Looking to swap the cam and valve springs out of a 1992 310 hp 454. This valvetrain appears to have positive stop rocker studs.[non adjustable] Guide plates say MARK V on the top sides. I would like to run somthing similar to a 500HP cam but prefer not to convert to a roller cam and really do not want to change the studs out. Any input would be GR8 from all reputable sources. Thanks Guys!

Go with a cam similar to a 454 mag cam or maybe a little larger. The heads won't flow enough to support a big cam. You need to go with new studs for the rockers if you go with a larger cam. You will probably need different valve springs as well. If you go with a cam over .550 lift, you will need roller rockers as well. Your best bet is to just go with 454 mag cam or similar.

The Gen V standard duty has peanut port heads and will not flow past 4000-4500 rpm. and cant possibly make power at or above that rpm range with the stock exhaust. Look for a cam in the range of 205-218 [email protected] .480-.500 lift at valve and112-114 lsa. A cam profile in this range will make lots of torque. JW.

I have two sets of the conversion studs so that you can use standard rocker arms. I also have two complete sets of stock rockers and balls, nuts for the adjustable type rocker arms. I put these on several motors and then used 1.8 roller rockers with the stock cam and would gain 300 rpm on the average for a twin engine set up. PM me for a price or if you would like any other help. Good luck, Robby

I have a set of morel roller lifters if needed to do this swap if you decide to go that route,this will save you some money,

The heads and comp ratio on the 300-330HP are not going to make anywhere near 500HP and unless you switch to a large oval port with 2.19-1.88 valves, good bowl blend, some port work, at least 9.5:1 comp ratio, a suitable camshaft and a performance exhaust, you'll never get even close.

oops wrong thread