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Yesterday, 06:17 PM
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#1 |
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Registered User
Join Date: Jul 2005
Location: Edgewood, WA
Posts: 901
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Big block 402 help needed
I installed a new GM hei distributor in my 1970 402 suburban and now have no oil pressure. The hei is an upgrade from the points distributor which had oil pressure. The new one is definitely all the way down. It runs real good but definitely no oil pressure. The new distributor measures out the same as the old one length and diameter. Gear is pinned and I see no issues, but it is not driving the oil pump. I used a primer on the oil pump and it built pressure just fine. I have done this swap on several small blocks with no issues. Is there something I am missing for a big block application? Thanks for the help
__________________
67 C20/ 68 C10 stepside/inline 250--current project 71 GMC 4x4 70 Blazer project-Zombie assault vehicle 67 4x4 Burb 
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Yesterday, 09:53 PM
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#2 |
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Registered User
Join Date: Jul 2021
Location: Keller, Texas
Posts: 468
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Re: Big block 402 help needed
I wonder if the diameter of this section is too small and letting to much oil to bypass or maybe the groove is not located right and blocking the oil port.
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Darrell 1972 Cheyenne Super C20 (My Fun Drive) 2000 S10 Xtreme (My Drag Truck) |
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Today, 12:20 AM
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#3 |
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Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,555
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Re: Big block 402 help needed
Might pull and check the gear and the part that is supposed to engage the oil pump. Possible something got made wrong. QA isn't what it used to be.
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Today, 12:26 AM
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#4 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,629
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Re: Big block 402 help needed
Maybe you have a grooved cam bearing.
Info here. https://garage.grumpysperformance.co...engines.10360/ |
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