Author Topic: 250 inline 6, different power  (Read 75 times)

Offline ChrisD

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250 inline 6, different power
« on: September 14, 2020, 01:33:18 PM »
I have a 1978 c10 with 250 LD4 engine.
Its a engine with non integrated head (dont know if its normal for this special engine, i find nothing about the LD4)
In 1970 the engine had more hp and more torque and a compression ratio 8,5:1
Dont know which compression ratio my engine has, but can someone tell me, what GM changed to lower the compression ratio?
I had a look to the pistons an rods of 1978 and 1970 engine at rockauto, but theyre the same (must not be original.

Then the 250 mercruiser marine, if I understand it right, it has 165hp, also more than the 1970 250.
I know it has a different camshaft, to lower down the max torque at another rpm
Whats also different?

Im looking forward to your replies!