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Engine blocks #2795913 07/12/20 06:35 PM 07/12/20 06:35 PM
Joined: Jul 2004 Posts: 4,732 Watertown, WI MikeyT OP master
MikeyT OP master Joined: Jul 2004 Posts: 4,732 Watertown, WI	Hi all, I am going to look at a bare 1975 400 block that a guy has for sale. Is there anything I should look for or rather look out for when inspecting it? Thanks all Mike 1969 Dodge Dart Swinger

Re: Engine blocks [Re: MikeyT] #2795916 07/12/20 06:52 PM 07/12/20 06:52 PM
Joined: Feb 2015 Posts: 2,070 CA C crackedback top fuel
crackedback top fuel C Joined: Feb 2015 Posts: 2,070 CA	Cracks in the mains/main web from the oiling holes headed up towards camshaft

Re: Engine blocks [Re: crackedback] #2795922 07/12/20 07:13 PM 07/12/20 07:13 PM
Joined: Nov 2015 Posts: 873 Missouri J jwb123 super stock
jwb123 super stock J Joined: Nov 2015 Posts: 873 Missouri	Since I guess you can not sonic check it for thickness, I like to look at the boss where the cam bearings are machined. If the boss is off to one side compared to the actual cambearing hole, I suspect casting shift, and would have it sonic checked before using. Their used to be a number cast into the block that told how many times the mold had been used. The idea was the lower the number the less likely core shift was, but I never had much luck with it working out.

Re: Engine blocks [Re: jwb123] #2795933 07/12/20 08:04 PM 07/12/20 08:04 PM
Joined: Jul 2004 Posts: 4,732 Watertown, WI MikeyT OP master
MikeyT OP master Joined: Jul 2004 Posts: 4,732 Watertown, WI	Originally Posted by jwb123 Since I guess you can not sonic check it for thickness, I like to look at the boss where the cam bearings are machined. If the boss is off to one side compared to the actual cambearing hole, I suspect casting shift, and would have it sonic checked before using. Their used to be a number cast into the block that told how many times the mold had been used. The idea was the lower the number the less likely core shift was, but I never had much luck with it working out. So look down the block and eyeball for shifting in where the call goes in, to see if it is not true or not? Ok, got it? Crackback - Thanks, I was going to look around oiling holes and webbing for cracks Thanks! Mike 1969 Dodge Dart Swinger

Re: Engine blocks [Re: MikeyT] #2795974 07/12/20 09:41 PM 07/12/20 09:41 PM
S Superfreak Unregistered
Superfreak Unregistered S	Check for any visible cracks or gaulling in the cylinders and how much of a ridge at the top of the cylinders.

Re: Engine blocks [Re: ] #2795981 07/12/20 10:00 PM 07/12/20 10:00 PM
Joined: Jan 2004 Posts: 8,233 fredericksburg,va C cudaman1969 master
cudaman1969 master C Joined: Jan 2004 Posts: 8,233 fredericksburg,va	If it has a big ring grove, means the block had a long life with no issues.

Re: Engine blocks [Re: cudaman1969] #2796029 07/13/20 01:42 AM 07/13/20 01:42 AM
Joined: Aug 2003 Posts: 43,096 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,096 Bend,OR USA	Originally Posted by cudaman1969 If it has a big ring grove, means the block had a long life with no issues. The big ring ridge means to me it was driven around town a lot and never got warmed up, cold motors wear, warmed up motors wear a lot less Most of the motor home blocks I've look at with over 40,000 miles on them had no visible ring ridge in them, same thing on my old Ute Liner 26 ft. class A motorhome powered by a IH392 C.I. V8 with 70,000 miles on it when I got it hot due to bad gas and cracked both heads an hurt two pistons, no ring ridge Last edited by Cab_Burge; 07/13/20 01:46 AM. Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

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