - higher ratio, maybe that will give the cam the extra lift to bleed some chamber pressure. No, it would be piss all difference. Thicker head gasket? No. It would reduce compression but by how much? Not an ideal solution. Longer push rods required as well. Drop base timing and cut my losses and know im driving a detuned waste of time and money. Engine out. Strip down. Replace pistons with standard dish top, retune, mr tuner can then dial back in some advance and id have what i was originally after. Any options ive missed? Cheers peoples.