What springs come on eddy performer RPM heads

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scott657

scott657

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Edelbrock 6077, single springs with dampers, 1.460 OD
Im sure this has been asked and answered a million times:thankyou:
MAX LIFT .575
 
The valve spring manufacturer will tell you closed and open spring pressure at at certain lift. You need to do some homework.
 
Now, Here is the combo, those eddy heads and springs
Stock 1976 360 Bottom end
Performer RPM Intake
Eddy 650 AVS2
electronic ignition with jegs box
904, Stock converter( but could change)
Ford 8" rear 3.40 Posi
I was going to run a crane 393801
with the stock heads
Will that cam still work well with the above parameters?
I don't want to kill the driveability with overkill on the camshaft
 
Crane Valve Springs 99835-16

Installed Height (in):1.600 in.

Seat Pressure at Installed Height (lbs):113 lbs.

Open Height (in):1.150 in.

Open Pressure (lbs):280 lbs.

Weaker then the stock eddy springs.....lol

Plus the eddy heads have an installed height of 1.80.....
 
check the stock eddy springs on the heads to see what the actual installed height is....they are usually set higher then the 1.80.....shim them to the correct height at 1.80 and go.................
 
not if you only need 113 lbs on the seat check the height, do the math then shim to get 115 or so
but is that the rght cam- do you own it already?
 
There are probably better grinds that could be selected but if you have it laying around to use there are a lot worse grinds that could be found. I’m assuming 63-64 cc chamber volume? Measure how deep your pistons are down the hole at TDC, those stock pistons have a pretty significant dish to start with. Let us know what you find, that crane grind may like a little more compression than what you may be able to get with a stock 360 bottom end. But that is a good old school grind and it’s easy on the valve train. What vehicle is it going in and what is the intended usage?
 
I just checked dish volume on standard 360 pistons, 9cc’s. We’ll need to know how deep your pistons are down the hole, your chamber volume if different than the 63cc as delivered volume, and what head gaskets your going to use. Yes, go ahead and plan on a converter. What rear tire size are you going to run?
 
Stock motor is still together so I'm not sure I think .1 would be worse case scenario? 8.2 CR
27" tire
Low and mid range are my goals 5000RPM
 
Last edited:
  1. I don't want to kill the driveability with overkill on the camshaf\
Crane cam is similar to the 340 cam as far as duration and 114 LCA is concerned
It is a little fatter but not enough to be worth a change
PM AJFormS and ask about his experience- and many others with that style cam in a low compression motor
post your cranking compression- will give a hint
I see where summit recommend the comp 168 which is a little less expensive but is on 110 LCA
which would pump up the dynamic compression
even though comp shows 10 degrees less advertised Crane and Comp measure
differently so they are about the same
did you say carb and exhaust?
do you have to pass smog?
if you do own the crane and can't send it back sell it or run it and plan on a cam change
look at the 250 lunati or 256 Howards or???
 

I'm going to assume the worst with a piston down hole .060 (typical) and Fel Pro 1008 head gaskets with 8.77 cc's. This is going to yield a whopping compression of 8.6:1. Unless your going with a small roots blower, stay away from the Crane 693801. I would run this specific Howards cam, advanced to the point of building maximum cranking compression.
Howards Cams Hydraulic Flat Tappet Camshafts 711381-10
 
Wyrmrider said:
not if you only need 113 lbs on the seat check the height, do the math then shim to get 115 or so
but is that the rght cam- do you own it already?
Click to expand...
Figure what pressure you need and add 5 psi to it unless its a ragged edge seat pressure. If it IS a high pressure requirement, then assume the cycle loss is figured in...as ive been told many times and has worked for me so far..
To everyone else who might not know or forget to consider, Springs 'break in' 'heat cycle' and lose up to 7lbs .fwiw
 
Garrett - what I said above\
Or the 250 Lunati
they have different LCA so even with the couple of degrees sorter duration with the Lunati they both close the intake about the same time
If you are going to advance then pick the one with the lca that does not screw with the exhaust open as much
Jones Motorhome 256 grind actually closes the actual intake even earlier and is fatter at .200
you pay your money and take your choice
 
I had figured that was it, thought I'd throw a link it out there to help. It's a good cam for the Eddy heads given its lift. It's kind of a relief to see someone wanting to build something they know has low compression and does't expect to make it sound like pro stocker. The only concern is just what will work for their expectations for a reasonable level of performance. I myself would much rather have it get out of its own way than to sound like something it's not.
 

Erson-SBC-Hyd-Flat-Tappet-Cam-lg.jpg

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E420121 - Erson Cams - Chrysler A V8 TQ20H
Part #ERSE420121
$197.80
EACH
Available
The “Performer”. Super low and mid-range power. Good idle, fuel efficiency and driveability. 4 barrel and headers recommended.

WARNING: May Cause Cancer and Reproductive Harm - www.P65Warnings.ca.gov
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  • Advance:
    • 4
  • Application:
    • 1964-1986 CHRYSLER 273,340,360
      ,
    • 1967-1985 CHRYSLER 318
  • Aspiration:
    • Naturally Aspirated
  • Block Type:
    • V
  • Brand:
    • Erson Cams
  • Cam Type:
    • HYDRAULIC FLAT TAPPET
  • CID:
    • 340
      ,
    • 273
      ,
    • 318
      ,
    • 340
      ,
    • 360
  • Duration @ .050:
    • 214/214
  • Duration Advertised:
    • 292/292
  • Grind Number:
    • TQ20H
  • Gross Lift:
    • .449/.449
  • Lobe Center:
    • 112
  • Make:
    • CHRYSLER
  • Part Name:
    • Engine Camshaft
  • RPM Range:
    • 1800-4800
  • Valve Lash:
    • .000/.000
  • Year:
 
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