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#1
07-02-2009, 10:32 AM
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Any disadvantage to 494 ci build?
Hi, I am in the "drawing board" process of my future engine and need advice. I will have it built by a known builder (i.e. Butler,KRE,SD,etc) and see that the offer a 494 size. Is there any disadvantages to that displacement (besides more gas/rubber consumption)?
What I am going for is a street engine 95% of the time that will get a 68 Fbird to high 11's and be able to handle 150hp shot of NOS once in a while. Any help is appreciated since there are some brilliant minds on here. Jason |
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#2
07-02-2009, 11:16 AM
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I don't fall into the
Quote:
Aftermarket or stock block? 400 or 455 block? 494 is not necessary for high 11's. and for 95% street... I would say you'd be better off with one of the 461-468 stroker engines. Of course there's no replacement for displacement... hey, if you wanna build a 494, go for it. I bet it'd be a torque beast.  Good Luck! Matt
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Matt 70 GTO 400 4-speed "Turbos make no noise and leave the line like Baby Diarrhea!" - GTOGeorge |
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#3
07-02-2009, 11:29 AM
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I think they use 400 stock block. Of course I could pay extra for the IAII
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#4
07-02-2009, 11:33 AM
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Sounds awesome to tell someone you have a 494, but don't know if the hp difference is worth the added load on the block and added expense for a street car.
If money isn't the issue and your wanting killer torque. Nice deal. |
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#5
07-02-2009, 01:01 PM
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I'll agree with 'Dude. Not just because he knows his stuff, but because my research has led me to the same conclusion -- its not worth the side stress on the stock block, filled or not to go with the 4.5" stroke. Personally I ended up choosing a smaller CID setup, (462) to keep the bore size as small as possible. You may find some benefits to the undersquare engine, but I wouldnt chance it without the IAII block.
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. Mark S . Who needs nice and pretty, when you can have mean and nasty? KRE Aluminum headed 463CID 73 LeMans. Used to run 10.6x @ 124.55. 3700lbs . So much for 2020...shootin for 9s in 2021...and in 2022 apparently.....looks like 2023 as well. >>My 73 Build thread |
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#6
07-02-2009, 01:21 PM
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We "did" the 497 that's in Jay DeLaigle's F.A.S.T. T/A. It seems to be holding up fairly well, all things considered. It's 13:1, revs over 6,000 and makes a TON of torque (588 RW). It's a '74 455 block w/4X heads.
That being said, I too, recommend the 461 combo. PLENTY of power to go better than high 11s... 400 block is stronger than 455. The Eagle "kit" is the most "sorted" of the many available. Don't be alarmed at any "information" about bad thrust faces, that's ANCIENT history, and not enough of them are around to be concerned. Get a new one, and it's not an issue. Jim |
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#7
07-02-2009, 01:49 PM
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See, I knew you guys could help me. I figured there had to be more stress on the block.
Am I guestamating correctly that I need around 550 hp 580 ft/lbs to get 3800lbs moving that fast. And can this be a pleasant cruiser (I will have overdrive)? |
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#8
07-02-2009, 02:39 PM
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Quote:
When you say get a new one, you are referring to the eagle crankshaft I would guess, but would appreciate you verifying. Thanks! Jim
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"Never try to teach a pig to sing. It's a waste of time and it annoys the pig" |
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#9
07-02-2009, 06:34 PM
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#10
07-02-2009, 07:01 PM
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I like the 474 combo, plus it has a nice ring to it.
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#11
07-02-2009, 07:44 PM
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As a recovering Chevy addict I kind of likelike 496 and 527ci. Or maybe a Pontiac 489? -Jim
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#12
07-02-2009, 08:14 PM
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Jim,
Its peaking now at 6200.. Revs like a small block..The mph is waay up now as well. I am slowly giving it what it wants.
__________________
  Nothing is impossible if you break it down into possibilities. It's all a matter of "Want to". |
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#13
07-03-2009, 09:26 AM
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Jay,
Good to hear! Let's get that ET under 11.50!!! Think it's "in there"? Yes, the Eagle crank is what I'm refering to. There were a few that "got out" in 2002, with a rough finish on the thrust face. Overall, we have zero complaints with Eagle. Jim |
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#14
07-03-2009, 02:57 PM
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I had kind of toyed w/ the idea of a 4.5 stroke crank in a stock block before I got an IAII block...one of the builders I spoke with said that 4.5"stroke cranks were around way before the aftermarket block - and was used w/ success often. Per him minimum "safe" combo was four bolt mains w/ billet caps...
Interesting that two "pontiac" builders on the web sell a shortblock w/ two bolt mains and a 4.5 stroke crank.... |
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#15
07-03-2009, 02:59 PM
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Here you go:
http://cgi.ebay.com/ebaymotors/PONTI...Q5fAccessories May be a great outfit? Anyone w/ experience w/ this builder? |
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#16
07-03-2009, 05:55 PM
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Why try to reinvent the wheel when you can just copy a good wheel ? I run a Mr.P-Bodys 463 in my 69 firebird with p/s p/b tilt am/fm/cd full interior on 87-93 octane way down in the 11s through full exhaust with no problems . It has 13000 miles and hundreds of passes and have no problems except with traction and transmissions . It weighs 3900 race weight on a 9 in slick . Any questions just ask .
Dan
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Get in...sit down...shut up...and HOLD ON!! |
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#17
07-03-2009, 06:01 PM
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Quote:
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Badder than old King Kong And meaner than a junkyard dog -Jim Croce |
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#18
07-03-2009, 06:48 PM
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Quote:
Yes 4.5 cranks were used in stock block in racing. But most were filled blocks with billet caps running 13-1 compression. Lowering compression into the 9.5-1 range and still beefing up the bottom end can be made to run on the street. If i was building it for a customer I would use select 400 blocks with 4 billet caps, bottom filled, lifter brace to help and a 4.160 bore. 489 cu.in. Taking a 455 block out to 500 cu.in with a 4.5 stroke is using max all the way tolerances around. The support issue is the area above the main area under the cylinders (take 2 fingues and feel the thickness, about 1/8') and to the cam bearings. The aftermarket IA block has taken care of this plus better metal used. I would build a 9-1 engine with a 400 block to 4.160 and 4.5 crank. 6.7 rod with bolt upgrade and lightweight piston and pins. Billet 4 bolt caps and live with a measly 489 cu.in.'s LOL. I personally will not build a 2 bolt 4.5" Pontiac combo. Don't need the possible grief when or if it splits. |
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#19
07-03-2009, 07:13 PM
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#20
07-03-2009, 07:15 PM
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