Thoughts on this cam?

Bcamp69 · Oct 17, 2019

440 stock bore, 452 heads milled .003, cast crank, ly rods, sealed power pistons I think we estimated compression around 9.6:1 or 9.8:1. Edelbrock performer intake, quick fuel 750 carb. Street car that I’m looking to get more out of over the winter.

What are your thoughts on this cam that is currently in it? How much is likely to be gained from a different one? Suggestions?

Bcamp69 · Oct 17, 2019

Bcamp69 said:
440 stock bore, 452 heads milled .003, cast crank, ly rods, sealed power pistons I think we estimated compression around 9.6:1 or 9.8:1. Edelbrock performer intake, quick fuel 750 carb. Street car that I’m looking to get more out of over the winter.

What are your thoughts on this cam that is currently in it? How much is likely to be gained from a different one? Suggestions?

View attachment 851641

Honestly I’m not sure what all those numbers mean.

451Mopar · Oct 17, 2019

Why such a small follower diameter, or is this a roller diameter? Is that just the recommended minimum diameter, or the diameter used to figure the durations?
Anyhow, 217 duration @ 0.050" is fairly mild in a 440.

BLK 68 R/T · Oct 17, 2019

What sealed power pistons are they? If you are going by the description, they are probably going to be about 7.5:1.

wyrmrider · Oct 17, 2019

Universal grind one size fits all master so seat to seat may be large for .050 duration
let's nail down the compression since you said sealed power and not speed pro
stock those heads do not flow more passing say .450 lift
if you do have low compression we can make a big difference one way
if you dohave mid 9:1 we can take a different approach
did you cc the heads or using ??? for data
FSM gives the minimum which is usually way off smaller than reality
stock valves
gears, converter and how heavy a car
what's your view of street?
daily driver or Saturday night street racer
around town stop and go or mostly freeway
headers or stock exhaust duals etc?
can you blow up photo and turn sideways?

BSB67 · Oct 17, 2019

451Mopar said:
Why such a small follower diameter, or is this a roller diameter? Is that just the recommended minimum diameter, or the diameter used to figure the durations?
Anyhow, 217 duration @ 0.050" is fairly mild in a 440.

And why different sizes?

wyrmrider · Oct 17, 2019

why different minimum tapped diameter ??? good question
they do not appear to using a dual pattern cam with different masters for intake and exhaust
do we have a brand and part number?
stock magnum was 213-225 @.050 but VERY LONG Ramps, wide lobe centers
I'll try and read that printout

moparedtn · Oct 18, 2019

wyrmrider said:
can you blow up photo and turn sideways?

D89DE57C-FB2A-45C7-A38C-DC0807DE563D.jpeg.jpg

wyrmrider · Oct 18, 2019

Printout Duration .006 265
lift .471 cam should work fine try it before switching so you know which way to jump and how far

Jones 256-454 (shorter real seat duration for earlier intake close for low comp and more at .200) above is 127@200 which is where the power flow is
some comparisons
Lunati @.006
253 208 454 all the heads flow, no special machining)
256 213 454

Howard 255 208 .479 @.008 so more real duration than lunati above
shorter duration than printout, same lift, should be more @200
would be good choice (or Jones if lower compression

Lunati 262 220 475 about the same duration as printout cam

Howard 265 218 502 more duration than printout cam but looks the same (difference in lift at measurement)

fratzog lover · Oct 18, 2019

wyrmrider said:
stock magnum was 213-225 @.050 but VERY LONG Ramps, wide lobe centers
I'll try and read that printout

Yes. A reliable mild street cam just like 1968. But with worse 2019 fuel.

wyrmrider · Oct 18, 2019

The problem with the Magnum cam is using it with low compression
It runs Hot
the late closing intake bleads off dynamic compression big time
and the late closing exhaust dilutes the intake charge (helps with smog like EGR)
The intake is somewhere around 300 @.004 and exhaust over 310

Bcamp69 · Oct 24, 2019

BLK 68 R/T said:
What sealed power pistons are they? If you are going by the description, they are probably going to be about 7.5:1.

That’s all the info I have without going to talk to the builder. I’m pretty sure he said it would be 9.6 or 9.8:1. Oh and .020 off the heads, not .003, I was mistaken.

BSB67 · Oct 24, 2019

Bcamp69 said:
That’s all the info I have without going to talk to the builder. I’m pretty sure he said it would be 9.6 or 9.8:1. Oh and .020 off the heads, not .003, I was mistaken.

View attachment 854968 View attachment 854973

Hmmmmmm.

See if you can get the part number.

Can you do a cylinder pressure test?

Bcamp69 · Oct 24, 2019

BSB67 said:
Hmmmmmm.

See if you can get the part number.

Can you do a cylinder pressure test?

With a compression gauge? Yeah I can do that. I’ll try to get the part number also. The 452 heads are likely coming off this winter in exchange for the eddy rpms or trick flow 240’s. Are the pistons identifiable from the top?

wyrmrider · Oct 24, 2019

Maybe
but post your compression test, ignition disconnected- no sparks anywhere and throttle open
and your current cam specs in the same post(make it easy so we do not have to search the thread) and we and perhaps PM AJ/formS
over at https://www.forabodiesonly.com/ and link to this thread
put the trans and gears weight and anything else relevant in the response perhaps aj will run the numbers on the simulator

Bcamp69 · Oct 24, 2019

Bcamp69 said:
My newest concern is this block

With a compression gauge? Yeah I can do that. I’ll try to get the part number also.

wyrmrider said:
Maybe
but post your compression test, ignition disconnected- no sparks anywhere and throttle open
and your current cam specs in the same post(make it easy so we do not have to search the thread) and we and perhaps PM AJ/formS
over at https://www.forabodiesonly.com/ and link to this thread
put the trans and gears weight and anything else relevant in the response perhaps aj will run the numbers on the simulator

Awesome, I’ll get everything posted up in a week or so.

Thoughts on this cam?

Bcamp69

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