Read that there is an additional oil MOD for my 401 Block.
Incorporates Drilling a new oil passage from main cap to lifter oil passage, mirroring current factory design.
Basically rerouting oil feed to Mains from other side lifter passage.
Purpose of oil from the thrust side of rotation and mains are fed more efficiently from this MOD.
I MFG a sturdy jig brace for drill bit alignment.
Jig for bit has maybe 001-0015" Clarence so this should be sufficient keeping bit aligned..
Any advice or experience in performing this MOD?
thx.
Oil MOD reroute to mains
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1978J10REDWHITE
Topic author - Posts: 263
- Joined: Fri Nov 20, 2020 7:25 pm
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devildog80
- Posts: 1124
- Joined: Wed Apr 13, 2022 2:41 pm
- Location: Apache Junction AZ
Re: Oil MOD reroute to mains
Have read this is not needed on a DD. Only for some level of building a racing engine as rpm's are higher?
'81 CJ5 Base, 258 I6, MC2100, T176 4 spd, 300 TC, D30 Front NT, 3.31, 2-Piece AMC 20 rear NT, 3.31, 4" high arc spring lift
'84 Grand Wagoneer, 401 V8 (.030 over), Edelbrock clone 1406, 727 auto, Selec-trac NP229, AMC 20 REAR - D44 FRONT - WT 3.31, 4" high arc spring lift
Rather be driving, than waiting to be modified
'84 Grand Wagoneer, 401 V8 (.030 over), Edelbrock clone 1406, 727 auto, Selec-trac NP229, AMC 20 REAR - D44 FRONT - WT 3.31, 4" high arc spring lift
Rather be driving, than waiting to be modified
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tgreese
- Posts: 7195
- Joined: Fri Jun 08, 2012 6:31 am
- Location: Medford MA USA
Re: Oil MOD reroute to mains
This was my understanding too.
There are many links on IFSJA regarding this topic: https://www.bing.com/search?q=site%3Aif ... on+upgrade
Also on the AMC forum: https://www.bing.com/search?q=site%3Ath ... on+upgrade
There are many links on IFSJA regarding this topic: https://www.bing.com/search?q=site%3Aif ... on+upgrade
Also on the AMC forum: https://www.bing.com/search?q=site%3Ath ... on+upgrade
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 Chryco Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 Chryco Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.
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1978J10REDWHITE
Topic author - Posts: 263
- Joined: Fri Nov 20, 2020 7:25 pm
Re: Oil MOD reroute to mains
One thing I known since the 70's, was a deeper oil pan & P/U tube, for a better vol of oil and keeping it "CLEAN" and filter fresh is the life blood on all machinery.
Especially engines.
Not once ever in 55+ years had one single oil related issue on any engine I owned.
And I overworked my engine routinely daily.
Race & street cars always had deep (or side of pan box added) oil pans & tubes I MFG my own, and will do on this one.
I ponder how many issues like 'mains bearings' we hear about , on these forums have, issues rooted in poor oil & filter maintenance caused-induced?
In stock form AMC V8's oil properly.
With modern knowledge about clearances done right, main line hone machining, the Mid plate design, Plus the advent of superior oil chemistry.
There is enough going for the design as is.
Especially engines.
Not once ever in 55+ years had one single oil related issue on any engine I owned.
And I overworked my engine routinely daily.
Race & street cars always had deep (or side of pan box added) oil pans & tubes I MFG my own, and will do on this one.
I ponder how many issues like 'mains bearings' we hear about , on these forums have, issues rooted in poor oil & filter maintenance caused-induced?
In stock form AMC V8's oil properly.
With modern knowledge about clearances done right, main line hone machining, the Mid plate design, Plus the advent of superior oil chemistry.
There is enough going for the design as is.