*sigh*...broke valve spring compressor.

[Anlushac11]

8)

I have engine hoist on order but it wont be here for close to two weeks so I decided to disassemble head in preparation for carbide burrs arriving so I can start porting the heads.

I have some questions/observations

1) Did the OZ head 250-2v's come with a single valve spring or did they use an inner dampner spring? My Oz head has no dampener springs.

2) Is it normal for the Oz head to use single groove valve keepers? I only remember multi groove valves being used on Fords?

3) The valves are lighter than I expected. Does anyone recognize these numbers?

Intake valve: P140B/EV33157
Exhaust valve: P141?/EV33158

4) How the heck does that engine breath through those exhaust ports. I have the valves pulled in the #1 cylinder and I am amazed by what I see.

The intakes I think look pretty good and will only need minor cleanup.

The exhaust port...has no bowl. Its just a round hole with a square hole in the side. No wonder exhaust flow is so anemic.

Well Im off to go buy another valve spring compressor after job hunting.

 

[addo]

Mark,

No inner spring. Not needed unless over 500 thou lift and mega RPM. True, even if people don't want to know.

Single groove split collets are the norm.

I don't recognise the valve codes, but they sound (familiar), like the stock sizes.

The exhausts - yes, I have noticed some 2Vs just about have worse ports than the log heads. Inlets are jst about fine. Based on what Martín measured on his 221 head, it loks like you can munch about 100 thou off the valve guide boss in the bowl; not evenly but off the port side to promote flow. Go for thinwall type guides if you can.

I also lined up a gasket to get ideas on the exhausts, and ended up taking them to 32mm square, with a 5/16 radius in the corners. You need a flex-shaft tool on these heads to finish the blend on all short sides, and get right up the exhaust. It can be easy to deceive yourself and only open up the last inch or so of the exhaust, so keep this in mind.

Most importantly, hope you get some work! Break a leg, mate.

Adam.

 

[Anlushac11]

8)

My experience has mostly been with Ford 2.3L and some old 302 heads.

My plan was to open up the bowl are under the valve a little , clean up the bottom radius of the port and see if I can raise the port roof a little while trying not to widen the port oo much. Seems when you widen it you lose velocity, at least on the 2.3L's.

I appreaciate any tips and thans for the info.