savageP521 Posted June 4, 2017 Report Share Posted June 4, 2017 i am about to remove my l16 head and install a L20 head is there any problem with doing this? 1 Quote Link to comment
datzenmike Posted June 4, 2017 Report Share Posted June 4, 2017 None at all a perfect fit. HOWEVER... The 210 L16 head has a combustion chamber size of about 38cc. The head ID is cast into the bottom outside edge, below the #1 and #2 spark plugs and will likely say MADE IN JAPAN 210. When you squeeze the volume of air in an L16 cylinder into it you get a compression of about 8.5 to one. All L20B combustion chambers are much larger at about 45.2cc and when the L16 cylinder volume is squeezed into a larger space the compression ratio is lowered. In this case down to 7.72. This lowers the engine's efficiency and it will lack power even though the L20B head breaths better. There are rare closed chamber heads with 41cc chambers which produce a compression of 8.21 but it is still a loss. I suppose you could have the L20B head milled down by 1mm. (0.040") This would remove 5.4cc from the combustion chamber volume and get the compression closer to normal. A thinner head gasket would also help although I don't know where you would find such a thing. Milling the head will introduce chain slack as the cam is now closer to the crankshaft. You can counter this by moving the sprocket to the #2 or #3 dowel hole or use cam tower shims. 1 Quote Link to comment
spdcrazy Posted June 4, 2017 Report Share Posted June 4, 2017 what is the letters/numbers on the side? u67? a87? 210? w58? 1 Quote Link to comment
spdcrazy Posted June 4, 2017 Report Share Posted June 4, 2017 double post fail 1 Quote Link to comment
shacks510 Posted June 4, 2017 Report Share Posted June 4, 2017 I wouldnt do it unless you need to get back on the road. I had an L16/U67 and it was a dog. No power. Super tall tires and over carbureted didn't help either. Good enough to get around, that's about it. 1 Quote Link to comment
datzenmike Posted June 4, 2017 Report Share Posted June 4, 2017 The U67 and the W58 heads need a cylinder that is at least 82.55mm wide for the valves to fit down into. The L16 is 83mm. This is very close and the cylinder will be shrouding them at the least. 1 Quote Link to comment
shacks510 Posted June 4, 2017 Report Share Posted June 4, 2017 The U67 and the W58 heads need a cylinder that is at least 82.55mm wide for the valves to fit down into. The L16 is 83mm. This is very close and the cylinder will be shrouding them at the least. Yup. The edges of the bores had knicks where the intake valves hit. Good thing they didn't bend. 2 Quote Link to comment
savageP521 Posted June 5, 2017 Author Report Share Posted June 5, 2017 when i got my truck it was tapping loud wouldnt stay running had no power i barely made it home. i pulled the valve cover and found rocker arms laying in the top of head. i had valves that wernt even opening i mcgyvered them back in place and did a valve adjustment.. ran ok but need a new head. i was trying to burn out on a dirt road and she took a dump on me and started backfireing out the carb parked it two years later i blew up the trans in my toyota corrolla and now im mobbin my chevrelegs because both my vehicals are down. i need to get my truck going.asap i will post head numbers and picks shortly im going to pull the valve cover real quick and see what happened im guessing rocker arm is wedging a intake valve open. fml i love that truck 1 Quote Link to comment
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.