Compression Ratio, Will I be able to tell the difference? Options

[sdoolin]

Rebuilding(ish) my 2056. On my first build I was able to achieve a compression ratio of very nearly 9.0:1. With this build, I am having to add .020 spacers below the jugs to get any measurable deck height in the jugs. I am calculating a compression ratio of 8.6:1.

Will I notice the loss in compression ratio?

[Superhawk996]

I’m going to ask a question that I’ve assumed you already have done.

Did you use assembly lube on all bearings and cam / cam lobes / lifters as you did final assembly? You shouldn’t be spinning dry waiting on oil pressure from the pump. Apologize I didn’t bring this up earlier

2nd - have you primed the oil pump gears with a light coat of petroleum grease? This helps ensure a quick prime and build of oil pressure. Again sorry I’m asking late but this is easy to do still.

[sdoolin]

I’m going to ask a question that I’ve assumed you already have done.

Did you use assembly lube on all bearings and cam / cam lobes / lifters as you did final assembly? You shouldn’t be spinning dry waiting on oil pressure from the pump. Apologize I didn’t bring this up earlier

2nd - have you primed the oil pump gears with a light coat of petroleum grease? This helps ensure a quick prime and build of oil pressure. Again sorry I’m asking late but this is easy to do still.

Yep, all bearing inserts (cam & crank) coated with assembly lube (Red Line). Cam lobes coated with assembly lube, same with lifters. Rockers & pushrods & valve tops lightly primed with engine oil. Cylinders coated with engine oil. Oil pump gears coated with engine oil.

Update on oil pressure - spinning the engine by hand produced oil at the oil pump output. Bolted on oil filter mount, turning the engine by hand produces oil into the filter. Installing oil filter and oil cooler and more turning by hand and I am getting oil at the oil pressure sending unit bore. So I will forego mounting the transmission and starter to spin the engine, and will install into the chassis. I still plan to use my new oil pressure gauge on first cranking when the engine is in the car (no carbs no plugs).

Thanks everyone for all the help.