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#1 | |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: 66 C10 sbc 400 compression issue.
I hate to say it, but it sounds like you have a cam lobe going flat.
Quote:
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#2 | |
Registered User
Join Date: Feb 2009
Location: southeasternfoothillsofusa
Posts: 1,557
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![]() Quote:
![]() YMMV, sam |
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#3 |
Registered User
Join Date: Jan 2013
Location: Muskogee ok
Posts: 32
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Re: 66 C10 sbc 400 compression issue.
So my first thought was I steal had anti freeze or bad oil steel in the system.
I shut her down and changed the oil with new oil filter (This time I used 10/40) (The first time I used 10/30) Within 5 mins or so the oil pressure was back down to 0 on the after market gauge. So Im guessing Iv got a bad cam and a few bearing on the way out. Ill get a test gauge tomorrow to make sure. If the gauge shows low oil psi - Ill pull the lower end and have the crank turn and all that good stuff. Ill also Pick up a new cam and bearing set. I wounder if the new oil pump could be having issues as well? |
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#4 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: 66 C10 sbc 400 compression issue.
If you do in fact have a cam going flat, the engine needs to be completely torn down and thoroghly cleaned. That is the only way to get all the metal particles out of the engine. If you do not, you run a good chance of this happening all over again.
When you do install a new cam, be sure to do some reading on how to properly break in a flat tappet cam, and also be sure to use a break in additive, and flat tappet cam compatable oil. The lack of ZDDP in today's oils is likely why the current cam went flat.......using the wrong oil. Of course running the engine with water and anti freeze in the oil probably didn't help.
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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#5 |
Registered User
Join Date: Jan 2013
Location: Muskogee ok
Posts: 32
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Re: 66 C10 sbc 400 compression issue.
Thanks guys.
Iv called the shops around here and I can get the crank turned with all new bearings and a new mid range cam with bearings and lifters for 300$ is this a good deal. I found a cam bearing tool for 30$s. Will this one work for my sbc 400? or are they pretty much unavailable. Here is the tool. http://www.summitracing.com/parts/aa...0/media/images Thanks guys. |
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#6 | |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: 66 C10 sbc 400 compression issue.
All small block cam bearings are the same size.
You're taking a huge risk in repairing your engine this way.......... Quote:
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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#7 |
Registered User
Join Date: Sep 2008
Location: San Carlos, Ca.
Posts: 3,048
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Re: 66 C10 sbc 400 compression issue.
X2. I hate to say it, but its back to square 1. On the positive side though, you should have a killer running engine when youre done if its done right. Take the time to do it correctly and right the first time around.
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Chris '63 k15 long step Vortec 7.4 - L29 Blackbear tune, Five 0 Motorsports injectors, Chris Straub Cam, NV4500, divorced 205 ![]() 52" front and 63" rear spring swap D44 / 14bff - disc axles Milemarker 9K and 10.5K hydraulic winches 63" & B52 Spring Install http://67-72chevytrucks.com/vboard/s...ng+swap+thread NV4500 Reverse Build Thread http://67-72chevytrucks.com/vboard/s...=reverse+build L29 - 7.4 Vortec Build http://67-72chevytrucks.com/vboard/s...&highlight=L29 |
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#8 |
Registered User
Join Date: Jan 2013
Location: Muskogee ok
Posts: 32
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Re: 66 C10 sbc 400 compression issue.
What am I doing wrong???
Im going to tear the engine down. Have the crank turned and matching bearings. Get a new cam with bearings and lifters. Have the block vatted. Start re-installing everything. |
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#9 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: 66 C10 sbc 400 compression issue.
All you said before was you were getting the crank turned, new cam and bearings.
Sounds like you are doing it right, but you forgot you will need new rings, and the cylinders will need to be honed. Plus all new freeze and galley plugs, all new gaskets, new oil pump, timing chain, etc.
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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#10 |
Registered User
Join Date: Jan 2013
Location: Muskogee ok
Posts: 32
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Re: 66 C10 sbc 400 compression issue.
The only thing Im not doing is have the cylinder bored. I going to reuse the pistons and rings. I dont have alote of money to work with... Id love to bore the cylinders but I dont see any piston sets for under 250 or cheaper.
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#11 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: 66 C10 sbc 400 compression issue.
You can not re-use the rings once they are taken out of the block. A set of cast rings is fairly inexpensive. A set of Molly rings is better if you can squeeze just a little more $$. There's no problem re-using the pistons as long as they are in useable condition.
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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