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you don't have to tell me about aerodynamics of a bus. Mine weighs 3450 wit me in it. I just go a little over 140mph. Thats with a 800HP bbc. The engine made 850 on the dyno, but the 800hp is with baby 2" headers and a safe tune up.
The online calcs show your at 500hp at the flywheel at sea level right now. Do you live at a high elevation?

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The calcs can be off.They are for flywheel...not rear wheel. The one I use is dead nuts on my combo. Dosent mean it is on yours however.

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According to you're numbers my truck weighs about 500lbs more which on a rule of thumb = .5tenths and you're motor =120 more hp which should be around 1.2 sec. which would put my truck in the 10.6 give or take. I'm not understanding why this thing is not running like it should. Mabey it's my headers, traction, jetting, i get a little upset wondering if mabey my dyno sheets are b.s. My engine sound great, plugs look good, just don't know.

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were do you find the online calc.?

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Here are a bunch of different Calcs..

http://www.wallaceracing.com/Calculators.htm

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I had one that was balls on for my truck and the track where I race at one time but the web site went down. I also had one back in the Windows 95-98 days that used frontal area, chassis type, DA, etc. But never had my truck at the track then to see how accurate it was.

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I went through the Wallace calculators and If use my estimated rear wheel HP they work out real close to my stats. If I use crank #'s from my dyno sheets they are way out. Now I take dyno numbers with a grain of salt and I've read just as many dyno articles on how the numbers are corrected and worked to read REAL good. I'll look for it and try my best to find one in Car craft or Hot rod can't remember where, but they even admitted to it, and had complaints from people that built those motors and made nowhere near the power they made.

That being said, I dynoed my motor mainly to break it in and to do a bit of timing and carb tuning to get it close before I hit the track. The place that built my motor crushed all my dreams of following a magazine high HP build the first day I spoke to them about building my motor and basically told me if I wanted to see those numbers that another shop would more then likely do it with their dyno but they had a more realistic approch and if I expected those #'s I would be dissapointed with their methods.

I went with their method and saw lower then the magazine builds on the dyno, but it made what was estimated by the builder. And with the parts I put into my motor I don't think that what it makes is BS. As far as online calculators well they are for fun, real numbers are made at the track, and are effected by many things, DA, traction, converter slippage, correct gearing, frontal area, wind direction, the list goes on and on.

TOO many times this discussion comes up with HP numbers and who's motor makes what on the dyno and this magazine made this power with this combo, and one guy spent $8000 less then another guy and makes more power and and he just had to bolt it together and on and on and on never ending like my post. And in the end everyone has their veiws and opinions like holes and strings, aresholes and yo-yos.

And I'll admit when I see a claim of HP from a combo that I know isn't making it I cringe and it's hard to control posting up a call out of BS. And I know of other members that have the same problem cough" JIM "cough. And it's not that I want to burst bubbles and start crap, just trying to keep it real for others that may be spending money and looking for results they aren't going to acheive.

This will be my last opinion, rant or comment on this subject, so I figured I'd make it as long and boring a ramble on as I can, if your annoyed by reading through all this garble well that's how I feel after reading a engine combo that is likely making 100 less Hp then is claimed. I know a guy who's motor made over 1000hp on the dyno with a 250 shot, then ran a 9.66 at the track in a 3500lb. car, hmmm wonder why he now twitches when he says his engine bulders name??? His other set up of alot less power ran 9.97. I'd say start looking at the total power curve and average power and torque, spend alot less time with peek HP numbers, he had a good dyno combo but poor car combo for starters.

Have a good one!:devil:

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Lol....yea I need to start takin my meds. Sometimes I should just bite my tongue. Hi, my name is Jim and I have a probelm. I can't keep my nose out of other peoples engine combo's.
I hear admitting you have a problem is the first step...so...

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Well how about I build it and take it to a dyno and get the real scoop....sounds good to me :)

Lets not forget about it :)

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I am following this build and I already have the shortblock. Lets have a mythbusters OUR way and I will tune it MY way :)

http://www.carcraft.com/techarticles...ild/index.html

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I plan on taking my truck to a chassis dyno and try to tune on it sometime pretty soon. I think some of my problems is my 3800 stall converter and my 373 gears, 1 3/4 headers, and the need for some drag shocks.

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69 Chevy S-wide . Old motor Iron block 638 15.5 to 1 Brodix Big Duke heads , Hogans sheetmetal ram two Gary Williams Dominators 1224 hp @7500 930 tq @ 6100 . TH400 tranny 6500 plus stall , 456 gears . 32inch tire , 3800lbs with me in it . 8.93 @151.00 , 5.71 @123.00 ,10.90 @ 149.00 in Super Street .

New motor Brodix alum block same everything else , runs the same on the throttle stop . Weighs 3700 with me in it now .

We are going to Red River in Shreveport tomorrow (3-15)to see how it runs wide open . I haven't made a wide open pass since Dec 05 . I'm gonna have some fun tomorrow !

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Man that thing hauls da mail. I MPH at 137 in SST trim...and I'm usually in the fastest half of the field. I'm switching to alcohol this year and I've lightened it up some...so maybe 140 in sst trim.

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The alchohol should really help you with the extra tq you will make . Something else for every tenth I kill in the 60 I pick up 1 mph . I have been trying to run 150 or better on the stop for three years now and it has been elusive ....When I built the new motor I had to change cams becuase I went to the 55mm roller bearing deal . Well I went the wrong way on the cam I went with more lobe seperation hoping it would run harder up top but it killed the bottom end too much . This year I got a high dollar 10" converter and hadnt seen alot of change yet (just the trap rpm). I may get it there with this combo but dont know. I know this 10.6 deck block will take a 5 inch crank though . Maybe a 665 will do it .lol......It never ends !

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I think this should make a good combo but I might rethink the heads! I thought about Afr's and talked to some folks that said Afr's bb dyno numbers were inflated. I have too much head for my 468 that's why I want to stuff it with two stages of nitrous. Until I can build a 565! I went the the brodix bb3extra's and I have heard of some really good combos using the round and square port versions of these heads! Just my opinion and you know what those are like!:chevy:

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For my combo.

14 to 1 comp. 468 with Brodix bb3extra square port heads. Edelbrock 2907 intake with an old dominator. Speedtech diffuser plate Spraying 250. I also have a fogger to add. 2 speed glide with ultrabell ultracase and 1.80 straight cuts. 9 inch Neal chance convertor redone by PTC. 9 inch ford rear with 4.30 rear gear and 35 spline gun drilled axles and 33 10.5w slicks. Truck has trailing arms coilovers an antiroll bar and a fatman mustang II front suspension. Truck weighs 3200 with me in it. Times are in my sig. Hopefully soon to lower!

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My junk : 1978 Chevy Luv 2950 # , tagged and inspected . 350 .030 TRW2256 powdered metal , vortec rods , nodular iron factory crank , balanced , fastburn heads , XR282hr , air gap , 650 speed demon , hei msd board , 1 7/8 headers , 2.5 " exhaust 150 shot . Turbo 350 , 3700 stall , 4.10 9" spool , slappers and leaves , 6.97 1/8 10.98 1/4 . I'm now in the computer for lack of saftey equipment ( no bars ) .

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Wow! If you ever brought that thing to my neck of the woods....we could make some money at the track.....that goes for most of the quick guys on this board tho. Do you have any idea how many jackasses there are here that think a truck can't do it?

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How far did you spread the LSA out? Mine is 110 installed at 108. When I freshen(if I'm still running alky) I am going to widen it to atleast 112...maybe 114.
I'm running a 9" spragless converter..I had an ATI 8" but at it's tightest it was going 6800 on the brake. The new one is 6000

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Yea...I hear ya.....I know some guys here running the AFR's and they are really pleased with them.....but they are not running the as cast head either. You are not the first one to tell me that I should go Brodix....in fact, several sources have brought it up.

What is the difference between the BB2X and the BB3extra? Those are the two I hear about the most....just haven't really researched it yet. I guess what I will end up doing is finding the best head I can for what I want to do....my goal is still to have an off the shelf head, unported and pump gas compatible. I don't care if it drinks 5 gallons a mile.....it needs to be barely streetable on pump gas.

Also, an update......the 496 short block should be ready in about a month. It is now being machined, checked and will assemble immediately after. It is using the SRP 212157 dome piston. About 10.6:1 with a 112cc head. Stay tuned...more to come on project 496.

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I like my AFR's 345 CNC chambers as cast port

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The bb2xtra's would probably be better on a 496. I bought way big knowing I would stuff it full of nitrous till I could build a bigger motor!

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I will look a little closer at those heads and may change my mind on the head.

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I went from a 113 center to a 116 center . The first cam was advanced 1 degree and the current one is srtaight up . I set my cams up at .050 lift becuase you dont get an accurate reading on a non symetrical lobe when you use the normal method .

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116...? You running squeeze on that boat? I think my builder went too tight on the LSA. I would love to "just" swap out cams to do a back to back trial, but if it comes apart that far...it's going from a 540 to a 565