billla

I didn't save 'em, Alan. Bottom line was virtually NO gain no matter what I put in...

AWilson

I just thought of something, what if they all have too high of duration?

What if you tried a Crane 114142 Powermax, 2050grind ?
216/228 454/480 112 LSA
Supposed to be good with 3.7 gears.

billla

Alan, the specs are right for what you're building At this point, you have nowhere to go but down I ran the cam (remember my comment about needing to break something if asked for another DD? You own me a new stress ball '-))

Results were less HP and less TQ, around 10 less throughout the operating range.

I think you're golden, my friend

63mako

Yes, That is my position. They were designed to get more flow through the flow impared exhaust side of stock heads. If you look at the torque readings the Lunati 60103 was dead even with the single pattern Engle on HP until you hit higher RPM then the Lunati beat it out. On the torque side the Lunati was higher all the way to around 4000, even to 4500, and higher above. It does work better, but the difference in this application is minor. It is more pronounced in the stock smog heads with lower I/E ratios. The 186 heads were pretty good for their time. They have the best I/E Ratio of all the stock heads. (check the chart I posted earlier) In the 70's we used to pull well over 500 HP out of these with extensive porting. Now they are hard to find that haven't been ported, we used them up in the 70's drag racing because they were the best available at the time.

cardo0

U may want to read what Isky has to say 'bout single vs dual pattern cams. It boils down to dual pattern not really needed with good flowing headers. Go to Isky w/s, Tech Info on tool bar, click on TECH TIPS 2000, then longer exhaust duration.
BTW most cam mfr w/s have good info to read for free.

cardo0

AWilson

Don't break nothin I'm just getting a little excited. Thanks a bunch!

AWilson

Interestingly enough, you have to go past 5000 rpm to see more than a 5% improvement with the AFR's.

cardo0

Sorry but i didn't try to pick any cam - just responded to a request for info on the cams.
I would like to see how an Isky 270-Mega-cam would look on a DD - 270*/221*@.050"/108*LSA/.465"lift single pattern and maybe the 264 Mega - 264*/214*@0.05"/108*LSA/.045"lift. Then the same cams again but with 106* LSA. Just curious as DD has some limitations.

cardo0

AWilson

Well guys I think I am beating a dead horse but even with the information provided by Billa I am still having a hard time deciding. I think mostly because I don't know what all the other information on the cam cards mean. When looking at the charts I think the drop off in RPM's over 4500 shouldn't mean much to me as most of my driving will be under that number.

So out of the three:

Engle EP-22HYD 230/230 480/480 110LSA
Lunati 60103Lk 227/233 489/504 110LSA
Comp XE262H 281/224 462/469 110LSA

I'm leaning towards the Engle as the lift is low comparatively.
The Comp XE's are low too but known to be hard on the valve train and noisy.
The Lunati lift is high.


What would you guys pick?

63mako

What exhaust system do you plan on running? Don't know what the input was on the DD for type of exhaust. That would make a difference on results. With stock ramhorns I would pick the lunati. With headers the Engle is probably a good choice. The Comp cam might put your DCR at the limit with 218 intake duration @ .050. You would have to check the DCR.

AWilson

I think I will go with headers to dual exhaust.

billla

DD's were run with small-tube headers and mufflers.

AWilson

Ok,

The Engle cam is the choice.

This thread is finished!

Once I get my heads back in a couple of weeks I will start another thread entitled "383 winter build-up". It will follow the build to completion.

Thanks to everyone!!

AWilson

383 winter buildup thread will be started this weekend.

AWilson

FINALLY, my short block is built. I decided to have the shop do it. I pick it up Friday but was a little excited so I thought I would post the news here in case anyone is interested. It looks like all the hard painstaking decisions have paid off. My CR is 9.54, quench will end up being .040.
I will confirm this on my own after I get it home.
I will post a couple of pictures and a refresher of what the component decisions were this weekend.

2000FRCZ19

i know i am a little late on this one but check out crower cams, they have a very nice high lift roller cam that is close to the one you picked but has quite a bit more lift. look in their cat at page 33 or 34. crower.com

AWilson

Appreciate it but yep a little late and considering the pain in making the decision I am not going to go there except to say I didn't need or want to spend the money on a roller.

2000FRCZ19

i feel your pain. figuring out my combo had me scratching my head for a while also. i went with a 00471s crower cam for my 396 build and it put my dcr in the area of 8.2. it was a little hard parting with that kind of cash for a roller but i think i will be happy in the end. the motor is built and ready for the dyno. good luck with yours.

AWilson

Good luck to you too!