Sum-6900 cam in 1990 360

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dvanecek

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Charleston, SC James I
I just picked up a 1990 360 to put in my 87 d150. I'm putting this motor in to sell the truck. I bought the summit 6900 cam to put into the 87 318 that I was going to freshen up but bought this 360 for cheap. From what I've read the 1990 360 motor it's pretty good for horsepower and torque. I will be doing a timing chain,weiend dual-plane, carter 625 and maybe headers regardless. 95% the work for wappings the cam will be done.

2 questions.

1)can I put that cam in the roller motor?

2) will I get enough of a performance bump to make it worth putting it in a truck I'm selling?
Thank you very much
 
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It will not be a performance gain over the factory roller cam, IMO.
 
I would run the roller cam. I also think that cam has the fuel pump snout on the front of it (my '89 did).
 
Thnx for the replies. I really just wanted to know if they were mechanically compatible. My understanding is that since the same block casting used roller and non-roller lifters I could.
If were keeping the truck I would buy a roller cam not use the cam I bought to replace the broom handle dodge put in the original 318.

As far sarcastic comments go, I guess I should have kept the high performance ESC ignition that it came with in 87 and I'm definitely gonna take the time to get the TBI working.

Just pointing out newer is not always better.
 
Also too, the 5.2 roller cam is considered the better of the two. A lot of people "upgrade" their 5.9 magnum with the 5.2 camshaft. I don't know the particulars, but it's better somehow.
 
RustyRatRod said:
It will not be a performance gain over the factory roller cam, IMO.
Click to expand...
that's being kind
Summit 6900 Tappet lift not specified, so I'm assuming .006 or .008, not .001
278/288/112
204/214 @.050
.421/.444 lift
Here's what that #6900 will feel like in your 360 @ elevation of 250 feet elevation (all work-ups will be at 250ft)
Static compression ratio of 8.0:1.
Ica of 68*, 250ft elevation
Effective stroke is 2.69 inches.
Your dynamic compression ratio is 6.26:1 .
Your dynamic cranking pressure is 116.83 PSI.
V/P (Volume to Pressure Index) is 95
VP of 95 is somewhere between slanty and smogger-teen, and will make a dog out of the 87 D100 up to about 3000/3500rpm, unless you install a a big TC and gears.

That cam needs
Static compression ratio of 10.0:1.
Effective stroke is 2.69 inches.
Your dynamic compression ratio is 7.76:1 .
Your dynamic cranking pressure is 155.82 PSI.
V/P (Volume to Pressure Index) is 126
to feel like a 5.2 Magnum

And
Static compression ratio of 10.5:1.
Effective stroke is 2.69 inches.
Your dynamic compression ratio is 8.14:1 .
Your dynamic cranking pressure is 165.96 PSI.
V/P (Volume to Pressure Index) is 135
To be peppy

and that doesn't even address where the intake valve actually closes.....

To be fair, once you get her wound up, say after 3600/4000, she'll start to wake up inside your 8/1 360.......... so with 3.21s and 235/75-15s, that would be starting at about 36mph. Forget spinning the tires from take-off.


Now, if I got this right, the factory 5.9 cam is a 250/264/110 and in at 105(forget the 119 factory install) your Ica is 51*.
and I get;
Static compression ratio of 8:1.
in at 105 for Ica of 51*
Effective stroke is 3.08 inches.
Your dynamic compression ratio is 7.02:1 .
Your dynamic cranking pressure is 136.38 PSI.
V/P (Volume to Pressure Index) is 127
You see that 127VP? Thats a tic over a 5.2 Magnum (124VP), so now your 360 is taking off like a 318 Magnum..... up to about 3000/3200

The stock 119*install ( if I downloaded that right), will get you an Ica of 64* and you will get this pathetic deal
Static compression ratio of 8:1.
Effective stroke is 2.79 inches.
Your dynamic compression ratio is 6.46:1 .
Your dynamic cranking pressure is 121.93 PSI.
V/P (Volume to Pressure Index) is 103
Vp of 103 is IMO pathetic, I mean a Smogger-teen makes more than that; (~113), a slanty ~87

Bottom line is that cam is not a stab-it-in-and-go deal
Compare the 127VP of the stock cam advanced to in at 106, to the VP of 95 with the #6900 with the Ica @68*... that is a direct loss of 25% low-rpm performance

If anyone has other specs for the stock 5.9cam,or specs for the 5.2cam, or knows the exact specs for the 6900, lemmee know and I will gladly edit.
 
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RustyRatRod said:
Also too, the 5.2 roller cam is considered the better of the two. A lot of people "upgrade" their 5.9 magnum with the 5.2 camshaft. I don't know the particulars, but it's better somehow.
Click to expand...
AJ/FormS said:
that's being kind

278/288/112
204/214 @.050
.421/.444 lift
Static compression ratio of 8.0:1.
Ica of 68*, 250ft elevation
Effective stroke is 2.69 inches.
Your dynamic compression ratio is 6.26:1 .
Your dynamic cranking pressure is 116.83 PSI.
V/P (Volume to Pressure Index) is 95
VP of 95 is somewhere between slanty and smogger-teen, and will make a dog out of the 87 D100 up to about 3000/3500rpm, unless you install a a big TC and gears.

That cam needs
Static compression ratio of 10.0:1.
Effective stroke is 2.69 inches.
Your dynamic compression ratio is 7.76:1 .
Your dynamic cranking pressure is 155.82 PSI.
V/P (Volume to Pressure Index) is 126
to feel like a 5.2 Magnum

And
Static compression ratio of 10.5:1.
Effective stroke is 2.69 inches.
Your dynamic compression ratio is 8.14:1 .
Your dynamic cranking pressure is 165.96 PSI.
V/P (Volume to Pressure Index) is 135
To be peppy

and that doesn't even address where the intake valve actually closes.....
Click to expand...


Great info. I could not find any cam specs on the 1990 360 cam. Leaving the original cam in will save me some time.

I do know it would have really woken up the 318 I bought the cam for. That cam is damn near flat.
 
yes...you can use a Flat tappet instead of the roller.....question answered...lol
 
you can interchange the cam and lifters and pushrods
you do go backwards
the summit cam is at advertised .004 like crane
you can find and compare in the list I posted in the 318 cam sticky thread
if you have the roller lifters a take out/ pick a part early 5.2 magnum cam would be the best answer
but since you own the Generic summit one grind fits all cam and area going to sell the truck price the lifters and pushrods and go for it if much cheaper than a 5.2 roller
I have the specs for the rollers I could find in the list- additions welcome
 
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