[308] valve spring issues.

[VR38]

They look very poor quality, the surface looks rough, not smooth and uniform.

 

[soop]

They're coated in oil? wtf

 

[ari666]

^^^

anyways, after long talks with the sales-rep-dude, i picked up a set of heavy duty crane LT1's. they suit 600 lift, 330lbs seat pressure ( ) and suit 1.75 install height.

installed two just now and they dont even come close to binding, now all i gotta worry about is bending a pushrod or wiping off a lobe. the old springs showed 190lbs on the compression tested, new ones 330lbs. so its a huge step up.

 

[delcowizzid]

wow 330lb is that at 1.7" not gonna be nice on the cam lobes or on collets and retainers since they look stock LOL.you need to make a solid lifter by shimming an old one solid to measure coil bind the lifters will allow over 5mm of preload when theres no oil pressure to hold them out

 

[VR38]

anyways, after long talks with the sales-rep-dude, i picked up a set of heavy duty crane LT1's. they suit 600 lift, 330lbs seat pressure ( ) and suit 1.75 install height.

Do you have a brand and part number cause LT1 valve springs are the Chev HD option.

installed two just now and they dont even come close to binding, now all i gotta worry about is bending a pushrod or wiping off a lobe. the old springs showed 190lbs on the compression tested, new ones 330lbs. so its a huge step up.

Did you get heavy duty retainers too?

 

[Immortality]

^^^

anyways, after long talks with the sales-rep-dude, i picked up a set of heavy duty crane LT1's. they suit 600 lift, 330lbs seat pressure ( ) and suit 1.75 install height.

installed two just now and they dont even come close to binding, now all i gotta worry about is bending a pushrod or wiping off a lobe. the old springs showed 190lbs on the compression tested, new ones 330lbs. so its a huge step up.

i think you mean 330lbs on the nose

330lbs on the nose, good for .600 lift sounds a bit like the old comp cams 26918 beehive springs but they run a 1.8" installed height. about 120lbs on the seat

with the increased spring pressures don't let it idle to low and make sure you have good oil pressure so your getting plenty of lube on the lobes

 

[ari666]

yeah my bad, 330lbs is at 1.2. not seat pressure.

 

[383 hatch]

So not much of a step up at all then?

Crow LT1 springs are 120lb on the seat and 320lb @ 1.2

Not in a million years would LT1 springs take 600 thou lift, it's not possible.

I'd be shimming up a lifter so it's solid and checking, because it would be pretty close to coil bind IMO. Considering LT1 springs coil bind at 1.15" and the installed height is 1.7", that means 550 thou lift is coil bind.

As VR38 pointed out, LT1 springs are just a heavy duty Chev option spring, nothing special.

 

[ari666]

*sigh* ok.

1.260 OD
0.876 ID
107 lbs @ 1.800
348 @ 1.200
coil bind 1.110
395 lbs/in.
0.600 max net lift

i have 'hardened' locks, but not retainers, i have never heard of a retainer breaking. i dont think i need 10 degree locks cos' even though the springs are to suit 600 lift, then cam is still only opening at 511. and only 230 duration, so they are not going to be flapping around much.

but i am ready to be corrected

 

[383 hatch]

So are you getting the heads machined or changing the retainers to suit the 1.8" installed height? If you don't, the installed height will still be what it was with the other springs at 1.7". You will be back in the same boat with these springs IMO.

Also, the seat pressure is pretty low at the installed height.