Need help wit this 428 build..Where are the Pontiac gurus??

[holsey82979]

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

 

[EaOutlaw]

this may help some

http://www.pontiacstreetperformance.com/psp/camselect.html

 

[melsg5]

I'm surprised the 16's running 93 octane and a properly curved distributor gave you ping. The 068 is an excellant camshaft, stock in Ram Air III and 455 HO but it is dated. Have you looked at more modern offerings? Headers would produce more power than D port Ram Air. As far as gearing and stall, I have no idea what you intend to do with this car. A 3:55 rear gear is an excellent all around choice. Assuming the Pertronix distributor has a performance curve already set up you want to use a dial back timing light to get 36 degrees of total mechanical advance. A good plug probably would be the 45S or R45S. As far as oil I use conventional Valvoline VR1 10W30 in silver bottle, not the race only version. You also can you any oil high in zinc and phosphorous, ZDDP. YOu should also get your hands on the books written by Rocky Rotella.

http://www.amazon.com/Build-Max-Performance-Pontiac-V-8s-Design/dp/1934709948

 

[holsey82979]

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.