427 SBF

89 Fox 427 said:
If you ask me, within .015 is good enough for this, considering that's what the shims are.

But I do have a valve spring micrometer.
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Usually the shims vary a bit in thicknesses, as in you may find an 18 or 13 thou in the 15 thou set, which actually can help you fine tune things
 
just throwing this out there, but when you're splitting atoms down 15/1000, just how accurate is the mic?
 
89 Fox 427 said:
Anyone like our use this tool?

Pardon Our Interruption

www.summitracing.com
Click to expand...
I have a proform one, doesn't match what the bench intercomp tester says, and it has a sticky spot that likely messes with the accuracy.
However, you can use it as a bench mark. See what they say new and compare it. Probably just as easy to take a spring off and check it at a shop now that you have the tools.
 
ratssass said:
just throwing this out there, but when you're splitting atoms down 15/1000, just how accurate is the mic?
Click to expand...
Depends on the brand, lol. I don't give my dial vernier any more than +/- a thou when checking the T square but thats still better than being out 15 thou on installed height on a high spring rate spring
 
Thanks to @Patriot Racer for letting me borrow his spring compressor. I will absolutely buy one. The air line to hold valves up is OK. Just some cheap Amazon thing I found for $12. The valve spring micrometer is also an Amazon find for $15. It is exactly accurate to my vernier calipers when checked throughout the entire range.

The installed height with the comp locks are almost exactly as I measured by eyeball. 1.838". Once the other locks get here I will verify and send it!
 
89 Fox 427 said:
Anyone like our use this tool?

Pardon Our Interruption

www.summitracing.com
Click to expand...
I have that one to use on the wives race car, it is fine. It matches my buddies on-bench tester. YOU (or me) is the inaccurate part of the equation when using that tool. How you pull matters. If you pull a little to one side or the other it affects the reading. You need to get a feel for when the valve lifts off the seat. On light springs it is easier than heavy springs. I also have the LSM tester for my engine, it works great.
 
So. I took out the rocker studs to clean them, and it appears they drilled into the intake runner. Good to know. Guessing I should use thread sealer. I would also guess those burrs add horsepower.

20250708_172510.jpg20250708_172520.jpg
 
Yes, plenty of intakes are like that. My engine builder took the time and effort to cut the stuff shorter that extended into the top of the ports. Mine are all blue loctited.
 
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