just want some reassurance on combo choices

[Christopher Williams]

Its a Neat Cam The Isky 272/282.

Ok, sounds good

 

[Christopher Williams]

Ok, sounds good

Isky tech support recommendation. He thought I was leaving a lot on the table with the 272/282. I still want to see what you came up with and what you think of this stick

 

[Maniacmechanic1]

Isky tech support recommendation. He thought I was leaving a lot on the table with the 272/282. I still want to see what you came up with and what you think of this stick

I will work with this Isky Cam tonight.

What I came up with requires a Positive piston deck height or custom domed pistons for 600 Hp 272/282.

 

[Maniacmechanic1]

Isky RR558.

 

[Christopher Williams]

I will work with this Isky Cam tonight.

What I came up with requires a Positive piston deck height or custom domed pistons for 600 Hp 272/282.

I'm sure it would have to have some wicked compression to pull that off. That RR 558 is similar to ricksRif I remember correctly. But with a few degrees later on the intake closing

 

[Maniacmechanic1]

I'm sure it would have to have some wicked compression to pull that off. That RR 558 is similar to ricksRif I remember correctly. But with a few degrees later on the intake closing

Let you know.
Must be a modern profile.
RR558.

 

[Christopher Williams]

Let you know.
Must be a modern profile.
RR558.

He said it wasn't a catalog shaft

 

[Maniacmechanic1]

He said it wasn't a catalog shaft

Ok.
RR558 seems to ring a bell.
Think I seen it in my 2004 Isky Catalogue.

 

[Christopher Williams]

Ok.
RR558 seems to ring a bell.
Think I seen it in my 2004 Isky Catalogue.

Maybe, I couldn't locate it. I don't have any of the old catalogs either

 

[Maniacmechanic1]

I am having problems again uploading pictures.
Something is wrong with IMIGUR hosting .

Ran the simulation with the ISKY RR558.
Horsepower about 504 at 5500 RPMs.
Strong torque band in 500+ ft/lbs.

Weak on Top End.
Down 40 HP from the Isky 272/282.

RR558 more like a Pro Tour Hot Cam.

Dynamic compression is way too high with RR558 at 9.019 :1 .

The Isky 272/282 is the Winner still.

Hopefully IMIGUR is working by morning.
Post my results.

 

[Maniacmechanic1]

 

[Maniacmechanic1]

 

[Maniacmechanic1]

More Torque than HP the Isky RR585 cam.
Too much Dynamic compression too for 91-93 octane pump gas.

Isky 272/282 Wins yet.

 

[Maniacmechanic1]

If this was a Pontiac 455 I know several Kick ass Cams by Crower & Isky.
Thumping Heavy Lope Son Of Bitch Race Car Sound that shakes the Ground & Strikes Fear into All.
And delivers Dodge Hellcat Crushing Power.

Can simulate in a small block Chevy but needs a 4.21- 4.25 inch crank stroke.
Pontiac V8 has ultra long rods & Tall Deck block height.
Big 2.000 inch Primary header tubes readily available.
These attributes makes it competitive yet today a Pontiac V8.

 

[Maniacmechanic1]

Also sets off Car alarms & store alarms driving by slow or fast in my 1970 Trans Am.

 

[Grumpy]

that isky cam, you linked too ,(posted just below the crank angle/piston location chart) that charts in 5 deg increments the difference in the cam timing is well under 5 deg
the crower 00471, the isky 558 and the crane 119651 should work,
MAKE YOUR CHOICE, based on what you feel is the best choice
THINK THIS THROUGH
now I let run this thread with FAULTY info,run its course because I don,t believe in squashing discussions
compare the cam timing aT .050 LIFT BETWEEN THE CRANE AND ISKY CAMS
THE CRANE WILL BE SLIGHTLY LESS PRONE TO DETONATION AND BREATH SLIGHTLY BETTER,RICK, used the 00471 in his 406 build and I'm fairly sure he will agree the engines got noticeable power, the crane can I selected for your build is within a couple degrees of that cams timing events, but your MANUAL transmission more than compensates
the piston compresses nothing until the valves close,
changing the cam timing a degree or two will not change the effective compression very noticeably
adding a bit of extra duration allows the engine to breath better at the minor loss of dynanic compression
look at the chart below, your not talking about a great deal of difference in the piston location per degree of crank rotation.
yes that a chart for a 350 not a 375: stroke 400 but the difference is still rather minor as the larger bore in the 400 traps more compressed fuel/air mix once the valves seat.

the combo should have zero problem reaching 500 ft lbs and 550 hp plus
Ive built too many engines to see and expect less with that combo
think about this
your similar combo runs a crower 00471 cam with 236 intake duration and ,adding 4 more degrees of intake duration certainly won,t drop the dynamic compression to 7:1
look closely at the cam cards they list a single degree difference at.050 lift for the intake close point, and only 3 degrees more duration at the intake opening
http://garage.grumpysperformance.com/index.php?threads/small-base-circle-cams.3810/#post-72526

keep in mind this is a small base circle cam with asymmetrical cam lobes you must use the .050 lift and duration numbers in calcs,
the difference in effective duration while small,
yet it aids upper rpm breathing slightly,
it certainly has minimal effect on dynamic compression,
thats one reason I suggest installing it at split overlap,
the extra 4 degrees retarded timing helps reduce any tendency toward detonation.
you know that your 406 SBC with its 00471 crower runs well and its
compression is just under the detonation threshold,
if properly tuned.
the crane 119651 will be similar, but should add about 400 rpm

https://www.summitracing.com/parts/...MIisTdgsuL3QIVlrjACh0EnAAjEAAYASAAEgKCTvD_BwE

 

[Strictly Attitude]

Even with advance calculated in too high compression. On Isky recommended camshaft.

 

[Maniacmechanic1]

that isky cam, you linked too ,(posted just below the crank angle/piston location chart) that charts in 5 deg increments the difference in the cam timing is well under 5 deg
the crower 00471, the isky 558 and the crane 119651 should work,
MAKE YOUR CHOICE, based on what you feel is the best choice
THINK THIS THROUGH
now I let run this thread with FAULTY info,run its course because I don,t believe in squashing discussions
compare the cam timing aT .050 LIFT BETWEEN THE CRANE AND ISKY CAMS
THE CRANE WILL BE SLIGHTLY LESS PRONE TO DETONATION AND BREATH SLIGHTLY BETTER,RICK, used the 00471 in his 406 build and I'm fairly sure he will agree the engines got noticeable power, the crane can I selected for your build is within a couple degrees of that cams timing events, but your MANUAL transmission more than compensates
the piston compresses nothing until the valves close,
changing the cam timing a degree or two will not change the effective compression very noticeably
adding a bit of extra duration allows the engine to breath better at the minor loss of dynanic compression
look at the chart below, your not talking about a great deal of difference in the piston location per degree of crank rotation.
yes that a chart for a 350 not a 375: stroke 400 but the difference is still rather minor as the larger bore in the 400 traps more compressed fuel/air mix once the valves seat.

He can not use the Magic Crane Grind of Yours Grumpy because Dynamic compression is too High for pump 93 octane.
He needs 105 motor octane gas from what I calculated.

 

[Maniacmechanic1]

Rick was the test bed with his T 400 SBC and dynamic compression too high.
Detonation issues.
Later over Revved mysteriously.
Then it all snowballed.
Blown up 200R4.

 

[Maniacmechanic1]

Isky 272/282 still winning.
Delivers Power.
Will run on 87 octane.

Just the Race Drag Car Sound on the street likley not be there.

Real World compromise as we often see here.

PUMP GAS REQUIREMENT.

All That is thrown out the Window once you choose 110 Motor Octane Race Gas.
I have one single Mission.
Street Race Dodge and Win.