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Thanks for all the responses its good to know people who will try to help you are still out there..I had the 428 built to stock spec with a .30 over bore..the result was detonation run on and just wasn't running right..we be backed the timing down and it helped but not enough.so we picked out a camshaft with longer duration and overlap and run it on 93 and it helped at low rpm but under heavy load it pings and rattles like hell and it's is a sob to start when it's hot..don't remember the cam specs..some say you can run 10.5 to 1 cr iron heads on 93 with a damn good tune but I'm not that good of a tuner to get it dialed in perfectly..so gonna try 6x 4 heads headers dui distributor and everything that thumpin455 has said..trying to make 400 horses and ass load of torque for a daily driver.probably not gonna see the track just light to light.having said all this the e85 idea is intriguing..then I could sell the 6x 4 heads keep my high compression and run a stout camshaft..what u guys think?? O forgot I running a 400 tranny

It has some camshaft in it that is supposed to bleed off some compression.The motor was built and had detonation and tore back down to install it..This is my first Pontiac build.It doesn't ping at low rpm or when the timing is way low just under heavy stress.I found out that 9.5 to 1 is max cr on 93 octane in a Pontiac. Car will be a daily driver sometimes so i need everything to be very streetable. I bought a pair of 6x-4 heads to lower cr and need to set up the rest to make up for the loss of compression.I was told to try a cometic head gasket to lower the cr from Butler and they do have one to get around 9.5 to 1.I am open to any suggestions (other than aluminum heads) as the 6x heads can easily be sold and I just diddnt want to pass them by. Dont know anything about re curving a distributor as i hear this may stop it with the high compression #16 heads.Hoping i get good info on what to buy for a budget build.

Hello to whoever reads this..I am building a 428 .30 over flat top piston with 6x-4 heads.I had 16's but the cr was too high causing detonation.I am using these heads and 1.52 roller tip rockers,rpm intake,headers 2 1/2 exhaust,pertronix hei,and a jet street master 750 quadrajet. need info on a good camshaft(heard you cant beat the 068),stock converter or stall,headers or RA manifold,gearing,timing recommendations,spark plugs,best oil to use,and whatever else your wisdom can offer from experience.If I can get anywhere near 400 horsepower im good.I need too get this thing right this time.Its all in a 71 lemans. Thanks