A little off topic (well engine wise anyway, I do realize it says Pontiac) but just for ****s and giggles, my sons junior dragster makes 46HP from 15.2559 CID LOL (250cc) so smaller must be easier LOL
This comes out at 3.01 using factory ratings for the engine
TQ peak is at 10,500 and peak power at 15,500, factory redline at 18,000
Its a 4 cyl, 4 stroke with 4x 25mm Kehien carbs on 96 octane pump gas.
Not related I know, but sometimes I think you need to look at extremes to make sure you are not clouding yourself with what you think is a limiting factor, I know I have been guilty of this in the past myself. Obviously Pro Stock is the place to look in this thread for more conventional layouts, ie pushrod if you could call their stuff conventional LOL.
I know the thread stated a cylinder head available now, and I realise the logistics and possible suicide mission it would take financially, but would an OHV deal make this easier in the future ??
Back to topic, seriously interested in short block discussions relating to deck height, rotating assy parameters and bay to bay windage discussions if anyone is willing to spill the beans

(as long as its not proprietary information that pertains directly to their business as mentioned)