1971 Experimental heads?

[BURN-BROS]

Hello all,

We just took apart a race motor that had a strange set of heads that I have never seen before.

Specs
casting date of 3/71
901.104.302.0R
46/40 valves
36MM intake
38MM exhaust.

They are not welded in any way and look very factory. I cannot prove that the exhaust was not enlarged at a later time but the concensus is that it may have been a Turbo at one point in time.

Notice the quench area similar to the IMSA 962 head...Could this be a progenitor of the Monster engines of the 70's?

[Flat Six, inc.]

Pretty weird.....you've got me curious.

[Flieger]

Could you elaborate on the "quench area"?

I am curious about the function of this. Is it the relieved area near the valves and spark plug?

[edmayo]

Looks like heads that Michael Stimson has done for us (and others) They are in part based on lessons from 962 single plug race motors, that is providing a quench area to force the mixture towards the one spark plug, and yes his welding is so good it looks like it was built that way. He has also done a similar quench on some 914 heads for me.

[Flieger]

Thanks for the info Very interesting.

How much detonation protection is the quench area capable of? .25 point compression ratio increase maybe?

[BURN-BROS]

Looks like heads that Michael Stimson has done for us (and others) They are in part based on lessons from 962 single plug race motors, that is providing a quench area to force the mixture towards the one spark plug, and yes his welding is so good it looks like it was built that way. He has also done a similar quench on some 914 heads for me.

Ed, Love to see some pics if you have some. I'll clean up the heads some more. If they are welded I am very impressed.

[kenikh]

Super cool.

[911quest]

Do you have any pictures of the pistons? It would be interesting to see there design.

[sithot]

Looks like heads that Michael Stimson has done for us (and others) They are in part based on lessons from 962 single plug race motors, that is providing a quench area to force the mixture towards the one spark plug, and yes his welding is so good it looks like it was built that way. He has also done a similar quench on some 914 heads for me.

On the money.

Tom

[kenikh]

Piston shots?