cmross13

picked up a B18C1 long block that supposedly has a spun bearing. now im certainly no expert, but the head has some HUGE(looking) intake valves in it, aftermarket springs/retainers, and has clearly been cleaned up a bit on the intake side, possibly the exhaust side too. my micrometer is MIA so i didn't get a chance to measure the valves yet, but intend to on Wednesday.

above the #1(closest to timing belt) cylinder exhaust port there is what looks like a cast-in stylized "H7M" or "HTM", that i do not remember seeing on my JDM GSR head. i didn't have adequate light for a photo, so that will also come on Wednesday.

does anyone have a head lying around they could look at for said stamp/casting? it doesnt appear to be a Honda marking, and im trying to find any info on this head that i can find before i spend a bucket of money on some home made hack job that doesn't flow as well as a stock unit.

cmross13

upon further inspection, i am an idiot, its an "HM", but the stylized cant letters are definitely not like the letters that were on my JDM heads.



i mic'd the intake valves, they are 34mm. granted, there might be 1mm of gunked up crap on them, but the head is going to the machine shop tomorrow to get cleaned up and new valve seals installed, so i'll measure again.





i guess they just looked so big because i never looked at a GSR head combustion chamber. im used to PR3 heads that have the little lip between the head surface and intake valves. speaking of intake, is this just how GSR heads come? looks like its been cleaned up a bit.





also, the springs/retainers don't appear to be stock, unless they are maybe ITR retainers, eh? ive never seen a set of honda springs/retainers that weren't mocha color



then theres the (what i believe to be)B17 cams that were in it. i guess it was turbo'd. maybe B17 cams make power in turbo setups lol

kyden

my 95 gsr head has that stamped on it.

cmross13

Yeah after I cleaned it up a bit I realized it was a Honda Motors stamp. My JDM heads all had a very generic H-M cast in and when I saw the stylized cast that looked like HTM, I got curious.

bgdriver

Definitely had the ports touched up, I think those are not stock retainers either. What's wrong with those spark plugs?

cmross13

Lol the spark plugs are a thing of beauty, eh?