Thread: Gen VI HP approximation????

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i would not know why anyone would use a flat lifter cam in the mark 6 engine when towers are casted in the block for the stock roller lifter hardware ? if i was you i would of looked in to this abit more as in the long run could be better set up in the with roller cam .are you sure what you have is not a mark5 block? as all them were flat lifter cam engines ? what heads do you have ? most older bbc till mark 5 used a small oport head small valve dual valve spring rotators intake and EX so if it has the mark 6 heads on it the big O port with no heat EX cross over. but has 16 valve spring rotators that need to be dealed with any spring more then a stock GM valve spring is used . so two sets of rotators eliminators are needed . with no head work then it about what you said maybe abit more on tq carb is to small to see any max power numbers but will work ok at low RPM for the street . so if head work was done maybe more hp .with headders i would say mid 350 hp to 400. with some head work and bigger carb . the 330 hp marine engine was a bone stock 454 with a marine cam flat Hyd cam was about 500/500 223/223 @ 050 and 114 lsa roller cam a abit less lift 483/483 224/224 lsa115