Studs, you mean head bolts?I would argue 60lb springs are stupid not to do for what they cost as far as protecting your engine up to 3800 rpm.
@OP, you don't need a manifold. They get flipped over. I would stud it. Skip the o-rings for now, but do them if you ever have the head off. 5x14s are a good injector for the K27/369 setup. I would advise upgraded locks and retainers with the 60lb springs as well. Stock ones have a tendency to pull through and drop valves over time.
I mean studs unless you have the ability to make the custom washers required for the socket-head bolts. They all need a chamfer on the ID and the ones that go between the valve covers need to be turned down so as not to cut the gaskets. Studs will help hold the gasket better than the socket caps, depends on how much of a gamble you want to take with blowing the gasket.Studs, you mean head bolts?
Would the motor run lean with 5x11's? Or just not enough fuel to reach full potential?
Need to figure out the oil usage, could it be because it is a huffing and a puffing a bit under full pedal?
"60lb" springs are a factory part for a 370 Marine engine. They got the name they have because one of the exhaust brake manufacturers started selling them as an upgrade, advertised as allowing an increase to 60psi of backpressure from the brake, where the stock springs could only handle about 30.A 60 lb spring is more like 150 lbs of seat pressure. Thats good to know. It seemed way to close to the blow open point. K27/369 looks like a very fun setup. Wish I read up on he k27 before getting the super b. Looks like the smaller tubine would contribute nicely to quick spool.
Now, the pressure in the cylinder will not be 100% of boost as the engine is not 100% volumetrically efficient...
Valid points knowing where you’re coming from, and I agree. Biggest difference between fluid handling, and gasses is compressibility. I can’t remember the math, but due to how minute it is many consider liquids to effectively be incompressible, whereas gasses can be compressed substantially. In terms of volume hundreds of litres of air can be forced into a few litre container given adequate pressure (though I feel like the limit is when the gas achieves enough pressure to change state (the whole 1psi of pressure increases boiling point roughly 3* thing)), hence it’s not so much a double standard as a different set of rules for a mediums state.