340 xhead spring shimming, height and pocket question(s)
Thanks guys, in my opinion my install height at 1.660" is good(fsm spec is 1.625-1.6875"), but correct me if I'm wrong? The shorter height gives me increased psi at closed and open.
When I spoke to tech he wanted nothing to discuss doing anything using the 942's. He said the cam was too aggressive for them. When I mentioned the increased psi he said "not enough". I intended to ask him what psi this SFT could take and he cut me off before I could ask.
Im not married to Comp, I dont mind using PAC or anyone else for that matter. I'm hoping I find something that has a 1" ID.
I'll have to wait until Monday to get a quote on machining. I dont have tools for cutter/machining.
Good point on reusing old head gaskets thanks!:thumbsup: Cam is degreed in, so I would like to continue with the measuring etc.
That's what led me to here, I enjoy doing this figgering lol. Heres the build thread.
Restart the rebuild
Looks like beehives are one option without having to machine the pockets?
Man I never thought with this cam it would need some machining.
Any other quality suppliers/mfg of springs out there?
Thanks all, much appreciated!:thumbsup:
This is just my opinion. If both surfaces are final machined and you keep track and replace the gaskets in the same orientation as when mocked up then yes. You can torque them short of your final torque spec in mockup. I save old gaskets ( in good condition) for mocking things up.
If you end up with plenty of coil bind clearance with the springs you end up using you can skip it. Unless you want to do it for the experience which I completely understand.
A while back I asked the question about single valve springs for a 510 lift, I got lots of suggestions. Including the 942, I did all the math it should work I figured. When I talked to comp they told me they weren’t going to. I called three times and finally got a guy to explain that the spring rate wasn’t good enough for the lift plus the duration. I had to get the 995s. As far as machining there’s not to much. Take the valve guides down a little, and cut them for different seals. Summit sold me the tool to do that along with the seals and the install tool.
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I am talking about the combination of taller retainers or keepers and shims to get you to the correct 1.700 installed height. Being that you said the heights now varied from 1.650 to 1.660 a .050 taller keeper would put you over the 1.700 installed height and you will just need to shim it a bit.
