Author Topic: 74 CV21  (Read 5845 times)

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Offline cv-19

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Re: 74 CV21
« Reply #40 on: May 17, 2017, 09:39:33 PM »
  Still has the original style nylon tooth timing gear on it.  Not a lot of piston choices for the Olds motors. The factory heads all have about the same 78-80 cc and compression is achieved from the pistons. Edelbrock alum. heads are 77 cc not much different. There is another alum. head brand that is cheaper , don't know what cc they are. Pistons range from the low comp. 8.1 to the higher range of 9.75. Olds uses a dished piston ,they do make special ones that have flat top and domed but that's too much compression for pump grade gas. Let me know if you find a 9.1 . You can run more compression with  alum. heads. Did it have a oil windage  tray at the oil pump?

Offline cv-19

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Re: 74 CV21
« Reply #41 on: May 18, 2017, 12:35:31 PM »

 windage tray pict.

Offline GIL_CV21

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Re: 74 CV21
« Reply #42 on: May 18, 2017, 07:18:40 PM »
Hey Glenn , it didn't have a windagetray its your garden variety 455 car motor . The original motor would have been a 73 or 74 with the ka heads , this one is a 70 , obvious whoever had it turned that one into junk . I'm gonna stick it out with this one , there are a couple of aftermarket aluminium heads out there with pretty small chambers , im still looking into them . I wanted to just get this pig running half way decent while i build a real motor but its not looking like that now . So if all goes according to plan im hoping to get it above 400 hp maybe more  , so if i see the tach hit better than  5050 rpm with an "A" impeller i'll know i am over 400 .

Offline cv-19

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Re: 74 CV21
« Reply #43 on: May 18, 2017, 08:16:56 PM »
 The high performance motors had the windage trays . Does it have the oil cooler on it? I am interested in how it does with the better exhaust manifolds that you have than the factory ones . Not the old  Barr ones in your picts.

Offline GIL_CV21

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Re: 74 CV21
« Reply #44 on: June 07, 2017, 06:16:05 PM »
The engine parts are startin to trickle in , just got the forged H beam rods , timing gears and chain , the forged flat top pistons are on a truck somewhere on their way here . I had the machinist sleeve number three, that way  im keeping the bore to .030 over , as soon as he gets the pistons he'll finish the boring and honing . I'm having him assemble a short block with oiling modification , crank and pistons then i'll finish it .
 



Offline cv-19

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Re: 74 CV21
« Reply #45 on: June 08, 2017, 05:20:46 PM »

  Nice job! I see you are selling the old heads so you must be going with the alum .ones . With flat top pistons you will be about 11.5 comp. ratio . You will need special gas or octane boost for it.

Offline GIL_CV21

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Re: 74 CV21
« Reply #46 on: June 08, 2017, 05:47:12 PM »
  Nice job! I see you are selling the old heads so you must be going with the alum .ones . With flat top pistons you will be about 11.5 comp. ratio . You will need special gas or octane boost for it.
They're almost flat top +12 cc it should be around 10.2 with the thicker head gasket  I hope lol .

Offline GIL_CV21

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Re: 74 CV21
« Reply #47 on: July 19, 2017, 05:45:06 PM »
The motor is going back together , the only parts that are original are the block and crank . I guess a mild freshin up went out the window .



















Offline Hyperacme

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Re: 74 CV21
« Reply #48 on: July 19, 2017, 05:52:42 PM »
Nothing ever easy ... Or CHEAP !
LOL
Lookin' GOOD !
Gregg
'76 CV16

Offline GIL_CV21

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Re: 74 CV21
« Reply #49 on: July 30, 2017, 07:31:45 PM »
 I am almost ready to paint the engine , spent a good part of the day today messin with the push rod guide plates to get the roller rockers to ride across the center of the valves , it took some time but worked out well . I installed the timing chain cover , water pump and the fuel pump , keep in mind you have to clearance Edelbrock heads where the fuel pump mounts . I have to either buy tall valve covers or buy 1/2 inch spacers for my stock covers too fit over the rocker studs more money lol.












































[/quote]

Offline cv-19

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Re: 74 CV21
« Reply #50 on: August 01, 2017, 09:00:13 AM »

    Looks GREAT Gil !     Noticed the fuel pump and wanted to let you know that the center small line on that pump
   
       always has fuel pressure ,its a return line to the gas tank on cars. The original pumps had a vent line in case of a diaphragm rupture to the carb. Cant use the pump you have for that purpose. I did it years ago and still have the pump I couldn't use. Have never been able to find an original style Berkeley style fuel pump for the Olds.
       

Offline GIL_CV21

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Re: 74 CV21
« Reply #51 on: August 01, 2017, 05:41:23 PM »
Thanks Glenn , im glad you pointed that out before i tried to fire it , i was just gonna run it to the fuel over flow tube on the carb . that could have ended badly . Gil

Offline cv-19

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Re: 74 CV21
« Reply #52 on: August 01, 2017, 09:06:31 PM »
 
  Search 455 Olds fuel pump  Performance Boats. Check out the article.

Offline cv-19

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Re: 74 CV21
« Reply #53 on: August 03, 2017, 07:18:34 AM »

 This baffle is good to keep the hot oil off the bottom of the intake manifold when using the fiber intake gaskets.
 They ( Mondello) say not to use the original steel style ones on alum. heads and manifolds cause they will leak
 
             
.

Offline cv-19

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Re: 74 CV21
« Reply #54 on: August 03, 2017, 07:24:19 AM »
 
  It bolts right in where the small original one is, cost about 40 dollars.

Offline GIL_CV21

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Re: 74 CV21
« Reply #55 on: August 04, 2017, 05:16:48 PM »





Online Plugcheck

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Re: 74 CV21
« Reply #56 on: August 04, 2017, 06:27:22 PM »
Very pretty, I hope your engine finish stands the test of time.    I see your running HEI dizzy, will it work as a centrifugal advance only, to provide the correct curve?  I just noticed the vac advance, something I don't see operational very often on boats.  Come to think of it, never seen a marine dizzy with vac advance, must be my first.
Michael
1979 CVZ-18 388 CI Vortec Mouse
1980 CVX-16SS 140 Mercruiser
1979 CVX-16 Johnson 175
2002 Bennington 2275CC 90 Mercury
1985 Intimidator project, gps 85 mph (on trailer)
1989 Lowe 200 Redneck fishin Toon

Offline cv-19

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Re: 74 CV21
« Reply #57 on: August 05, 2017, 11:34:49 AM »

 All the Berkeley Packajets with the 455 Olds had vacuum advance . They were different and also used a water pump instead of a block off plate. I read the reason was to make sure the engine block was full of water at low speeds.

Offline cv-19

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Re: 74 CV21
« Reply #58 on: August 05, 2017, 11:38:03 AM »
 
 The pictures and info. are out of a Berkeley manual .

Offline cv-19

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Re: 74 CV21
« Reply #59 on: August 05, 2017, 12:37:48 PM »

  Gil,

   If you have trouble with the pulleys lining up wanted to let you know the non a/c water pump is shorter than the a/c pump.