Jah6792020 Posted December 6, 2019 Report Share Posted December 6, 2019 I have a Racecar at Local Racetrack. My car is a 510. I am looking at bottom ends and I like the 6.50" rods and a 2400cc bottom end. I raced earlier this year with a high compression L20B amd blew a double felpro gasket set up ( too Much Compression). I would like to reuse my head, because our rules say 2 valves per cylinder. So the KA head is not an option for me.. I know typically everyone wants the KA24E head on a L20B bottom end. Our Rules... 2600cc max, 2 valves per cylinder, porting and polishing, roller camshafts, Holley 350 carb (7448) , header is ok... I am trying to figure out what holes need to be welded on the head to stop the water in oil situation. I am thinking on adding links onto the L20B timing chain and I can run a line from where oil pressure guage goes to pressurize the oil bar in head.. my existing header will bolt up and I have a manifold. Has anyone tried going the opposite way of what everyone else does? 1 Quote Link to comment
datzenmike Posted December 6, 2019 Report Share Posted December 6, 2019 There is a coolant passage in the back of the KA block that would connect into an oil drain back hole in the L head. I guess an L head will work with a single chain timing chain. You'll need a fuel pump eccentric. A car KA has a large crank girdle but a truck doesn't so fitting it into a Datsun would be easier. KA compression with L head would be around 8.64. I would find a Z24 engine and do it instead. Everything fits. Already as dual timing chain though it needs 4 links added. Compression is 9.44. Your L series oil pan and engine mounts will fit the Z24 but not the KA... KA main bearings are much smaller than L or Z series. Z24 rods (right) are beefier than the KA... 1 Quote Link to comment
Stoffregen Motorsports Posted December 6, 2019 Report Share Posted December 6, 2019 There are many ways in which the Z24 is a better choice. Quote Link to comment
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