Playing with Desktop Dyno (for what it's worth) shows me a much better torque curve with the 294/300 duration cam vs. the 300/300 duration cam. The 294 cam had WAY more torque in the lower band and kept a much higher curve across the chart. The 300 cam has a high peak HP, but the curve just doesn't seem to hack it. I'm probably going to go with the 294/300 duration cam and 1.6 rockers. That'll give me damn near .600" lift and a better torque curve to boot.

0HP930: The motor had a stock cast iron crank, so I'm moving up to a cast steel crank.

Here's a couple of screenshots of the Desktop Dyno screens:
294/300 cam with 1.6 rockers
300/300 cam with 1.5 rockers

 

that looks like a decent torque curve. whichever peaks sooner is probably what i would go with... this is going to be a street car first and a drag car second, right?

it looks like the dual pattern cam is going to give you more area under your torque curve. judging by the results, thats probably what i would go with. the Desktop dyno isnt that bad really... its purely based on physics; something that cant vary or be skewed. there will probably be some losses in real life due to minor inconsistancies with volumetric efficiency and frictional losses and such... but aside from that, your dyno pulls with this setup should mimic your desktop dyno results.

 

Dual pattern cam? You're talking greek to me now.

Yeah, I was going to run with the 294 cam. I like the fact that Desktop Dyno suggests a starting torque of 330ftlbs @ 2000rpm. That's about peak on the motor I'm running in the ol' '67 now!

 

Just curious, why did you have them deck the block before you got your rotating assembly? How did they know how much to take off the deck to zero out the pistons without bolting the crank in with a piston and rod to check and see how much to cut? Or were you just having them skim it to make sure it was flat?

 

nice. well have to race at the track someday if i ever get my motor done it should of been done 2 months ago i've got desktop dyno 2003 and our #'s are very close. it should be a good race. i have a amc 401ci sb, 224/232 dur @.050 546/563 lift roller, 10.7-1, auto trans, 3.70 gears, 3400lbs car + my 250lbs

good luck with the build


also i want to add. dyno 2000 doesn't read the lobe shape very well on the roller cams. it reads all cams like they have hydraulic cam lobes. i would think the newer one would give you more hp and torque on a roller cam

 

AMC... whats that? "Aint My Car"?

Dual pattern cams are usually those that have one duration/lift on the intake side and then a differing duration/lift on the exhaust lobe. i think i used a Crane 294/304 powermax in my TA and that was a dual pattern gimmick.

cant wait to see how this motor turns out. make sure you take pics and document the progress

 

Alright, yeah the 294/300 would be a "dual pattern" then based on that definition.

I didn't have them zero it, just decked it flat so the heads would mate up nice.

I'll definitely run it down at the track once it's in and broken in. I wouldn't mind giving the old '74 AMC the what-for.

 

cool, that's a nasty cam you picked. i want to see how my little cam motor does against your big cam motor.

flewbyux2- you giving he a hard time? amc is American Motors Co. amc was bought out by chrysler and chrysler only kept the jeep line. javelins where only made from 68-74.

 

Yeah, huge cam with decent lift. Good thing I'm running a manual tranny, otherwise I'd have to run one sick ass converter I can't wait to hear this thing (not) idle.

 

ya, i was going to post that in my last post, but deleted it. i've got a tight 3200 ati 10 inch treemaster. my first pick for a cam needed a 4000 stall. the dual pattern cams idle better i have heard. but it's still going to have a nasty lope and not too bad to drive on the street since you got a 4 speed.

my motor is built for a big cam. so i'm not sure how well it will run with the small cam. ported indy heads and indy intake. i think i might have to put a torker or airgap dual plane intake on it with the small cam. i'll see how it does at the track. my headers are too big for this cam too 1 7/8 hooker's. i've also got big power robbing 727 trans and a ford 9 inch. it should be a good/close race. atleast i hope so.

you'll have to post a video after you get it installed so we can hear that thing idle