Hi Harold, graemlins/waving.gif My 301B3LUN arrived this past Wednesday. I'm going to be running it with 1.6 (Self-guided) new Scorpion (made in USA) roller rockers which I have & GMPP rocker studs for the self-guided rockers. This will put lift at .517/.541 @ .050. I have a new set of Federal-Mogul 817-R lifters for the cam also. I am looking at either of the (2) new Comp single beehive valve springs as they will fit my new Vortec heads without cutting. The choices are #26915 (105 seat load @1.800 & 293 open load @ 1.200) or #26918 (130 seat load @1.800 & 318 open load @1.200). Both springs coil bind @ 1.085.I will use Comp Titanium retainers for these springs as well. I don't believe rpm for this motor (355/93 octane) will be over 6600 at the most. Any thoughts on which of the two springs to pick ? And why you'd pick one spring over the other and the reasons for that. Just want to learn ! Thanks. Dave H

Forgot to include that max reommended lift for both springs is .600". Anything special to do when breaking in the cam with a single spring as nothing can be removed to lower pressure for initial start up/break-in ? Thanks again. Dave H

For anyone interested. Hydraulic. 231*/239* @.050. .517"/.541" w/ my 1.6 rockers. 108* Lobe Sep. To be installed at 102* Intake C/L. (Nevermind the " @ .050 " next to the lift figure in the 1st post :confused: ).

Dave,
Haven't used the new springs yet but have heard nothing but good about them so far,,,,
You can run less pressure as the spring is lighter to the engine which is the same as running a lighter valve or retainer.
They do not have a resonant frequency by design so they do a better job of controlling the valve train.
You should be able to run the lighter spring & run it to a higher RPM than would be possible with a standard design spring of 40=50#'s more.
I know of one person who picked up about 600 RPM on the dyno just changing the spring & retainers.

I personally would probably go the 918 because I am a little gun-shy of new stuff but if you run the lighter ones let us know how they work.
You can be the resident "test dummy" :D

Hey Mike, I'll keep you posted of which spring I select & what the results are. But it 's gonna be at least a couple of months. Thanks for your help. Dave H

Hi Harold, saw you posted recently and hope you'll comment if you get a chance to take a look at the first two posts in this series. Thanks. Dave H

Back to the top.

Dave H,

Sorry I missed this earlier....
I too would go with the 918 with the increased open pressure. The 301B3 will hit 7000 with 330 lbs and the heavier spring/retainer combo. During our dyno testing at Holley, we had a VooDoo 256 with only .454" valve lift hit our 6200 RPM cut-off with STOCK Vortec springs. I'm sure the 301B3 will love the 918s. I hope to have some later in 2005 here at Lunati.

UDHarold

Harold...YGM...

Hi Harold, thanks for answering my latest questions. smile.gif Sorry about resorting to such tactics to get you to see it. :D Just wanted some verification from the man who did the designing. I was 50-50 between the two springs but will definately go with the 26918. Thanks to you & Wolfplace for helping me with this. I will keep you posted when it finally breathes on its own. Dave H