Isky 270 Mega Cam P/N 390171

-
we sold lots of Isky Mega cams and were a WD/ Perf Engine rebuilder
they rev well-you can miss a shift or over rev at the end of a straight (usually with the 310) without hurting anything
they are specked funny like measuring at .010 on the opening side and.009 on the close
or something like that
what that boils down to is that they are really long on the seat compared to even an Engle or MP @.008 or COMP/LUNATI @ .006 that 270 would be like a 280+ crane
they have little lift for the duration seat duration is long for the .050
they are mild so they have few warranty problems
they are universal- one grind fits all makes and models (I'd sell one to a DIY under a shade tree in a minute)
spend all that money on a stroker best to get a custom cam
do you have air flows, true compression, intake and carb, exhaust and all the info and post it back
and think SFT
however if you already own one try it and make good notes
where do you want your power curve? same place but more- or what?
what's the cranking compression with it
 
scat stroker for 340. 418 cid edelbrock heads. 10.to1 compression. stock hipo exhaust manifolds. I just want to have a cam that makes good power for my combination. I don't want to chang convertor.
 
americal said:
scat stroker for 340. 418 cid edelbrock heads. 10.to1 compression. stock hipo exhaust manifolds. I just want to have a cam that makes good power for my combination. I don't want to chang convertor.
Click to expand...


Then you'd better call someone and have a cam ground. No offense, but why build an engine that big and ring it's neck with junky assed exhaust manifolds? Doesn't make sense.

And, you spent for the nice engine but you don't want to front for a converter?? Another I don't get it.

I'm just trying to get my head around your thinking. Maybe I'm just not getting it. But the cam/converter issue should have been sorted out long before anything else.
 
Last edited:
americal said:
scat stroker for 340. 418 cid edelbrock heads. 10.to1 compression. stock hipo exhaust manifolds. I just want to have a cam that makes good power for my combination. I don't want to chang convertor.
Click to expand...

And how do we know what converter is THERE NOW? Aluminum heads with exhaust manifolds. Might as well put a stock 318 cam in it.
 
americal said:
scat stroker for 340. 418 cid edelbrock heads. 10.to1 compression. stock hipo exhaust manifolds. I just want to have a cam that makes good power for my combination. I don't want to chang convertor.
Click to expand...
OK, you have what you have, who cares as to the reasons why. So.........What rocker arms you running? Cam type preference? Any type you want for whatever reason....doesn't matter. What are the valve spring specs? (Closed and open pressure, installed height max lift etc) How's that for a start? Next.........
 
12many said:
OK, you have what you have, who cares as to the reasons why. So.........What rocker arms you running? Cam type preference? Any type you want for whatever reason....doesn't matter. What are the valve spring specs? (Closed and open pressure, installed height max lift etc) How's that for a start? Next.........
Click to expand...

I gave up when I had to ask more than one question. People like this ask open ended questions expecting good answers with almost ZERO information and then we have to ask what all is in the combo? Horse ****. I got better things to do than pull teeth from someone who should have included all the useful information to begin with.
 
RustyRatRod said:
I gave up when I had to ask more than one question. People like this ask open ended questions expecting good answers with almost ZERO information and then we have to ask what all is in the combo? Horse ****. I got better things to do than pull teeth from someone who should have included all the useful information to begin with.
Click to expand...
I know, just figured what the heck. I'm thinking it might be interesting to see what cam would be recommended for whatever the setup is.....even if the combo made no sense to some. Pinned down in the house all day due to nonstop rain......yup, absolutely nothing better to do:rolleyes:
 
this is what I have. 418 stroker.edelbrock heads 65cc.i have a comp cam 268 xe that lifters went bad. the cam needs to be replaced. I have comp adjustable rockers.750 carb.4.10 gears 727 trans. the reason I don't run headers is because I bought this car new and I ran headers for many years but I am 70 years old and just tired of messing with them. the stock manifolds work just fine.i will not buy another comp cam.
 
12many said:
I know, just figured what the heck. I'm thinking it might be interesting to see what cam would be recommended for whatever the setup is.....even if the combo made no sense to some. Pinned down in the house all day due to nonstop rain......yup, absolutely nothing better to do:rolleyes:
Click to expand...

I can come up with lots of good recommendations, but I'm growing tired of having to beg for help to give help.
 
well recommend something. its red with with black stripes. what else do you need to know?
 
Like YR said I would call and have a custom cam made for the combo,especially with a stock convertor and exhaust manifolds. Most will probably recommend something with split duration on a 112 lobe seperation if I had to guess. There are quite a few of off the shelf cams that will work but you won't spend that much more to get a custom, I would also call a few different companies and see what they recommend.
 
ir3333 said:
you guys might find this interesting.
450 hp ..426 ci.
Click to expand...



Where did you get 450 HP. Didn't watch all the way to the end, but got close enough.

I can tell you that I don't tune like Nick. No way on Gods green earth was 34 total optimal with that head and the junk plug location. That thing should have been at 38 minimum. So there's that.

Then there is the cam timing issue. He didn't change the cam for the headers, and since the customer wanted manifolds the cam should have been ground for that. So it's dead wrong for headers. I'm betting that cam was on a 112 LSA and that is a header killer and helps exhaust manifolds.

I always like watching Nicks videos. He must pay a ton of money for all that editing, unless he's good at it.
 
i think the numbers were 436 / 487 for the header tests. I know there are no cam numbers but around 20 hp/tq loss doesn't seem like a lot.
...and then you have to run it through 20 feet of exhaust pipe and mufflers. Headers may not be worth the trouble on the street. America al just doesn't like headers and that's ok.
 
ir3333 said:
i think the numbers were 436 / 487 for the header tests. I know there are no cam numbers but around 20 hp/tq loss doesn't seem like a lot.
...and then you have to run it through 20 feet of exhaust pipe and mufflers. Headers may not be worth the trouble on the street. America al just doesn't like headers and that's ok.
Click to expand...


It is ok. My point was if the cam was ground for exhaust manifolds (which it should have been because that's what the customer wants) then the headers would be at a decided disadvantage. I think the gain/loss would have been greater if the cam were ground for headers. You could (theoretically) use cam timing with a tighter LSA and the intake lobe could open later and faster with the headers and make even more power.
 
well...back to the cam selection.Seems like everybody is building a 4" stroke small block.
so guys...what are the camshaft specs for your stroker and how does it perform?
 
I'm running an Isky 280 Mega circle track in my 410. On a 106 LSA (in at 102°) 280° adv, 232°@ .050", 68° overlap,.323" lobe (.517" w/1.6 rockers) Vacuum I get about 13" hg at idle in park, 11" hg in gear, idle at 900 rpm in park/gear. Runs in the low 12.2 range +/- happy with it, but want more!
 
You must log in or register to reply here.
-

Back
Top