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11-16-2017, 03:11 PM
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#1 |
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Registered User
Join Date: Jan 2003
Location: Safford,AZ
Posts: 3,613
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Engine for our 1969 GMC
So our 1969 gmc hasn't ran in about 10 years and I ran across a deal I couldn't pass up. It is an engine and transmission out of a motorhome (350) with 31,000 original miles:
Complete from air cleaner wing nut to oil pan drain plug. Built April 1976 010 block 991 heads th350 Going in: 1969 GMC 2wd all new hd suspension 31x10.50r15 tires 3.73 rear axle So the questions- This engine appears to have low performance (duh) and small valves. I was thinking of using the XE256 from comp cams in it to boost performance (I already have the cam and lifters- new) New heads are not an option, I'd rather run it as-is. Maybe run headers? already have them off a parts truck as well, or maybe rams horns for original look? Last edited by Warrens69GMC; 11-16-2017 at 05:20 PM. |
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11-16-2017, 04:36 PM
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#2 |
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Registered User
Join Date: Sep 2011
Location: Ark City, Kansas
Posts: 3,280
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Re: Engine for our 1969 GMC
If the engine only has 31,00 on it, I'd run it as is.
Valve cover, oil pan gaskets. The first thing you might do is pull the intake to install new intake gaskets.Doing so you will be able to see the top of the engine, and most importantly it's condition. Hopefully it's clean. AND you'd be able to look at the cam to see if you have any flat lobes, or any going that direction... I'm no fan of XE cams, at all. I'm not familiar with 991 heads. Are there any other numbers on the heads??? |
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11-16-2017, 04:38 PM
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#3 |
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Registered User
Join Date: Jan 2003
Location: Safford,AZ
Posts: 3,613
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Re: Engine for our 1969 GMC
3998991 casting for heads
Last edited by Warrens69GMC; 11-16-2017 at 05:19 PM. |
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11-16-2017, 04:39 PM
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#4 |
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Senior Member
 
Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: Engine for our 1969 GMC
Good cam and a good choice for a stock 350. Rather than use the red syrup assembly lube that comes in the kit I like to use this instead. https://www.speedwaymotors.com/Isky-...YaArL7EALw_wcB It's a moly based peace of mind that the cam will live through the break-in procedure. Follow the beak-in procedure to the letter as well as use a quality break-in oil during the break-in...
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Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property"  "Be American, Buy American" 
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11-16-2017, 05:10 PM
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#5 |
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Senior Member
Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: Engine for our 1969 GMC
Apparently we're talking 307 cubic inch motor here...? I've no experience with the 307 so I retract my upper comment. I seen the 010 block and assumed a 350. Now with that said, that may be a very good motor regardless of the cubes. If that thing came out of a motorhome it may be a 4-bolt main block. heres a couple of links http://www.73-87.com/chevy_ids/sbheads.htm
http://nastyz28.com/threads/991-head...-or-no.213869/
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Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American"
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11-16-2017, 05:18 PM
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#6 |
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Registered User
Join Date: Jan 2003
Location: Safford,AZ
Posts: 3,613
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Re: Engine for our 1969 GMC
its a 350, the 307 was the original motor in the GMC (long gone)
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11-16-2017, 05:33 PM
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#7 | |
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Senior Member
Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: Engine for our 1969 GMC
Quote:
__________________
Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American"
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11-16-2017, 06:04 PM
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#8 | |
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Registered User
Join Date: Jun 2009
Location: COOKEVILLE,TN
Posts: 144
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Re: Engine for our 1969 GMC
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11-16-2017, 06:18 PM
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#9 |
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Registered User
Join Date: Jan 2003
Location: Safford,AZ
Posts: 3,613
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Re: Engine for our 1969 GMC
no 4 bolt main 307. AFAIK the 4 bolt main is 350 up in a gen 1 engine SBC
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11-16-2017, 06:49 PM
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#10 | ||||
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"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,921
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Re: Engine for our 1969 GMC
Those crap small valve heads did find their way onto a handful of 350's from the factory. Mt stepson got a 1975 350 out of a trashed C30 and it has the same heads. Valves are only 1.72's. I'd start looking for different heads as they are going to be the limiting factor to ANY "performance" upgrade.
Is the block casting number 3970010? Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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11-16-2017, 09:11 PM
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#11 | |
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Registered User
Join Date: Jan 2003
Location: Safford,AZ
Posts: 3,613
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Re: Engine for our 1969 GMC
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11-16-2017, 10:01 PM
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#12 | ||||
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"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,921
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Re: Engine for our 1969 GMC
Even with smogger 1.94 heads you could easily make a respectable 300hp.
Gary
__________________
'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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Quote:
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