Production class engine rule

[Sumner]

...........  However, before I went down a buy and build path for the 250 I-6, I wanted to be on firm ground.  I'm thinking I should email the ECTA Tech guys for an interpretation........

Yes I would do that as I've just been expressing an opinion and I'm not familiar with the engine you are talking about like I am a sbc,

Sum

[Rick Byrnes]

Mark
In your first contact with Tech guys (Joe Timney), provide if you can, exactly the similarities between the two displacements.
I know some of them, but not having built a 250, cant be specific.  I thought, (perhaps wrongly) that the block castings were the same.  The engine design community viewed that engine as a stroked 200.  I think the engines were produced on the same machining and assembly lines at Lima Engine Plant although that was a little before my time as I started with Ford in 69.
Do provide lots of dimensions, pictures, production figures and availability. 
With respect to the crossflow head, that may be an entirely different deal since the base engine design was u flow with that silly intregal intake manifold.  (talk about cost and complexity reduction).
Good luck

Rick

[panic]

The 250 block is a very different casting, as I said "wider and taller with a different bellhousing", and a non-interchangeable crank.
Deck height: 7.808" vs. 9.469".
It's not a stroked 200, it's another evolutionary stage in the series with less retro-fit than for example 144>170, 170>200, etc.
More evolutionary stages? There are OHC versions also.

Again: if anyone responsible for these things actually wants more information there are a few bits of data that I will be most happy to contribute (and I'm sure others as well).
I have some interchange data here (additions and corrections welcome):
http://victorylibrary.com/mopar/m-table.htm

[Cajun Kid]

May I please ask what kind of wheels are on Paul's Falcon Pickup?  They look like American Racing Aluminum Wheels ?  If that is the case how does he fit 1" hex lug nuts on them?  I want to run American Racing Salt Flat Wheels, they too are aluminum?  For under 175MPH  can I use 13/16 lug nuts on 1/2" studs ?

Charles

[revolutionary]

If you need pix of an Aussie crossflow head for rules clarification, I have one at my shop that's been sitting around for a while.  It is actually a really nice design with intake runners raised significantly.

[wolcottjl]

May I please ask what kind of wheels are on Paul's Falcon Pickup?  They look like American Racing Aluminum Wheels ?  If that is the case how does he fit 1" hex lug nuts on them?  I want to run American Racing Salt Flat Wheels, they too are aluminum?  For under 175MPH  can I use 13/16 lug nuts on 1/2" studs ?

Charles

If I remember correctly - You don't need 1" lug nuts unless you are over 200, have a tire over 29" in diameter or a wheel over 17".  For aluminum you need to have a steel plate or heavy duty steel washers between the lug nuts and the wheel. 

[markwill]

Thanks Rick and Panic. 

You've given me some great advice and food for thought.  It's an interesting process to go through when you starting taking the steps from bench racing, to participating, to getting dog gone serious about running for a record.  Makes picking "the right" category and class a wee more significant. 

Thanks again.

[Cajun Kid]

Wolcott,  Thanks,, I just found that same info in the 08 rule book.
See you in April?

[wolcottjl]

I should be there with a little VW pickup.  Pick up the freshly bored block from the machine shop tomorrow.  See if we can build and tune a motor in a week.  No rush. 

[Cajun Kid]

Wolco,  good luck on the build...Hope you get'er built and tuned well enough to make a few passes. My Vicky will not make the April meet.  The crank is still not here. We have about 150 hours of work left.. Depending on weather and chase vehicles (my posse)  I will either drive up with the crew or bring my 39 chevy and try to make my rookie license runs in it.

Take care see you in a week or so.

Charles