John,
For the conversion, your article calls out 1/2" drilled and pipe tapped holes for the 3/4" nipples. I hope this is a typo. Should it be 3/4". I'm pretty sure I know the answer, but I thought I'd point it out so it can be corrected. Thanx for the great info.



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Bob '89 Ram Air Formula 350

And until that time when death won't wait, let each man rage against his fate. (O'neill)
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Nope, no typo. Maybe I can make it clearer though.
I did use 3/4" heater nipples(as short as possible-NAPA). That dimension is not the thread size, it's the O.D. of the fitting. The thread size is 1/2"-14 NPT.
I drilled and tapped for a 1/2"-14 NPT but do not drill a 1/2" hole. I drilled a 23/32" hole before tapping.

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86 Camaro Sport
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Thank you sir...

[This message has been edited by RCR (edited November 13, 2001).]