Re: My 1968 C-20 Golden Anniversary Project
5 Attachment(s)
Disassembled.
Found some small metall particle below the camshaft. All others without issues. |
Re: My 1968 C-20 Golden Anniversary Project
5 Attachment(s)
Block cleaned with air gun and petroleum, this works realy good.
|
Re: My 1968 C-20 Golden Anniversary Project
5 Attachment(s)
Found out that the cam is grind (casting number) 930. The GM # is 3896929.
Overlap 90° Rocker ratio 1.5 Intake timing Opens BTC: 38° (BTC= Before top dead center) Intake timing Closes ABC: 92° (ABC= After bottom dead center) Lift .3900" (with 1.5 rockerarm, means lift on the cam is less) Exhaust timing opens BBC 88° Exhaust timing closes ATC 52° Lift .4100" (with 1.5 rockerarm, means lift on the cam is less) Duration 320° In my service and overhaul books 1968 327 the lift for inlet and outlet are the same, strange. camshaft journal ok (1.8682-18692"), surface ok |
Re: My 1968 C-20 Golden Anniversary Project
5 Attachment(s)
Cam bearings cleaned and checked, ok
|
Re: My 1968 C-20 Golden Anniversary Project
5 Attachment(s)
Cam assembled, crankshaft bearings cleaned and inspected.
Marking on bearing:GMM420 57653 244J3 Marking on thrust bearing: 001 170d7 B GMMA 57871 |
Re: My 1968 C-20 Golden Anniversary Project
5 Attachment(s)
More pictures
|
Re: My 1968 C-20 Golden Anniversary Project
5 Attachment(s)
New rear main seals (FEL-PRO P2900) prepared and oil filter adapter installed.
Marking on old rear main seals: BRUMMER 474 |
Re: My 1968 C-20 Golden Anniversary Project
5 Attachment(s)
Cover for the timing gear cleaned and prepared.
Marking on the old seal: 3980267 SDI |
Re: My 1968 C-20 Golden Anniversary Project
5 Attachment(s)
Some measures with the crank shaft:
4577 327 62-67 Truck small Journal 2.30“ main Journal x 2.00“ Rod Journal x 3.25“ stroke. Assuming the GM part number is # 3889304. The 4577 crankshafts were in my opinion over the counter production (my engine is a guarantee short block "CE". |
Re: My 1968 C-20 Golden Anniversary Project
5 Attachment(s)
Some piston measurements.
Piston 3796494 (GM 3816974) They are 62-8 Chev. H.D. Truck, low compression, recessed head .085 x 3.125, 8.0:1 compression. They have a steel insert cast into the top ring groove (armored groove) These pistons are a cast piston. Piston Rings changed against Sealed Power Performance Ring Set E-251K: 5/64 x 5/64 x 3/16 (in.) groove widths. Steel top ring. Grey iron with phosphate coating 2nd ring. The top ring is a plain ring. Unlike Hastings and others. No markings. Installs either side up. Second ring has a dot on top side. |
Re: My 1968 C-20 Golden Anniversary Project
5 Attachment(s)
Oil pump pressure set to "stock"
|
Re: My 1968 C-20 Golden Anniversary Project
5 Attachment(s)
Today tried to assemble. Got a reverse. In the overhaul book is written:
327 11/32-24 connecting rod cap 35 ft lbs 327 7/16-14 main bearing cap 80 ft lbs Tried the main caps, after 70 ft lbs I got a bad feeling, stopped. tried 35 ft lbs on the rod bolt , 30 ft lbs ok than the bolt would be longer and longer and longer :(:(:( Now ordering new ARP bolts and try again |
Re: My 1968 C-20 Golden Anniversary Project
5 Attachment(s)
Finished timing gear cover,
chain play new timing gear from 1968: in: 3.868"; out: 3.541" Lesson learned: It is not necessary to remove the "half moon" key in the crankshaft but was a good training. :smoke: |
Re: My 1968 C-20 Golden Anniversary Project
4 Attachment(s)
some more:
|
Re: My 1968 C-20 Golden Anniversary Project
5 Attachment(s)
After I got the right washers, finished the valve and spring assembly heads.
Installed height between 1.725" and 1.730" (origin is 1.750"). Valve pressure measured by 1.750" = 132 ft lbs. , second measurement after movement of the spring: 126 ft lbs. and third measurement after further movement of the spring 121 ft lbs. Valve pressure measured by 1.730" = 130 ft. lbs. seat pressure Valve pressure measured by 1.725" = 132 ft. lbs seat pressure (The Summit 174000 valve spring kit has the following pressures.Seat Pressure at Installed Height 1.750" (lbs):125 lbs. Open Pressure (lbs):325 lbs.) |
Re: My 1968 C-20 Golden Anniversary Project
5 Attachment(s)
Some more:
|
Re: My 1968 C-20 Golden Anniversary Project
5 Attachment(s)
I ordered the wrong set kit SUM-174001 get seals for 0.307 in. Valve Guide Diameter (in): 0.485 in.
Than I ordered the set for the right valve diameter SUM-174000 0.344 in. (11/32), but the Valve Guide Diameter (in): 0.530 in. instead of my 0.560" Than I ordered additional seals by Alex parts: .520"- .565". In my opinion all three different seals are the same. Lesson learned, read exactly "before one click buy". |
Re: My 1968 C-20 Golden Anniversary Project
3 Attachment(s)
Suffered the next defeat. My block is Chevrolet small block 2-Bolt Main, small journal, therefore I ordered the ARP-134-5002 Kit.
To short- assuming that the CE (service replacement/warranty engine, casting # 3959512) was prepared as small and big journal to provide solutions for all guarantee cases? |
Re: My 1968 C-20 Golden Anniversary Project
5 Attachment(s)
Continue!
|
Re: My 1968 C-20 Golden Anniversary Project
5 Attachment(s)
Some more
|
Re: My 1968 C-20 Golden Anniversary Project
5 Attachment(s)
Fuel-,oil pump and cylinder heads
The small plastic bushing in my opinion don't needed if you have an oil pump shaft with a guide (both in picture 1). Copper oil pump gasket SUM-111480, in my opinion normally not needed, but can't hurt. |
Re: My 1968 C-20 Golden Anniversary Project
1 Attachment(s)
Head bolts ARP #134-3701 (12-point)
16 pcs 1.750" UHL 04 pcs 3.060" UHL 14 pcs 4.180" UHL Working perfect. Torque: 70 ft lbs |
Re: My 1968 C-20 Golden Anniversary Project
4 Attachment(s)
Preparing rockers, pushrods etc.
Despite I ordered the same part number EPR 34B (8 pcs. each) twice I received two different lengths pushrods=== TIME DELAY!!! Lesson learned: Always order one complete set. Right length 7.794“ Wrong lenght: 8.544“ Time for preparing accessoiries. |
Re: My 1968 C-20 Golden Anniversary Project
4 Attachment(s)
Preparing valve covers.
Grommets are perfect: PCV Valve grommet 42052 Dorman and/or WVE 2P1006 |
Re: My 1968 C-20 Golden Anniversary Project
That's gonna be a nice engine!
|
All times are GMT -4. The time now is 03:43 AM. |
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com