Thread: Gen VI HP approximation????

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Originally Posted by upolka2

Don't have any idea why they had a flat tappet cam in there other than maybe to steal the roller cam and lifters for another engine before he sold it to me?
It is a MarkVI with MarkVI oval port heads. I had to put the 7/16 ARP retro stud kit for my roller rockers and have CompCams beehive springs to match the cam 547/530 227/241 @50
In hindsight, I should have just upgraded the heads to begin with.........

i just built a mark 6 engine much like yours but a roller cam with roller rockers . i did a geat deal of work to the mark 6 heads . i am not sold to write off the stock heads but on even the stock mark 5/6 heads i use the ARP 7/16 top stud 3/8 bottom or if a hi spring rate i drill and tap heads to the old mark 4 rocker stud 7/16 to 7/16 tops. done many of the 5/6 engines over the years . but done more of the mark 4 blocks. i still find them of value .the mark 4 blocks. i still like them in my build ups getting harder to find with stock bores or not pass there life .but pass over the mark 5 blocks it has no value to me.i like the 6 just for the fact that the block is a roller block. most all my builds i find that the roller cam is a better out come