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Old 12-16-2017, 07:14 AM
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Tony H Tony H is offline
Tony
 
Join Date: Oct 2005
Location: Bandon, Oregon
Posts: 1,545
So I bought a decent pair of 4.5 K-jet heads from a car that had never had the heads off and no coolant in the oil and the head gaskets were not blown. It's always a crap shoot buying used parts from a car that ceased to function for some reason. The donor car looked like it spend decades in someone's backyard. anyway I decided to use 4.5 heads vs 5.6 heads on my project-a lot less issues to overcome. The 5.6 heads could be modified to fit but it adds a lot of unknowns. My calculated CR is just shy of 10:1 but my research has shown a open, small combustion chamber used with a dished piston that has squish bands is a very efficient and pre-ignition resistant combination that should not require a lot of ignition advance to produce max power. In case someone did not read through the entire post the reason I am using K-jet heads is they have a better combustion chamber that allows actual squish.
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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT
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