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#21
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Regarding the cam, I do plan to run 93/premium regardless of price! Back to your point, I actually have the 218 cam (you indicated 268 which i assume you mean int/exahust at 050 inch lift?). A lot of this is new to me...From the mfg website: COMP Cams High Energy camshafts are designed for street engines with an 8:1 to 9:1 compression ratio...Or this a different issue altogether i am missing. Thanks! |
#22
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268 is the advertised duration at .006” tappet, and the 218 is the duration at .050” tappet lift on the 268 cam. Catelog descriptions in compcam’s listings are often for 350 cid engines. The cam you picked out will act more like 10:1 in your 9:1 455, it will be fine on 93 with fairly cold spark plugs.
Our 76 455 has J heads. If you ground off those A.I.R. boss’s and install 2.07 intake valves they won’t be much different than any of the other common big valve 455 heads. The exhaust ports don’t flow well on a Olds, especially with the A.I.R. boss’s.. The intake ports flow pretty well though, even a J isn’t to bad, will flow a little less. I’ll be interested to see how you get along with that cam, it is going to have a ton of low end tq. |
#23
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Stock camshaft: Exhaust Advertised Duration (Deg): 296 Degree Exhaust Duration At 0.050 Inch Lift (Deg): 208 Degree Intake Advertised Duration (Deg): 274 Degree Intake Duration At 0.050 Inch Lift (Deg): 196 Degree Yes the Olds community all focus on which heads are best; especially now Edelbrock offers new aluminum. Like you said, there is not a whole lot of difference between them all unless you are racing. Any of your Olds in an F-body? |
#24
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My only F body is as 77 Trans Am with a Pontiac engine. I have seen them done though, usually on 403 power f bodies. IRC, you can’t run too tall of a valve cover or the 455 will hit the power boost, stock should clear OK, not a ton of extra room. Same thing goes on the A/C cars on opposite side. If I recall correct, engine mounts should be the same between the 403 and the 455. Water pumps interchange, so you can use which ever length water pump matches the accessories and pulley you find. The pulley’s all inner change. The 455 has a taller block deck, and the brackets that bolt to the heads are unique to 455s. Most of the differences are in the A/C mounts and alternator.
The factory Olds cams were rated at 0 lift duration, it made them look bigger than they actually were. You have probably figured out who is the aftermarket support for Olds engines. Rocket racing and Mondello performance both carry a lot of Olds parts. Last edited by Jay S; 09-27-2022 at 08:24 AM. |
#25
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Hello new to the forums. I have only joined to help another guy out. He reached out to me via my craigslist ad for a 403 and th350 I am selling. Anyhow he had some questions about the 455 swap. I am going to add some pictures here of the 455 I put into an 80 TA.. The biggest thing modified was the set of cheapo ebay headers. Had to add one inch to one of the runners and move one a little back. The modification was only on the passenger side. The header was hitting the lower control arm mount. His specific question was about the Alternator bracket and what I used. I have not put the hood on the car yet. But the alternator is lower than the top radiator hose. I used the 403 Alternator bracket as well as the power steering bracket. Some pictures below. I can attempt to put the hood on the car tomorrow to see if it has fitment issues. I might end up having to change the location to the passenger side like an olds 442.
Also I used the 403 water pump and bought some aftermarket aluminum pullies to get everything to line up. If I can find the items I purchased I will add them to the list of stuff I installed. Last edited by Shoehornguy; 11-20-2022 at 07:47 PM. |
#26
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Man, I think thT alternator is too tall!!!
The alternator bracket looks like it can be modified in a way to allow the alternator to be pushed down some. Not sure it would be enough though......
__________________
1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
#27
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I haven't tried the hood yet but I am starting to think its too high as well. One day when I get another able body I can try the hood on the car. I am also wondering about the upper hose. It sits even higher than the alternator. I will look into seeing what it may need to lower the alternator.
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#28
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The hose looks due for replacement anyway. If you have the same type again to suit the 'vertical' water neck you can take an inch out of the height at the water neck, bringing it down closer to alternator height and sitting behind it.
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The Following 2 Users Say Thank You to Trevor78 For This Useful Post: | ||
#29
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Agree with above. The alternator bracket needs to come from a different car/Olds motor other than a 403 TA. Still unsure of what Power Steering pump bracket to use.
A pic and link below for reference https://www.78ta.com/HTAF/index.php?topic=3288.15. |
#30
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Just the more common Olds brackets then, some may have to come from a big-block Olds or modified for the attachment changes between narrow and wide decks.
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#31
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The biggest problem with the 455 Olds, is that the block is SO f'n tall. Most of the intakes have a horizontal "S" curve to them, and gasoline does NOT like to flow down-up-down. If you run some sort of cowl induction hood, allowing an intake manifold that will flow only downward, THEN you can get a 455 to run decently. Otherwise, a 403 is a better choice IMHO.
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'73 T/A (clone). Low budget stock headed 8.3:1 455, 222/242 116lsa .443/.435 cam. FAST Sportsman EFI, 315rwhp/385rwtq on 87 octane. 13.12 @103.2, 1.91 60'. '67 Firebird [sold], ; 11.27 @ 119.61, 7.167 @ 96.07, with UD 280/280 (108LSA/ 109 ICL)solid cam. [1.537, 7.233 @93.61, 11.46 @ 115.4 w/ old UD 288/296 108 hydraulic cam] Feb '05 HPP, home-ported "16" D-ports, dished pistons (pump gas only), 3.42 gears, 275/60 DR's, 750DP, T2, full exhaust |
#32
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I think I am just going to relocate it to the passenger side. With a CVF bracket., I know I will have to rewire the alternator and what not but. If it fits like shown its below the oil fill tube and should fit under the hood.
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#33
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Been meaning to post updates - NOS cassette stereo installed and engine in!
Surprisingly, the Olds 455 fit really well even with A/C. I had a valve cover leak on the passenger side after the rebuild (bent valve cover) and I was even able to remove the valve cover without needing to unbolt the engine and lift it, etc. I am running stock/'small block' cast iron manifolds right now and will possibly try headers in the future or at least 455 manifolds. Working on A/C compressor now utilizing the brackets of a Cutlass/Delta 88/98... |
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