Can someone varify that the rear most manifold stud does indeed go into a coolant passage. I had a bit of a fast drip from that and I removed the stud and put sealer on it and now it sprays across the engine compartment. Will the water pump produce that much pressure. The engine is dead cold and starts spraying the second its started. This is also the one that needed a HeliCoil which I think threaded its self way to far in after reinstalling the stud.

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir

Yes & Yes
It is time to replace the Helicoil, this time you may want to epoxy it into place.
DD

Yes, I had this happen to me as well a couple of months back after engine break-in. It blew clear across the car and messed up the gasket. I had to seal it up good. The Aussie gaskets are coming.......and all studs will be resealed. My helicoil is secure.

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

I had Loctited the Heicoil when I orignaly installed it. I seem that it didn't "take". Threaded another one in with sealer on it and then the stud with sealer on it. Leak has stopped.
Thanks for the input.

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir

I had water coming out of the rear valve cover bolt closest to the rear manifold stud on my original 170 engine. Must not be much meat between the water passage and those threads for either stud/bolt.

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'63 Valiant V200 Convertible
225 Aluminum Block

I had this same problem on a 273. It will be hard to seal without getting it totally clean first. I ended up removing the helicoil, cleaning out the hole and putting in a new insert with sealer and then letting it sit overnight before putting the coolant back in. I put a spacer and nut on the stud and torqued it so it had a load on it while drying and would hopefully not squeeze out the sealer later. I cannot remember what sealer I used, but I think it was JB weld epoxy. Before that I had tried aviation permatex and silicone.

Helicoils are not meant to be used with retaining compound or sealer. If there is enough material and access it might be easier to permanently solve the problem with a larger, solid type of insert that can be sealed easily on both the inner and outer threads.

Another option is the leakstop GM sells. It works well and will not clog up the whole system like just about every other radiator sealer I have seen. It is tablets that dissolve into powder and is a factory installed item on Northstar engines. It is mostly made of ginger.

Waitjustaminit! GM installs stop leak as factory fill! Now THAT speaks volumes!

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David Kight
'62 Valiant Signet, White
'98 Dodge Dakota
'06 Jeep Liberty

Growing older is unavoidable but growing up is strictly optional.

Sorry to interupt. What is a Helicoil? Maybe a pic?

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82 D150 Slant6 Shorty
http://www.cardomain.com/ride/658846

A helicoil is a repair device, it looks a bit like a coil spring and is used to repair stripped and damaged threads. The hole is tapped out, the helicoil thread in and staked down.

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David Kight
'62 Valiant Signet, White
'98 Dodge Dakota
'06 Jeep Liberty

Growing older is unavoidable but growing up is strictly optional.

I can imagine your frustration when it started... one time I was adjusting manifolds and I observed a drip from the middle stud that formed a poodle on the middle of the intake and I almost $#!+ my pants...

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.