Tagged: Big valve head

OHV big valve head

Another big head

Mike dropped off two OHV heads with me on Sunday, one was a head a sort of rebuilt a year or so ago, but it failed, appears one of the valve stems came out? Never mind I shall look at that another time. But more interestingly was a semi ported...

1057cc

1057cc engine

Right well, now the shed has a roof and the workbench is looking lonely, I thought it a good idea to get one of the engines from the garage home and start looking at it. First in the pile was a bare block I got from Telford last month. nothing...

1159cc

HA running again

Well today was the first opportunity I have had to drive Marvin since the head was swapped over, didn’t go too bad at all, a bit of smoke at start up, which was expected. The tappets are quiet now!! After a few miles I stopped and checked things over, no...

Alive

Well the rain stopped this morning , so out I was playing with Marvin. Managed to get the head back on and everything refitted in a few hours. The only issue I have is to remove and refit number three spark plug I have to be very careful as the...

NTD890C Head

Studs ahoy

I took a couple of hours off work this afternoon and popped over to IB Engineering and borrowed the boss for an hour and we now have this: yes 8 rocker studs and the head all clean and ready to rebuild, so this evening I did just that, and used...

NTD890C broken rocker stud

Tappets, Easy I should say so MEH!

Today I thought I would have another try at the tappets, and maybe change a few of the rocker stud nits as they were too loose, there is also a tight as hell nut. So get the tools out, in the rain I might add (see I am keen!), warm...

1159cc

Head on

Right lots done tonight, the big valve head is now on the 3/8th block, made myself a couple of dowels out of old bolts and lots of tape. The head is now on and torqued down to 50 pounds to start with. I have also fitted and bolted on the...

1256cc

Dead Head

Spoke to the machine shop today, the 1256cc big valve head is rubbish. The valve stems are so worn one can rattle the valves in the them, it doesn’t help that the person who “modified” the head decided to machine half the stems away to open out the inlets… I...

1256cc

Sunny and warm sunday!

Today has been a busy day! First I stripped the head off the 1256 engine down, and have wrapped all the parts up nice and safe ready for when it gets put back together, the bare head itself will be cleaned down and repainted, the bores and ports de-coked and...

Ported heads

I removed one valve from the 1256cc head, its highly ported, I am a little worried its gone to far, but once the head is stripped cleaned and checked over I will have a better idea. below is one dirty picture, that shows some of the porting done. I am...