Custom Grind or Off the Shelf

[wyrmrider]

I see 3HF agressive grinds - 2ed group these are universal .842 grinds
.904 grinds HM near the end
I do not see any agressive .904 grinds
howards grinds are plenty agressive
do not use the 3HF grinds on a mopar except maybe as an exhaust lobe with light valves -springs (beehives) and retainers
I'd use the stiffest pushrods I could find
jj should be shot
.200 data is useful

 

[LowDeck451]

I see 3HF agressive grinds - 2ed group these are universal .842 grinds
.904 grinds HM near the end
I do not see any agressive .904 grinds
howards grinds are plenty agressive
do not use the 3HF grinds on a mopar except maybe as an exhaust lobe with light valves -springs (beehives) and retainers
I'd use the stiffest pushrods I could find
jj should be shot
.200 data is useful

Haha. My bad, it doesn’t say .904, I must’ve seen that somewhere else, dammit. Wouldn’t you agree the Howard’s .904s in the high 220s-230s (to work with my 10:1, right?) have more lift than I want with stock rockers and close to stock 516 heads?
What do you think about Shane at Crowers rec...
#32243 282/292 228/236 112 .478/.502
Thanks

 

[m79ded]

Haha. My bad, it doesn’t say .904, I must’ve seen that somewhere else, dammit. Wouldn’t you agree the Howard’s .904s in the high 220s-230s (to work with my 10:1, right?) have more lift than I want with stock rockers and close to stock 516 heads?
What do you think about Shane at Crowers rec...
#32243 282/292 228/236 112 .478/.502
Thanks

People have used that crower with very good success, I believe you would be very happy with it. If you want you can always look up Mr SixPack he's really good at specking cam's out

 

[wyrmrider]

For stock rockers Howards will have the most lift for a given duration
Lunati not quite so much
Comp HL but still high
Comp Purple plus has less lift but without looking I do not remember what the duration is (not their magnum replacement which i do not like)
so
Crower you might ask shaun about a lower lift exhaust unless that's a shelf cam
Engle
Racer Brown
I forget who Mr six pack gets to grind his cams
Mike Jones is the best picker but he has no hyd in the range you need= he says if you need more than his 256 go solid with EDM lifters
I do not remember if Crower rates their cams at .006 or .005 if.006 that's plenty of duration
you do NOT need 282 @.008 like Engle and Racer Brown that would be about 8 degrees bigger compared to the .006 grinds 290 type cam

 

[wyrmrider]

for reference see
https://www.ft.com/content/c2e5454e-371f-4b0c-bb30-4d7f915f319d post 106
charts are a ways back for any new readers

 

[LowDeck451]

For stock rockers Howards will have the most lift for a given duration
Lunati not quite so much
Comp HL but still high
Comp Purple plus has less lift but without looking I do not remember what the duration is (not their magnum replacement which i do not like)
so
Crower you might ask shaun about a lower lift exhaust unless that's a shelf cam
Engle
Racer Brown
I forget who Mr six pack gets to grind his cams
Mike Jones is the best picker but he has no hyd in the range you need= he says if you need more than his 256 go solid with EDM lifters
I do not remember if Crower rates their cams at .006 or .005 if.006 that's plenty of duration
you do NOT need 282 @.008 like Engle and Racer Brown that would be about 8 degrees bigger compared to the .006 grinds 290 type cam

Post 106 does show the Purple Plus lobes.

The Crower #32243 is a shelf cam. If their adv. is at .006 and using AJforms formula for Intake Closing Angle, that comes out to 69* ICA. Most of the others we’ve talked about are in the low 60s. Wallace calc. says the overlap is 63*. Too much? Hell I dunno. Experienced people have said “don’t overcam a 383” and “don’t treat a 383 like a 440” so that’s why I’m a little concerned about the Crower. I’m trying to stay on the safe side of detonation without going too long with duration but, maybe I have no choice with my 10:1. Is the original Tim Goolsby Bullet recommendation starting to look better now?...maybe?
275/282 230/234. .488/.503. 108/104
Thanks wyrmrider

 

[BSB67]

Post 106 does show the Purple Plus lobes.

The Crower #32243 is a shelf cam. If their adv. is at .006 and using AJforms formula for Intake Closing Angle, that comes out to 69* ICA. Most of the others we’ve talked about are in the low 60s. Wallace calc. says the overlap is 63*. Too much? Hell I dunno. Experienced people have said “don’t overcam a 383” and “don’t treat a 383 like a 440” so that’s why I’m a little concerned about the Crower. I’m trying to stay on the safe side of detonation without going too long with duration but, maybe I have no choice with my 10:1. Is the original Tim Goolsby Bullet recommendation starting to look better now?...maybe?
275/282 230/234. .488/.503. 108/104
Thanks wyrmrider

To be honest, I've lost track of the discussion, but the Crower 271 (32242) has an overlap of 53.5°. Don't lose focus of the fact that you have factory 516 heads and exhaust manifolds on a 383. FWIW, the cam in my 500 cu.in. - exhaust manifold motor that runs 11's at over 120 mph has an overlap of 54°. A really great cam that has great numbers that is too big, is still too big.

Don't get to lost in the weedy detailes of what is or is not happening with ramp rates and lift, and the other details of cam specs, relative to the big picture.

 

[wyrmrider]

he has more compression than I used with DPH 271
" If their adv. is at .006 and using AJforms formula for Intake Closing Angle, that comes out to 69* ICA."
If it's .005 it's earlier (or for an 004 cam it would be even earlier)- ask shaun
I cheat and use the comp website to find lca (not exact for asymmetrical cams and you have to adjust for LCA if different just find a 280 282 cam and look at the timing diagram click on specifications
280 xfi Intake Close ABDC: 69
To degree a DC or MP or stock cam use the ICL and ECL measure down say .050 from the tip on both sides and split the difference to get the center

 

[LowDeck451]

Just an update, I went with the Crower 32243 cam. Talked to Shane at Crower a while back, this cam was his recommendation and said he gives a deal to the forum guys. About $150 cam, $100 for lifters (Summit $180+). Side note; Shane doesn’t work there anymore.
In the meantime I painted the engine bay and building a run stand for break-ins. I also got a Mopar 280 474 cam for free, never run, has very minor surface rust on a couple lobes, cleaned up with 600, then 1500 grit sand paper and WD40. Can’t feel any rough spots but I know, makes me nervous, I’m going to run the Crower.
What I wanted to do with this MP cam is measure the @.050. Someone in an earlier post said this 280 cam was about 238* @ .050 using the MP formula of multiplying adv. times .850. Anyway, here’s what I came up with...
MP 280 .474 110
Dur. @
.006 - 281*
.050 - 232*
.100 - 199*
.200 - 138*
.300 - 47*
Crower #32243 282 228 @.050 .478 112
.006 - 288* Crower measures at .005 iirc.
.050 - 227*
.100 - 198*
.200 - 137*
.300 - 56*
Anything look out of whack? I guess I’ll post further updates and progress over on A Bodies/Big Block, since that’s what it is so...
Anyway, thanks again guys!