Author Topic: 1974 455 olds overhaul  (Read 2577 times)

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Offline Klatt87

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1974 455 olds overhaul
« on: July 10, 2008, 08:02:26 PM »
Here is a 1974 455 olds we got for 100 bucks. Now we want to put this in my 78 trans am, originally a 400. Now I do not know a thing about motors, so from the pictures I can tell I need all the pulleys, water pump, new freeze plugs, new gasket set, new distributor and cap and everything. I want to do a new cam and lifters. And where can I get all this, from napa maybe? How many horses can you guys estimate this has? What do I need to do motor mount wise to get this in? Sorry about all the questions but I am just not a motor guy, I like body work. :)










Offline Joker (告r茺agon)

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Re: 1974 455 olds overhaul
« Reply #1 on: July 11, 2008, 01:59:09 AM »
Here is a 1974 455 olds we got for 100 bucks. Now we want to put this in my 78 trans am, originally a 400. Now I do not know a thing about motors, so from the pictures I can tell I need all the pulleys, water pump, new freeze plugs, new gasket set, new distributor and cap and everything. I want to do a new cam and lifters. And where can I get all this, from napa maybe? How many horses can you guys estimate this has? What do I need to do motor mount wise to get this in? Sorry about all the questions but I am just not a motor guy, I like body work. :)

That's so beautiful!  <sniff sniff> ;)

Ok, for the pulleys you might find some right here off a 403. Same goes for the motor mounts you need (engine side - frame side are the same as the 400). Things like the water pump, freeze plugs, bearings, rings, gasket set, oil pump and so on you can get from your local parts house like NAPA. Hold off on the bearings and rings until you have a good machine shop check the crank and cylinders to make sure you get the size you need in case any cylinder boring/over-honing and crank grinding is needed. The machine shop may even be able to get you those parts themselves and install ones like the freeze plugs and cam bearings (wich are installed with a special tool).  For the distributor, you might find a good used HEI (which it looks like it has). Again, one from a 403 will work.

Other parts like the cam set (You'll need new lifters and probably springs with a new cam and if you go much beyond stock you should/may need to change over to adjustable rockers and new push rods) you can get from www.SummitRacing.com . They have good prices and last I knew charged a $10 handling fee, but no shipping. Headers are tough on an Olds 455 in our cars due to space restrictions, but ones from a mid '70s Cutlass with the 455 will fit (with maybe some "tweaking"). I suggest you lose the 80lb intake manifold and get an aluminum one. It won't work as is with the shaker anyway, so a drop base air cleaner like Larry Navarro's WFO unit will be needed (or some creative brackets like Rich has).

Let's ee, how many horses would that engine have stock? Probably not as much as you might think. They were starting to go with the more "air friendly" emmisions heads and lower compression pistons by '74. But they never had less than 275. But their best feature was their "frame-twisting" torque. I suggest some good frame connectors. ;)

Let me know what other questions you have! 8)


God I love those engines. ;D
Larry


Offline Rick

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Re: 1974 455 olds overhaul
« Reply #2 on: July 11, 2008, 10:09:08 AM »
God I love those engines. ;D

Do I need to post the picture AGAIN? ??? ??? :D

Offline Joker (告r茺agon)

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Re: 1974 455 olds overhaul
« Reply #3 on: July 11, 2008, 10:14:19 AM »
God I love those engines. ;D

Do I need to post the picture AGAIN? ??? ??? :D

I haven't posted the one with the engine. (family forum and all ::) )


BTW, I forgot to add (and you may already know) that you'll need the brackets in addition to the pulleys. Again, the alt. and p/s brackets will work from a 403 (or any other Olds motor).
Larry


Offline Klatt87

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Re: 1974 455 olds overhaul
« Reply #4 on: July 11, 2008, 10:54:36 AM »
Wow that is  list of stuff I need. I don't think we were doing any re machining or anything, just a freshen up with a new cam. Yea I should probably go with a new intake, any ideas?
If I want to get this done I better get over to the wanted section for some 403 parts!

Offline Joker (告r茺agon)

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Re: 1974 455 olds overhaul
« Reply #5 on: July 11, 2008, 11:35:41 AM »
Wow that is  list of stuff I need. I don't think we were doing any re machining or anything, just a freshen up with a new cam. Yea I should probably go with a new intake, any ideas?
If I want to get this done I better get over to the wanted section for some 403 parts!

Oh ok. I don't like to do that myself. (Been burned too many times.)

For an intake on a mostly stock engine I'd go with a Performer. Others use the Torker, but they are better for higher RPM range engines. The Performer is good from idle up to 5500 which is about all a 455 likes anyway.
Larry