Cams without building valvetrain?
#18
O.P. if you plan on doing the valve springs yourself look in to picking up this - http://www.euroexportinc.com/store/t...ompressor.html . It was worth every penny, and you'll end up using it more often than you think (in my case I was helping all my buddies swap cams, valve springs, and/or valve stem seals).
#19
Evolving Member
You could probably get away with 264's without upgraded valve springs, but why?!? Stock EVO cams are pretty close to that profile already, so you won't feel any noticeable power gains. Your best first step for upgrading your cams is going with 272/272's and while you're in there add some springs and retainers.
O.P. if you plan on doing the valve springs yourself look in to picking up this - http://www.euroexportinc.com/store/t...ompressor.html . It was worth every penny, and you'll end up using it more often than you think (in my case I was helping all my buddies swap cams, valve springs, and/or valve stem seals).
O.P. if you plan on doing the valve springs yourself look in to picking up this - http://www.euroexportinc.com/store/t...ompressor.html . It was worth every penny, and you'll end up using it more often than you think (in my case I was helping all my buddies swap cams, valve springs, and/or valve stem seals).
#21
Evolving Member
#23
So I was taking a look at an all data computer on a valve spring job and its said to be like a 9 hour job. My mechanic told me to look up if there's any special spring compression tools needed or do people have anything they fabbed up. I'm trying to do this right and I'm gonna look for a thread on here for valve spring replacement. Anyone have any expierience with doing valvesprings with the head still on
#25
Evolved Member
iTrader: (15)
75k here on the stock block and valvetrain. I installed comp 280s at 65k with zero problems.
Everyone here keeps throwing around "272" "280" etc. Even if they're called 272s it doesn't mean lift duration etc are near the same. Comp 280s are mild compared to kelford 272s.
Everyone here keeps throwing around "272" "280" etc. Even if they're called 272s it doesn't mean lift duration etc are near the same. Comp 280s are mild compared to kelford 272s.
#29
So I was taking a look at an all data computer on a valve spring job and its said to be like a 9 hour job. My mechanic told me to look up if there's any special spring compression tools needed or do people have anything they fabbed up. I'm trying to do this right and I'm gonna look for a thread on here for valve spring replacement. Anyone have any expierience with doing valvesprings with the head still on
#30
Evolving Member
Ive said it before in a previous post that it is a "general rule of thumb". Obviously each manufacturer is different; and thus, validates the claim of different horsepower/torque/powerbands for the same sized camshaft. Aftermarket camshafts contain different lobe separation angles/durations/lift which provides the basis on why some lope harder or why some are more DD or idle friendly; however, the modification of valve extension and durations exceed the factory tolerance or its design and further substantiates the the need to adjust: idle tables/pulse width/timing advance/idle recovery tables/fuel trims in an attempt to gain not just additional power but maintain operational function. The larger the camshaft and more specifically the increased lift and longer durations kills the application of low end torque but increases the application of higher horsepower/torque higher in the RPM band. Because the need to rev higher to achieve the full benefit of aftermarket camshafts, being the valvetrain is already out of tolerance, it is not recommended. Stock cams are designed to achieve a balance of power and drivability as it pertains to the design limits of the associated components. Going slightly larger might not exceed tolerance limits enough to worry about but there is and always will be a limit. Thats why its a general rule that 272s require upgrading valve springs and retainers to accompany the higher rev range and increasing the components tolerance levels. To each is his own and im glad to hear that you havent had any issues with your set-up but in all precautionary measures it wouldnt be wise to suggest such upgrades based on one application, of course there are numerous members that have done it but there are an equal amount that have had the repercussions of such attempts. Do it right the first time and you wont have to worry about a failed component. Im speaking out of reasoning and fact, it might benefit you to research your equipments tolerance range before making recommendations to other members...if he makes the call based on your remarks amd is subjected to equipment failure its on his dime and not yours. Like I said, better safe than sorry...do it right the first time.
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