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GeneBob · 04-12-2021, 01:04 AM

Just adding overdrive will not necessarily get you where you want to be. Your top speed and cruising speed will be limited by your engine torque. If you want to go 55-60 all day, you will need to increase the compression of your engine. The increase in compression will pretty directly increase you torque output. I have run a Snyder's 6:1 and switched to a Lion III head but I am chasing 60-65 mph cruising. You would probably be happy with 5.0 to 5.5:1 compression. The engine will wake up a little but it will not cause long term issues.

04-12-2021, 01:04 AM	#4
GeneBob Senior Member Join Date: May 2017 Location: Denver Area Posts: 433	Re: Max Speed of a Model A in Stock Form Just adding overdrive will not necessarily get you where you want to be. Your top speed and cruising speed will be limited by your engine torque. If you want to go 55-60 all day, you will need to increase the compression of your engine. The increase in compression will pretty directly increase you torque output. I have run a Snyder's 6:1 and switched to a Lion III head but I am chasing 60-65 mph cruising. You would probably be happy with 5.0 to 5.5:1 compression. The engine will wake up a little but it will not cause long term issues.