ISKY cam required parts help

DieseLife April 6th 2015, 10:46 pm

I'm putting an ISKY 280 mega in my 460 for a jet boat I'm restoring. D3ve heads
ISKY calls for:
8005-a springs
507-sta retainers
Block-32 locks
432-hy lifters
#2 shims
Have spring seats cut

Couple questions,
Would you change out anything on the list for something else/better?
Anything wrong with new oem lifters vs the ISKY brand?
Will the stock d3 retainers work with the new dual springs? Or do I need the stepped style for the duals?
Thanks!

supervel45 April 6th 2015, 11:06 pm

I would replace the retainers, locks, and keepers and go with a 10 degree keeper personally. I would go for the matching lifters also, and on the Cam Paul Kane one of the Ford boat Guru's, said the old 280 MegaCam was ok for the time. There where two 280 Mega's also one on a 108 LS and one on a 110 LS by the way. I think the 110LS was better for the jet boats, if I remember correctly.

FalconEh April 6th 2015, 11:14 pm

I have had good luck with those springs with a SG type flat tappet.

DieseLife April 6th 2015, 11:15 pm

This one is 108 lobe. It's about 8.7:1 compression give or take combustion chamber cc. Aluminum impeller so I'm looking at no more than a 5000-5500 absolute tops rpm this impeller can handle. Either an A or AB impeller not sure yet

DieseLife April 6th 2015, 11:17 pm

ill stick with the ISKY springs. Not paying $90 for valve locks though lol I'll probably go a different brand in 10 degree locks and retainers. Any suggestions on those?

supervel45 April 6th 2015, 11:22 pm

Put some Zinc cam Breakin additive especially with the dual springs. I hear alot of good about Rotella oil for breakin also. You might want to look for some lifters with the micro oiling hole in the bottom also.

supervel45 April 6th 2015, 11:27 pm

Do You have the springs allready?

DieseLife April 6th 2015, 11:36 pm

I don't have any of it yet. Lunati sells a micro-trol lifter but in a 71900-16 and a 71900pr-16. Not sure what the difference between the two is.

I'm still toying with just going comp cam Xm270 but I'm not sure.

supervel45 April 6th 2015, 11:53 pm

I ran a Isky 270 MegaCam in my 429 in a truck. I was debating a Comp 270 also but went with the Isky because of the higher lift over the Comp. I later found out Isky rates the lift on a 1.75 ration rocker instead of a 1.73, so the lift was not much different. For a 5,500rpm max engine I would try to get away from the dual springs. A Comp 280 with a .530 lift on the 270 Comp single springs should work out for your use. I used the SVO 351 singe springs with dampers SVO matching retainers and locks, and it would pull to 5,800-6,000 Rpm fine. Comp used to have a good selection of Marine cams, I would look into them, and get away from the Street/Strip cams if you have not bought any parts yet.

FalconEh April 6th 2015, 11:59 pm

I used those springs on a nos motor with 108^ LS 260 550@50 at 8500 RPM on a small block in excess of 5-years without valve float, never a broken spring I do not know how they rate springs, but back in the day I threw many broken crane and comp springs in the g-pail. JMO

DieseLife April 7th 2015, 12:05 am

Comp sells a few marine cams

Won't let me paste the img code here though

DieseLife April 7th 2015, 12:08 am

The ISKY is 232/232 108' and .565 lift

Comp xm270 is 226/236 and .554 lift

Comp xm278 is 234/244 and .574 lift

supervel45 April 7th 2015, 12:22 am

I just looked at the Comp Catalog at those. The Magum cams are the same part numbers as the marine grinds and on a 110LS. They jump from the 268 to the 280, and do not list the 270 Magnum. You could still use the car grind anyway. The extreme energy 270 Marine was right in you application, but Comp wants the dual springs for the higher lift I suppose, and it's closer to a 280 Magnum in duration with more lift. Also notice the impeller reomendations they list. The easy way would be the 270 Magum with single springs. On the Lunati lifters it looks like they don't have the clip retainer that can pop out at high RPM, compared to the non pr's.

gt350hr April 7th 2015, 3:28 pm

supervel45 wrote:I would replace the retainers, locks, and keepers and go with a 10 degree keeper personally. I would go for the matching lifters also, and on the Cam Paul Kane one of the Ford boat Guru's, said the old 280 MegaCam was ok for the time. There where two 280 Mega's also one on a 108 LS and one on a 110 LS by the way. I think the 110LS was better for the jet boats, if I remember correctly.

108 LSA for a jet boat because it needs torque uinder 5,500 . 110LSA for the prop that can turn more RPM. When I was at Sig Erson's we made some higher duration stuff on 106*LSA for the jets with a tunnel ram intake. That was almost 40 years ago though.

supervel45 April 7th 2015, 3:38 pm

I guess it depends on the Jet Boats intended use. For a pleasure type use some people might want a smoother idle and a wider LS on a dual pattern helps. Comp goes to 112LS on their Extreme Marine cams and specs impellers for application.

Straubtech April 7th 2015, 6:25 pm

Stock Ford heads need duration split. They don't want a single pattern cam. It will hit a rpm wall with a single pattern camshaft.

Lem Evans April 7th 2015, 6:50 pm

DieseLife wrote:I'm putting an ISKY 280 mega in my 460 for a jet boat I'm restoring. D3ve heads
ISKY calls for:
8005-a springs
507-sta retainers
Block-32 locks
432-hy lifters
#2 shims
Have spring seats cut

Couple questions,
Would you change out anything on the list for something else/better?
Anything wrong with new oem lifters vs the ISKY brand?
Will the stock d3 retainers work with the new dual springs? Or do I need the stepped style for the duals?
Thanks!

Here is your reference point....

The Ford marine cam was 216*/ 220* 114.5* LSA with much older design lobes from what we have today. It aint gonna be hard to find something better i.m.o.

Dry headers, wet headers or wet logs? It all matters a lot.

DieseLife April 8th 2015, 9:36 am

I don't want smooth idle, rougher the better. Lol it's a jet so unlike a a v drive I don't need it to be smooth for putting into gear. Which is the difference between comps regular cams and their marine series. The marine idles smoother. This is a weekend toy. These are thru transom logs with snails. It's a jet boat, the wilder the better imo as far as idle characteristics, I just don't want to over cam.

I was also suggested yesterday the comp xe274 or dual energy 275.

Xtreme energy 274
230/236
.562/.565
110 lsa

Dual energy 275
219/232
.515/.541
110 lsa

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ISKY cam required parts help

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