The E- series & A- series engines use the same piston design. matter of fact, I have used pistons from an A-14 that had a smaller cc crown in an E-16. The stock bore size of an E- sereis engine is 2.992. You can order stock A-14 pistons with smaller crown 0.050 over & will equal 2.992, & I had the head cut 0.050. I have a head & lbock from both. I'll set it up and see what is goin on .

The E- series & A- series engines use the same piston design. matter of fact, I have used pistons from an A-14 that had a smaller cc crown in an E-16. The stock bore size of an E- sereis engine is 2.992. You can order stock A-14 pistons with smaller crown 0.050 over & will equal 2.992, & I had the head cut 0.050. I have a head & lbock from both. I'll set it up and see what is goin on .

I spoke to the mechanic involved in the e15 head a12 speedway outfit that rallycar1200 got me onto and he can do the a15 with the e15 head with modded almost de-counterway crank and modded journals to accept hayabusa rods, his specially balanced alloy flywheel to suit the lightweight (not knife edged) crank and rods and some off the shelf 80s motorbike forged pistons to suit the 2v ohc chamber head. He predicts 200+ engine hp from his a12 engine but a bigger 380cc and longer stroke crank could maybe be similar with more torque. Also he uses flatslides.
This of course is a high revving engine and maybe not as streetable as desired.
He can also do gearbox adapters for a series to toyota and nissan L series gearboxes.

I don't know about the twin cam head but I am interested in the E- series conversion. smaller combustion chambers , crossflow head . sounds like the way to go!!!!!!

Didn't Nissan4eva reckon he was onto one too? I'm all ears.

I thought the one that errol was doing was a G16 head out of one of the newer pulsars

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that is correct, i don't recon thats too hard to do, once you have the pulleys mounted and oil holes sorted out it should be straight forward

wondering if the twin cam would be even worth all the trouble compared to a worked GX head. probably not

Isn't the E series a single overhead camshaft design?
Go the twin cam.

seen two in sprint cars using e15 head, definately do-able...