ATTENTION Engine builder's!

[rapidray]

That is inches, as in THOUSANDTHS, 50 thousandths & 75 thousandths.
Ray.

[phydeauxmutt]

.050 intake side and .075 exhaust side are the minimums

Is that in inches or sillymeters?

[stetracer]

.050 intake side and .075 exhaust side are the minimums

[GregT]

Without knowing what the lift and duration figures are for the cams you're using and what lobe centers you intend putting them on, we're just guessing.

If they're dead stock cams on dead stock timing you should still plasticine the valve cutaways and do a trial assembly anyway.
Others may differ but for a street 8V motor, I'd look for a minimum of .080in valve to piston both sides.

[bwringer]

So, ummmmmmm, what's wrong with the Play-Doh approach?

sorry, 0.020" was taken off

[phydeauxmutt]

Rapidray would be the one that would know those numbers for you.

[one_civic]

Now that I have most of you checking out this post, I need some professional advice on checking piston to valve clearance,

78 750 bottom end, 78 750 cams, 83 850 cylinders ( stock bore, de-glazed on sunnen machine), 83 850 head surface milled 0.020"

Engine is completely dis-assembled, going to be checking piston to valve clearance with degree wheel and dial indicator. (no play-dough, lol)

Questions are...


Does anyone's know the stock, or acceptable piston to valve clearance on an 83 850? (no info in FSM)

Does anyone know the compressed thickness of the OEM GS 850 headgasket? (do not have the old one to re-assemble, only the stock 750 one)

Are their any other metal head gasket's available for the 850 with different thickness's? (i.e. cometic, wiseco, etc.)

At what degrees's should I check (and be worried about) for intake valve ATDC and exhaust valve BTDC contact?



Cheer's everyone,

Darren