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Engine firing conundrum

November 19 2017 at 9:49 AM
Pierre  (Login cayuco)

Greetings,
I am taking delivery of a rebuilt 350Q engine from a highly reputable mechanic with solid marine engine experience. We started from a raw block and put in all new components, crank, pistons, rods, heads, etc.. and used the Q intake from my old 327Q.

We're having a back and forth as we wire the distributor. I know, and he knows as he has the Chris Craft engine manual, that Q engines fire 1 8 7 2 4 3 6 5 (LH), with the peculiar 2 and 4 firing next to each other. He is telling me that the firing order of the engine he is delivering is 1 8 4 3 6 5 7 2. This is the same firing order CC had on the "F" engines, and the usual Chevy SB order.

My question is: What does the different Q engine order does and what are the implications of going with the "non-Q" firing order as the engine builder is telling me. Do I run the risk of destroying the engine one way or another with the wrong order (besides loss of power, etc...?) Is it a question of the camshaft being closely associated to the firing order?

I cannot question his expertise and dont want to change what he is telling me unless I can prove him a different setup is necessary.

I hope the engine experts in this forum can shed a light on this pretty crucial subject.

Also, the 350Q that CC offered had only 5HP more than the 327Q and less torque at same rpm. What was the value then of the increased displacement and should I not expect any significant power uptick from my new engine compared to the old 327Q?

Thanks much for your input.

Pierre



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