Just adding to, so if you already know this, just ignore it, just trying to help.

The cam spec you have now will have radically different ramps as you add lift. Meaning a 286 with a .4 lobe isn't hard on stuff, 286 with a .56 lobe is brutal. The ramp has to get meaner to keep that duration at higher lift.

I think you need more spring as well, especially keeping those duration numbers with more lift.

If the OP is really making 350 passes a year, and is having good reliability at the same time....... I’m not sure I’d mess with it looking for a tenth.

I know for a fact he makes that many passes. He runs that dragster all the time.

He goes rounds everywhere

Man,,that is a lot of drag racing. Think about it like this. You go every saturday for a solid year, not missing a one. You make 7 passes on those days, and you've made 364 passes. Lots O racing.

We can race fri, sat, and sun. Around here all within 1.5 hours drive. He wins his share of bracket races

[quote=fast68plymouth]As I’m sure Greg can attest......... you can spend a lot of $$$ when you’re where you are to find a tenth

You bet! I could have bought a tunnelram, twin Dominators and a few barrels of q16 for what i spent trying to get the tenth i got! I ended up with an inverted flank cam from Mike Jones with .870 lift, 284 / 296/114 in my 528.

Thanks everyone for all the input.

I really like seeing everyone's thought on different topics. That kind of stuff may help someone else also that you don't even realize is paying any attention.

I do like to tinker and try to make my stuff as good as i can for the style of racing we do. Between the last 2 Saturdays i made 17 passes and the car varied .006 thou in 2 weeks. Luckily won 1 of them and then went 0006 red (after i smacked the bump down taking .005 out) at 10 cars the following week.

I am gonna try the 1.6 intake just to see and pass on if i see any noticable difference.

Will probably go ahead this winter and make the cam and spring change and straigten up the heads some.

The next 3 months of racing is pretty heavy for us after we get back from Vegas next weekend so as good as the car has been i'm not gonna do any major changes that i can't just change back at the track for the time being.

i really appreciate everyone's input and just because i don't reply back to each of them and i am paying attention to each and everyone and trying to store as much info as possible.

Thanks Again

If you have not investigate inverse flank roller time to do so
http://jonescams.com/drag-race/
shorter duration for given profile or
more area at the same duration
less side thrust so profile can be easier on the parts or more radical
your choice
Mike Jones is the only one I know of that can make these profiles rpm
uses small wheel for finish grinds
or
Get Rick jones to run his controlled induction software and generate cam profile which can be ground cnc by several different grinders
google "Controlled Induction"
look around the website and watch the demo
https://www.controlledinduction.com/home.html

Just a little update.. Hadn't got to do much experimenting on the car in the last month or so due to it has been very good and some weekends the driver has even showed up.

But took it to a small $1000 to win bracket race yesterday and changed my 1.5 intake rockers and put on the 1.6 intakes and left the 1.5 exhaust rockers on.

Car picked up .01 in 60 ft, .04 to the 330, and .06 in the 1/8th.

Mph only showed 1 to 1 1/2 mph gain.

So that gives me a little more info on what the cam want's at least on the intake side.

Have you tried tightening the lash? What Pushrod size? Do you have titanium valves? I am not sure of the value of Ti valves at your rpm, but would think it would take a lot of stress out of the combo as you get more radical on valve action and lift.

Did you monitor weather conditions on both days. Lots of new bests this time of year. The East coast guys live for Fall testing and new bests and climb out like hibernating bears.

I am building almost the same exact motor and should be going to the dyno within the next month. I have a cam that we are going to base line with and then custom grind a cam maybe the end of next season. This is my combo

572" Mitchell Alum block
Indy -1's 2.250 / 1.81 valves flowed 400/300 @ .800 & 409/305 @ .900
15.1 comp flat tops
single 4 on indy 3x intake
cam is .800 / .760 w/ 1.6 rockers (T&D) and 292/300 @ .050 on a 112 centerline

once I get closer to the dyno I'll post flow sheets and cam card and eventually a dyno sheet. I've had quite the long adventure with the block.

Haven't messed with lash on these 1.6 rockers. Only ran it yesterday with this combo of rockers.

Did run lash the same as the 1.5s.. But didn't want to get to tight cause it is close to the coil bind numbers.

I have 3/8ths 120 wall manton pushrods and stainless valves.

Yea weather was decent but not that great.. 2300 ft and 70 percent humidity .. Same weather in my crew chief pro which is pretty accurate said it was gonna go 4.896 first hit and went 4.837.

That would be some good information to have if you don't mind sharing when you dyno it.

I'll definetly share

Here is a recommendation i got back from Jones camshaft.

Cam# D440, R85510-89480-115
284/296 @.050"
.510"/.480" Lobe Lift
115 LSA

Any thoughts?

There’s really only one way to know how your car would respond to that cam.

I will say...... it doesn’t look like a “350 run” no parts replacement type cam.

But even that there’s only one way you’d really know.