yanfoo

Hi, i need to have the exact size for this "cam Plug"...
the big one in the middle, yes it's leaking, found that out while doing my clutch.

i mesured 2.110" but if someone has the Exact size or better a part # from GM or autoparts, thanx... next week i may try engine rebuilt shop and the gm dealership...

thanks

RB83L69

2-7/64" (2.109375")

P-80-C or 555-080 ..... I keep a box of them in stock

yanfoo

:hail:
thanx for the quick reply, Now the fun part, taking it off...
any tips would be great, i've heard i just punch a hole and pry it out?
I will give it a shot monday.

Vader

A new plug avtually measures about 2.111" (becuase of the push fit). I don't think that size has changed since Christ was a baby, so you should be able to get any cam bore plug for an SBC and it will fit. Try to get brass, or paint the steel plug after installation.

With the cam installed, I'd be careful about drilling a hole anywhere but dead center. The plug is very thin, so usually you can tap one side inward and the other will tilt outward enough to enable you to grab it with pliers or a Vise-Grip and pull it out. Coat the perimeter of the replacement with gasket shellac or Permatex brown original sealant and install it.

RB83L69

Vader, actually back during the Peloponnesian Wars, the factory made them with 2-3/32" plugs. 265s and 283s up to about 59 or so had that size. The very first motor I ever built, I ended up with that size somehow, but the block actually needed the larger one (I think I had a 61 or 62 block). I got my first taste of beginning hot-rodder fun: build a motor, have it spew oil all over hell's half acre, take the transmission back out, silicone it ½" thick, discover that wasn't going to work because it still spewed oil, and take the transmission back out again and do it right. I was not real happy with that. At least the motor ran and didn't blow up.

I keep a box of those in stock too, just in case.

Vader

See. If I'm not careful, I CAN learn something every day. That must've been one of those "interim revisions", like the '68 main journal job and '69 cam timing adjustment, and the late '50s change away from all forged cranks, and the '73-'80 "How crappy can we make 'em run" philosophy...

Thanks for the tidbit.