Isky Supercams

[travis]

I’m looking at using a 262 Supercam in a very mild 351w. 9.0 compression, ported OEM heads, headers, stock 4bbl iron intake, etc. Isky’s spring recommendation for these mild cams seems way overkill though for what it is though...130 pounds on the seat for this very old profile barely bigger than stock cam. 208@.050, .445” lift single pattern.

Is this profile just bad, jerky, or excessively aggressive (I don’t see this being the case)...or is this just the only spring that Isky offers that fits this particular application?

[Tuner]

Take a look at the Melling MTF-5
204 214 280 290 .449 .473 107 117 112

[travis]

Take a look at the Melling MTF-5
204 214 280 290 .449 .473 107 117 112

I know this grind is cheap and will work with a very mild spring which is desirable in this case for long life. But...the heads I’m using have a pretty high I/E flow ratio (85%) so I’m worried about blowing the low end torque right out the exhaust. This is only a idle-4500 or so build

[Mummert]

The cam works good, the pressure they are recommending is probably just a one size fit all. So they don't have to stock a bunch of different springs for every different flat tappet they sell. 100 seat and 240 open will get you to 5500 no problem. Stock 5.0L mustang hydraulic roller which has similar specs works with 78 seat and 195 open. There is a pretty common 428 FE oem replacement spring that will work fine. Thinks its 95lbs @ 1.8"

[ProPower engines]

I’m looking at using a 262 Supercam in a very mild 351w. 9.0 compression, ported OEM heads, headers, stock 4bbl iron intake, etc. Isky’s spring recommendation for these mild cams seems way overkill though for what it is though...130 pounds on the seat for this very old profile barely bigger than stock cam. 208@.050, .445” lift single pattern.

Is this profile just bad, jerky, or excessively aggressive (I don’t see this being the case)...or is this just the only spring that Isky offers that fits this particular application?

The thing about Isky stuff is they are well made and very hard. about 50-52 RC. They sell the compatible lifters for them as well.
Compared to any comp cams stuff they seem over kill on the springs and yes comp stuff is softer and will not last with higher spring rates.

WE have been using that super cam line since it came out in the 80's always followed isky's spring recommendations and always got their lifters with the cam ever since they stopped bernill testing all FT lifters at factory levels.
at one point in time sealed power lifters all came with a little pit mark on them to signify they passed the brinill test at 50Rc or better.

Never lost any cams in the fleet of trucks we ran using the SC line nor lost any others regardless of brand of engine.

[travis]

Thanks guys. It sounds like the trick flow spring kit TFS-2500100 I bought a while back will work just fine then.

[novadude]

Wonder how the power band will be in a 351W with short duration and 108 LSA? Curious to see how this works out, as I am eyeing the same cam for a very mild low compression 396 chevy in a heavy car with 3.08s.

[travis]

Wonder how the power band will be in a 351W with short duration and 108 LSA? Curious to see how this works out, as I am eyeing the same cam for a very mild low compression 396 chevy in a heavy car with 3.08s.

For heavy vehicles with taller gears and modest compression, I’ve found I like the small cams with tighter LSA’s better than anything else.