G5 cylinder head

seabright · Post by **seabright** » Tue Jan 24, 2012 7:55 pm

Hi can anyone inform me if the 250 cylinder head would fit the three fifty, I have been informed the bore size is the only diffrence. please help.

StuBaker · Post by **StuBaker** » Tue Jan 24, 2012 8:08 pm

I think you'll find that the 250 CSR head (coil springs) will fit except that it has no valve lifter. My understanding is that the 350 gained it's extra cc's with a longer stroke rather than an increase in bore diameter. Hope that helps, others with more experience will no doubt clarify.

cbranni · Post by **cbranni** » Tue Jan 24, 2012 9:42 pm

According to Roy Bacon the Lightweight 350 had its own head, and I quote........"the 348cc engines had their own head to suit the larger capacity and bore"
Colin

borrowashboy · Post by **borrowashboy** » Wed Feb 01, 2012 12:55 pm

hi seabright, i think i've got a 350 head in the shed. it came with a 350 barrel and a box of misc bits, including rockerbox with valve lifter mechanism. when i get a minute i'll measure it up.
cheers, bb.

Ian5913 · Post by **Ian5913** » Sat Feb 04, 2012 12:52 pm

Hi SeaBright for info the head differs quite a bit. For instance valves sizes Ian