452 heads with this cam, thanks
Engel
K58 is 230*@.050 & .520 lift
K60 is 238*@.050 & .534 lift

If you have access to a valve spring tester then I would shoot for between 140 to 160 Lbs. on the seats and from 325 to 360 lbs. opened on a flat tappet or hydraulic flat tappet cam and lifters and at least have .060 to coil bind on all 16 springs. I shoot for + or - 5Lbs. on the seats, IE 140 to 150 lbs. on all 16 and use shims to get those results
Make sure on your coil bind clearances, it is far better to have .150 from coil bind at full open than to have .050 from coil bind at max lift
the last set of stock iron heads I set up for a local customer I had to grind some of his darn dampeners to get .060+ from coil bind on a mild hydraulic cam with .545 projected net lift, I told him to use a set of solid lifters with soft checking springs on all 16 valves and make sure and measure the net lift at the retainers to insure he wasn't within .060 from coil bind on all 16 springs
A iron block with iron heads will see a small net gain in lift once it is warmed up or running at or above 160 F

an edelbrock spring will work fine. what won't work fine is the valve guide boss height (especially with aftermarket retainers which the edelbrock spring will need). the boss will need to be trimmed.

Springs are one of those items that can make or break a combination because of quality. Cheap springs with the same specs as a quality spring are just that, and may not do the job well. If it were my project i would call PAC and get a recomendation for your cam. Spend a couple more$$ and you will sleep well.

Thanks everyone. I was looking at comp 911-16 before I asked.

911 maybe but 924-16 better IMO It is a double that requires guide be topped for seals etc
911-16 is great spring and will work if installed at correct height but our rule of thumb puts your cam choice with a 924-16
Hope this helps

I tried to search what i needed. Im glad i asked you guys. Thanks for the help.

i'd use a 924 before a 911. 911 is very aggressive but comp doesn't seem to recommend it for higher lift cams. I don't use 911's anymore.

IIRC engle recommended their 833 springs for that lobe which are similar to the edelbrock. engle did have an 835 spring which is basically a long 833. I think the 835 type spring is what hugh's used when they were selling this engle cam. the 835 will give more seat pressure at 1.90 but I don't think those engles need 140lbs on the seat. those engles are different in respect to comp cams counterparts. they aren't as aggressive and don't have a lot of nose radius like the comps. the 30/38 I have measured 284@.006", 231@.050", 148@.200" for the intake and 291@.006", 237@.050", 152@.200" for the exhaust. a higher ratio rocker other than 1.5 will need a little more spring. I don't use big springs on the engle's I run.

Forgot to mention that there are some big advantages to Beehive springs if you can find one that fits your application. I have them on a 408 with a hydraulic roller and dyno testing has proven the combo good to 6500 rpm.

Cab, you've been racing almost as long as I've been alive so I will defer to your experience

But isn't that a lot of seat pressure for a flat-tappet, at least when considering long-term wear? I seem to recall reading that lobe (or lifter) wear starts to become a problem at about 150#

Have you ever seen or heard of a cam that wore the heel off from to much spring pressure? I haven't You don't want the lifter to loose contact with the lobes as it closes, or jump around when the lobe starts to open the valves, correct
What I have learned is if you don't try something different to go faster or make parts last longer you won't learn or get better or worst
AKA aside, there are many myths in our industry that get repeated over and over, they are not all correct

Good to know, thanks! I'm always learning. What IS the limiting factor for flat-tappet spring pressures then... rocker strength? Side loading? Pushrod deflection?

Any thoughts on my 451's slightly reground Mini-Express mushroom? It is now 272 @ .050, .652 gross lift with 1.5 rockers, .014/.018 lash now recommended by the grinder. I have Comp 953 springs at approx. 140# seat, 430# over the nose. Just now getting the car on the road (mostly paint jail) so I have not yet wound it up tight. I don't plan to wind it above 6900. Do you think I might need more spring pressure than that?

Over the nose load is what kills flat lifter cams. Seat load doesn't really matter. If I could get 370 on the seat and 370 over the nose I'd be thrilled. But AFAIK that's an impossible dream.

The reason you have to keep the seat load down is because if you don't, the over the nose load gets too high. It's called spring rate and it nails you every time.

In my case, with an installed height of 1.700 and gross lift of .620 I needed a spring that is 150 on the seat to get 400 over the nose. Only Crane and Doug Herbert had a spring.

It sucks when the installed night is so short, but it's also not good to have a tall installed height and no lift. The spring isn't close enough to coil bind.

I have some Comp 939 springs for sale in the race section that should work. The 939 is good spring for a modest flat tappet cam.