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455 CID LSX shortblock???

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Old 11-21-2007, 10:10 PM
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lots of cars came with the PMD caps. tempests in the 60's, late 70's firebirds, and some wack cars that Pontiac Motor Division came up with.
Old 11-22-2007, 01:57 AM
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Originally Posted by RAMPANT
Why do you think some one came up with a 427 LSx or the 454 LSx, I bet other displacement would have been easier. Some of us are old enough to rememebr the old cars and some even owned them. You are right I am spending a little extra to have a 455, but if you are already shelling out your hard earned money why not get what you really want, instead of settling for almost. Besides I wanted an aluminum block since the LSx is stupid heavy and not going to be seen in any autocross car.

Actually for me no whips antennae, or hood birds, just these center caps.


They look a lot like these.


Do you know what cars came with those or what it stands for? If you are over 35, you might.

Some of us like the nostalgia in the cars which includes the displacement. Have a good look at the next Camaro, Challenger or current Mustang, you might notice they have a lot of traits from the old cars. It does matter to some of us and Detroit has noticed too.
I can see where people may like the nostalgia of the number. But it's not the same. I don't know, I guess I look at things differently, which is the wonderment of automotive hobbiests -- we can all have different tastes. I've just never paid that much attention to final ci. I've just looked at GM engines as big block, small block and Gen III. CI has always mattered less to me than HP. Except in the freakish circumstances where people have built incredible 283s and 327s for monster power.

If the nostalgia is your thing, that's cool. In the end, the only person who needs to be happy with the money you spend is you.

BTW, yes I know what PMD is. No, I'm not old enough to have lived through the muscle car craze, but I certainly know what I missed out on.
Old 11-22-2007, 09:06 AM
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Originally Posted by toneloc60
I've just never paid that much attention to final ci. I've just looked at GM engines as big block, small block and Gen III. CI has always mattered less to me than HP. Except in the freakish circumstances where people have built incredible 283s and 327s for monster power.

If the nostalgia is your thing, that's cool. In the end, the only person who needs to be happy with the money you spend is you.

BTW, yes I know what PMD is. No, I'm not old enough to have lived through the muscle car craze, but I certainly know what I missed out on.
I agree with you 100%, sometimes we all have different goals and sometimes similar ones.

As long as at the end of the day you enjoy your car.

BTW I hope to make a little horse power too!
Old 11-22-2007, 11:11 AM
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Default Real Pontiac Power

Why don't ask us old timers for a 455, you'll get us excited!!!

Jim Butler builds one of the best Pontiac 455 engines.
http://www.jbp-pontiac.com/products/...es/engineS.htm
Old 11-22-2007, 04:06 PM
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If you factor in head gasket thickness, piston valve reliefs, CC of the heads actual measured cubic inch volume in the cylinders is going to be over 455"....so you still didnt *actually* reach your goal technically...

Paying that much extra for a cubic inch? Wow.
Old 11-22-2007, 07:53 PM
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yea! those 283's "powerpack" back in the days. my dad had one those were quick little cars. very good running cars too, left ford in the dust when those came out.
Old 11-22-2007, 10:34 PM
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Originally Posted by LSInnovations
If you factor in head gasket thickness, piston valve reliefs, CC of the heads actual measured cubic inch volume in the cylinders is going to be over 455"....so you still didnt *actually* reach your goal technically...

Paying that much extra for a cubic inch? Wow.
Maybe I am misunderstanding you statement.

I am sure you know what you are talking about, but what does the cc's of the heads, gasket thickness, piston volume have to do with the displacement of a motor? They all relate to compression thats it.

Displacement is really simple (bore/2)^2 x 3.1415(PI) x stroke x # cylinders = CI

The only way to change displacement is to change one of the above, bore or stroke.

BTW bore and stroke need to be measured in inches for the above.

When you talk cc's for the heads that is metric for cubic centimeters. 1000cc's=1 liter
Old 11-22-2007, 11:22 PM
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MTI in houston has been building 455 LS1s for years. way before people started building 454s. they use there own custom bore and stroke. give them a call.
Old 11-23-2007, 12:42 AM
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is it just me, or is nostalgia just for its own sake, kinda gay?
Old 11-23-2007, 07:14 PM
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Is it me or is all the opinions that are needlessly given on the tech sections of this board kinda gay?
Damn I can see if someone asks for an opinion to give one, but when someone wants an answer on a tech question to get ridiculed is retarded to me.
Old 11-23-2007, 09:27 PM
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+1 the guy asked a simple question. he wants a 455. he wants to know who can make it for him. quit the harrassment
Old 12-21-2007, 05:46 PM
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Yes there are people that want a particular number for whatever reason. I have done some 455s and they run great.
Old 12-22-2007, 08:46 PM
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A Pontiac 428 (67-69) was actually a 427. Why didn't Pontiac call it a 428? You guessed it - they wanted their motor to have its own divisional numerical identity. And yet a Pontiac 350 was actually a 354. In 1963, the Pontiac 326 was actually 330.

You can do the same today. Install a LS454 and call it a 455. Say it's Pontiac tradition.
Old 12-22-2007, 09:28 PM
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Originally Posted by RevGTO
A Pontiac 428 (67-69) was actually a 427. Why didn't Pontiac call it a 428? You guessed it - they wanted their motor to have its own divisional numerical identity. And yet a Pontiac 350 was actually a 354. In 1963, the Pontiac 326 was actually 330.

You can do the same today. Install a LS454 and call it a 455. Say it's Pontiac tradition.
If you do the math, most "427's" built with the standard 4.00 LS1 crank and 4.125" bores are technically 428's (427.65 is a 428).

So build a standard 428 and you'll have a Pontiac ci.
Old 12-22-2007, 09:59 PM
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REVGTO, The Pontiac 428 was actuly closer to 426 c.i.d., but no way was Pontiac going to use the same engine size numbers as the hated mopars!!! And Olds and Buick had already used 425.
Now as for using a 455 inch engine, get the real Pontiac 455 and fix that car!
Old 12-22-2007, 10:00 PM
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Originally Posted by sixthfloorfreak
is it just me, or is nostalgia just for its own sake, kinda gay?
how is it gay??.....our cars have a heritage and a history that we can never forget, and its still reflected in our more modern cars........if you think thats gay maybe you got issues of your own to work out

or you can just buy a honda civic
Old 12-23-2007, 12:45 AM
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um, yeah, sixth floor freak... its just you.
Old 12-23-2007, 01:09 AM
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Uh what about a tall deck Warhawk 455 with LS1 24x crank, LS1 cam sensor location (-vs- LS2/LS7 cam sensor location) as well as the ls1 knock sensor locations.

Just a thought...

Then again I wanted a 389 based off of the L92 block, but I couldn't find anyone that made a 3.75" crank for the LS1 based motors....
Old 12-23-2007, 02:48 PM
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Originally Posted by GO FOR IT
REVGTO, The Pontiac 428 was actuly closer to 426 c.i.d., but no way was Pontiac going to use the same engine size numbers as the hated mopars!!! And Olds and Buick had already used 425.
Now as for using a 455 inch engine, get the real Pontiac 455 and fix that car!
4.120 x 4.00 = 426.61 ... but then it's supposed to be a .060 overbore of a 389 which would put it at 4.1225 bore and 427.13. However, NHRA allows 4.125 which is would be the exact bore/stroke of the LS7, 4.125 x 4.00 = 427.65.

The point is, a lot of number fudging went on, so why not fudge your own today?
Old 12-24-2007, 12:47 PM
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Originally Posted by GMmexican
how is it gay??.....our cars have a heritage and a history that we can never forget
It's not gay, but it is a little weird to spend thousands of dollars on an engine just so you can put 455 badges on the car or "impress" everyone by referring to it as a 455. It's along the same lines as referring to a 3rd gen 305 Camaro as a "5.0".

The Pontiac F cars have a longer history with Chevrolet engines in them. The Firebird hasn't used a true Pontiac engine since 1981. So why not honor the heritage of the Chevrolet engine in the Pontiac?


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