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
you do know that some of your problem is 50 year old iron heads but i think you said your against aluminum for some reason. i dont know what cam your running but you have to watch your overlap . if your going to buy another cam , buy something w/more lobe seperation. if your going to just cruise the streets you dont want to ruin your engine w/ detonation. get a spring kit for your dist and follow the directions you will be surprised. you can miss match different colored springs to rid yourself of detonation. the head gaskets mentioned are a quality product but as you probably know are expensive. summit has a cam for pontiac that has a part # SUM2800. if you want to really get down to it talk to comp and order a hyd roller you wont be sorry. good luck HTHOM
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Need help wit this 428 build..Where the Pontiac gurus??
in Pontiac General Discussion/Questions
Posted · Edited by HTHOM
WRG #
you do know that some of your problem is 50 year old iron heads but i think you said your against aluminum for some reason. i dont know what cam your running but you have to watch your overlap . if your going to buy another cam , buy something w/more lobe seperation. if your going to just cruise the streets you dont want to ruin your engine w/ detonation. get a spring kit for your dist and follow the directions you will be surprised. you can miss match different colored springs to rid yourself of detonation. the head gaskets mentioned are a quality product but as you probably know are expensive. summit has a cam for pontiac that has a part # SUM2800. if you want to really get down to it talk to comp and order a hyd roller you wont be sorry. good luck HTHOM