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Yes, you need BIG ones. Wished I had a motor that needed a 3 inch system, yes, get some purdy ones. I'm jealous ....

Got it, will go with that, thanks....

Guys, I obtained a used motor 440 from a drag racer downsizing his garage clutter. On closer inspection I found a least 8 heli coils installed where exhaust studs would have been. I assume they were removed to assist with the install/removal of headers. In looking at the coils I would not trust...

Thanks Mark and Trench. I think I have a lead on the 3751071 right side and am still looking for either the 3751068 or 3671595. With yall s help I now know what I'm looking for.

Thanks T2, thats what I am learning....so to find what will.

68 HP casting are what I have. I have a 76 stock motor with castings, would that late be clocked the same.....no? Not sure what years my other two 400s are.....

Apparently not. I looked at the ones I have and they are not the castings you gave. Just wondering if any of what I have will work. I know they will all bolt up, but wondering if the angles at the manifold-tailpipe bolt up are all the same.

Thanks Guys, Mark, I have a brand new stock pipe exhaust system and so I wish to ensure my manifolds will bolt up BEFORE I drop in the motor. Just easier on this old bod to change them with the motor out...

Guys, bought a new stock exhaust system for my 73 440. Now I am concerned that the HP manifolds I plan to use may not fit up with the stock pipes. I have a set from a 76 that I am wondering if they might fit better. I guess I m asking what all manifolds have the same turn out angles that would...

My Time Sert kit arrived today and it was real simple to get insert and stud installed. Got it sealed and feel it went well and hopefully no problems down the road. Waiting on new oil pan from 440 source and then will oil prime the motor. Got an engine run stand that hopefully can be modified...

Ok, I found a "reducing stud" , 7/16-14 by 3/8-24 the same length as stock studs. The drill for the 7/16 is a "W", which is just a few thousandths different from whats needed for a Time Sert . The Time Sert 3/8 kit is $80 bucks. I am thinking that in using the reducing stud would eliminate...

I am looking into these Time Serts. I have put in several heli coils from a kit purchased and had great results .....but not in a water jacket. It just appears way to pourus to hold back pressurized hot coolant to me....even with the best sealant I could find. Will check with my NAPA store here...

Guys, my machinist kinda left me hanging on this one. Took in a set of bb heads for rework and ask him to repair a broken off exhaust stud , one on the end in the water jacket. He only drilled out the broken stud.Loading up everything I forgot to check, so just found it on assembly day. So, do...