Valve spring options

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moparker

moparker

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I have a Lunati 513 533 lift. 234 242 duration vodoo cam in my 71 340. The double springs that came in the kit are too much for the lifters. Did the break in with the singles and all quiet. Put the doubles in and once the motor heats up they get noisey. I do not race this car. I street drive cruise. Never gonna go over 6500rpm. Doubt it ever sees 6000. What would be the best single spring to get the job done? The Lunati springs dont have a damper so I dont want to just use those with the centers out. Thanks
 
Yes. I am researching those. Heard good things about those.
 
I got the part number for my cam and lifter set and it lists the dampers are there. Should I replace them with a better spring or just run those without the centers?
 
Has anyone tried the PAC 1219 spring on a SBM? These are a beehive style LS spring good for up to .625 lift. Seem like the specs would be good for a lot of the street cams we would use.

Specs:
Number of Springs Per Valve: Single
Outside Diameter of Outer Spring (in): 1.207 in.
Coil Bind Height (in): 1.100 in.
Damper Spring Included: No
Install Load: 135lbs
Install Height: 1.800"
Open Height: 1.175"
Open Load: 348 lbs
Spring Rate (lbs/in): 340 lbs./in.
Inside Diameter of Outer Spring (in): 0.885 in.
Valve Spring Style: Beehive
 
gzig5 said:
Has anyone tried the PAC 1219 spring on a SBM? These are a beehive style LS spring good for up to .625 lift. Seem like the specs would be good for a lot of the street cams we would use.

Specs:
Number of Springs Per Valve: Single
Outside Diameter of Outer Spring (in): 1.207 in.
Coil Bind Height (in): 1.100 in.
Damper Spring Included: No
Install Load: 135lbs
Install Height: 1.800"
Open Height: 1.175"
Open Load: 348 lbs
Spring Rate (lbs/in): 340 lbs./in.
Inside Diameter of Outer Spring (in): 0.885 in.
Valve Spring Style: Beehive
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Kinda depends on your spring pocket size, and your valve guide o.d. , and if you can find the right spring locator.
 
33IMP said:
Kinda depends on your spring pocket size, and your valve guide o.d. , and if you can find the right spring locator.
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Noted. I can make a locator to fit a larger pocket if I can't purchase them. I'll have to check the guide diameter but I know I've got the modern style seals that are smaller than the old umbrella style. Time to break out the calipers.
I wasn't sure if the stock LS retainer was compatible with the locks. Probably not the OEM Mopar valves but I'd think that aftermarket single groove valves and locks would be?
 
CRUZE 418 said:
Noisey valve springs?
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These guys are talking about changing valve springs when the Springs are for the cam it says and the guy hasn't mentioned anything about his lifter preload. This is a hilarious read so far...
And ****, I know springs... but I dont know everything or every spring under the sun.. and when I asked opinions on unlisted stock stuff... it was crickets. All these folks and their springs ideas were no where to be seen. Lol which i find strange...Guess it takes catalogs to connect the dots for most.
 
Gonna check my install height tonight. That my be the issue. Lifters get noisey after car warms up. Was fine during break in with singles. Talked to a tech from Lunati. He was actually polite and helpful. I was thinkin I had to much spring pressure. Running stamped steel rockers at the moment. Cant check preload with those. I have tried adjustables and it made no difference. I will keep everyone updated. Thanks for all the input.
 
1. I don't think the springs are your problem.
2. Is this a solid cam?
3. If solid, did you adjust your valves correctly?
 
Granted, I deal with mostly race stuff and solid cams....but I have never seen a hydraulic cam that small that needed double springs....are you sure they sent you the right part? The stock springs that come on Edelbrock heads would probably suffice, and folks throw those out all the time.
 
Conical springs generally have a higher rate than beehives & take more lift.
The beehives can run 10-20% less spring rate than conventional springs because of the reduction in weight that the springs need to control.
I would use the Comp 26986 beehives [ or equivalent ]. Designed for hyd & sol flat tappet cams, 280 spring rate, 650 lift, for small blocks.
 
I would run a Comp 901 on that so quick, it'd make your head spin. Remember, the small block has an unruly pushrod angle. That reduces total lift at the valve about .020". Right in the 901's ball field. Even if they had the full .513 at the valve, which they don't, the 901 would still work. It's just not that hard.
 
The Lunati guy double checked the what they recomended for that cam. It was the same part number as before. I will know more this morning.
 
RustyRatRod said:
I would run a Comp 901 on that so quick, it'd make your head spin. Remember, the small block has an unruly pushrod angle. That reduces total lift at the valve about .020". Right in the 901's ball field. Even if they had the full .513 at the valve, which they don't, the 901 would still work. It's just not that hard.
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Comp 901 Im assuming these are springs?
 
UPSATE. Measured install height. 1.75. Lunati wanted 1.700. During all this. I grabbed a hold of the springs to if any movement. Some I could move lateraly. Some I could not. Not sure if this ia normal or not. I would think not. Might have a valve issue. Any thoughts on this would be great
 
If you can move the springs laterally in the spring pocket, you have the wrong diameter springs. With too tall a spring installed height, those springs are crying for locators/shims. Springs inners rattling against the outers while moving around in the pocket could be your noise.
 
RustyRatRod said:
I would run a Comp 901 on that so quick, it'd make your head spin. Remember, the small block has an unruly pushrod angle. That reduces total lift at the valve about .020". Right in the 901's ball field. Even if they had the full .513 at the valve, which they don't, the 901 would still work. It's just not that hard.
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Or the othern, comp 942's 115 seat @1.75
 
MOPAROFFICIAL said:
Or the othern, comp 942's 115 seat @1.75
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Yeah. I have the 942s on the current slant 6 I am running. That's the main reason I went low lift was to utilize those. ......that and the slant head especially unported ain't gonna support .500 lift. Even ported it's not a hell of a lot better.
 
RustyRatRod said:
Yeah. I have the 942s on the current slant 6 I am running. That's the main reason I went low lift was to utilize those. ......that and the slant head especially unported ain't gonna support .500 lift. Even ported it's not a hell of a lot better.
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140's cfm iirr. Lightly blended and all the horse puck people do brings it to a stock 318 170's cfm. It takes work to hit 190-200cfm with those heads..and a 1.70 valve
 
MOPAROFFICIAL said:
140's cfm iirr. Lightly blended and all the horse puck people do brings it to a stock 318 170's cfm. It takes work to hit 190-200cfm with those heads..and a 1.70 valve
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How well I know. lol I'm using the 911 spring on the closed chamber head as they are all gonna set up "around" 1.850 give or take.
 
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