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And v8 valve springs double or single
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Skwishy View Drop Down
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    Posted: Jun/14/2018 at 7:27am
Hey y'all I'm in the process of rebuilding my 68 290 block and I was wondering if it be alright putting double wound valve springs in. I'm puting in a new cam and lifters. Should I replace any other part of the valve train? Rockers, pushrods?
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gremlinsteve View Drop Down
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Points: 884 		Post Options Post Options   Thanks (0) Thanks(0)   Quote gremlinsteve Quote  Post ReplyReply Direct Link To This Post Posted: Jun/14/2018 at 8:07am
I have brand new lunati springs here at my place I don't need
If ur interested let's make a deal
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Points: 884 		Post Options Post Options   Thanks (0) Thanks(0)   Quote gremlinsteve Quote  Post ReplyReply Direct Link To This Post Posted: Jun/14/2018 at 8:08am
Cam choice dictates the spring choice
Rpm lifter type ect
If it's a street car running mild rpm u would probably wipe a lobe using a double spring
With today's oils
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gremlinsteve View Drop Down
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Stick between 115-130 seat using a mild cam
130-150 using a stout cam

300-330 open for either.   
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Points: 2752 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jpnjim Quote  Post ReplyReply Direct Link To This Post Posted: Jun/14/2018 at 8:20am
Talk to your cam maker,
you may need new pushrods if the base circle of the cam changes,
if you've decked the block, or cut the heads.

You'll need new rocker studs if you want/need an adjustable valvetrain,

most off the shelf cams will have a list of mandatory, and optional parts and recomendations.
71 P-code 4spd Javelin/AMX
some Jeeps and some Fords
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gremlinsteve View Drop Down
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Points: 884 		Post Options Post Options   Thanks (0) Thanks(0)   Quote gremlinsteve Quote  Post ReplyReply Direct Link To This Post Posted: Jun/14/2018 at 8:30am
Yep

I always measure my pushrods lengths to be honest
That way I'm sure
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Skwishy View Drop Down
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Points: 208 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Skwishy Quote  Post ReplyReply Direct Link To This Post Posted: Jun/14/2018 at 8:46am
Edlebrock performer idle-5500 Rom range cam lift .448/472
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tufcj View Drop Down
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Points: 4085 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tufcj Quote  Post ReplyReply Direct Link To This Post Posted: Jun/14/2018 at 8:48am
Most cam manufacturers offer a cam kit that includes cam, lifters, matching springs, and occasionally retainers.  I wiped a lobe on a Crane cam in less than 1000 miles and they wouldn't warranty it because I didn't use their valve springs.  They said the springs I used were too heavy (and probably were).

Bob
tufcj 
69 AMX
74 Javelin AMX
67 Rogue

If you need a tool and don't buy it...
you'll eventually pay for it...
and not have it.
Henry Ford
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Skwishy View Drop Down
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Points: 208 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Skwishy Quote  Post ReplyReply Direct Link To This Post Posted: Jun/14/2018 at 8:58am
https://www.jegs.com/i/COMP-Cams/249/K10-210-4/10002/-1 that's the kit I want to buy
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Points: 6881 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Trader Quote  Post ReplyReply Direct Link To This Post Posted: Jun/14/2018 at 1:05pm
You should check the springs for height, diameter and load, even when buying a "set".
Load can be checked with a bathroom scale and drill press. Your not looking for accuracy in actual load reading but consistency between springs.
Had sets that when compressed 1/2" are 15 lbs or more variation, different heights and even wire size.  Usually buy 2 sets and take one set that all are within 2 lbs, 0.005", no wire size variation and return the other "set". 
Once had to buy a third set.
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