first step is to remove the old freeze plug and accurately measure it, FREEZE plugs generally come in either zinc plated steel or BRASS, both work, but the steel deteriorates rapidly if you don't use a 50% mix of anti-freeze in the coolant.
Once you know the correct size you then visit the local auto parts store and buy both a BRASS freeze plug of the proper size and the correct sealant.
Personally Id buy a complete set of brass freeze plugs and replace as many as you can easily access if they are STEEL, with the far more durable BRASS VERSIONS and next time the engines out of the car Id damn sure replace the rest.
having a seal or bearing driver tool to seat the freeze plugs correctly after brushing sealant on the block and edge of the BRASS freeze plug is helpful
http://www.harborfreight.com/18-piece-seal-driver-kit-35555.html
the rear cam tunnel freeze plug?
theres two, sizes ON the SBC O.E.M. REAR CAM PLUG
1.23/32-inch expansion plug or the 1.47/64ths (cam plug)
or
the dorman catalog showed both plugs for 62-68 327 & 67 up 350's also.
plugs are roughly 1 5/8" on a O.E.M block sbc
the small one is dorman # 555-049.
1.and 23/32 o.d.,
the large one is 555-080.
1. and 47/64 o.d.
just be sure an measure the one you knock out or the hole it fits and use an accurate caliper
BTW you may find freeze plugs that look like this on blocks and cylinder heads, especially from engine rebuilder machine shops, the "exterior outside BUTTONs are made from a very special low melt metal like bismuth thats specifically designed too melt and distort if the blocks coolant temp reaches about 250-260F indicating and proving beyond question that you over heated the engine and voided your warranty
http://www.silver-seal.com/category/shop.1_cylinder_head_rebuilding.2_heat_tabs/
http://www.engineheattabs.com/products
btw torque converters are frequently painted with a very special paint that changes color at a specific temperature for the exact same reason, proof you voided the warranty and failed to run the transmission fluid thats supposed to act as a lubricant and coolant within the designed temperature range, they did not select the pink or purple because they like the color, its done to reduce warranty cost issues , if you over heat the converter its waranty is void
https://www.paintwithpearl.com/shop-custom-paint/temperature-changing-paint/
https://www.paintwithpearl.com/shop-custom-paint/temperature-changing-paint/
http://garage.grumpysperformance.co...sion-and-oil-cooler-increases-durability.176/
http://garage.grumpysperformance.co...n-cooler-info-and-derale-trans-cool-pans.662/
http://garage.grumpysperformance.co...ans-cooler-on-a-c4-corvette.10514/#post-44478
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