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Old 09-06-2010, 07:58 PM
83elky's Avatar
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Need some info on newly aquired 468 BBC gurus please apply

Well guys I have recently bought a 468 BBC for my 83 el camino build. originally had a 355 and then to a 388 and now to this new 468. Well I am trying to find as much info about this motor as i can beings I have no information about or from the builder/machinist. and the guy I bought it from had more money than knowledge (nothing wrong with that) but he knows very little about it.







Anyway,It's a 454 60 over, 468

Block - 14015445...454.......78-90... 4 bolt main

Heads - 336781.....73-85...oval...OPEN...454, 118cc chamber, 256/114cc ports




Head gasket is Fel-Pro Part #8523

850 holley DP #4781-6


1.7 crane full roller rockers

Cam is PN# HER CB5S
Cam - RPM Range: 3500-7500 Advertised Duration: 302/312Duration @ .050: 266/276Lift: .600/.620Lash-Lobe Center: .026-110c
http://www.dougherbert.com/solidcamonly-p-9750.html

Lifters are Part # HER T992G

edelbrock rpm airgap knock off (Pro products)

I dont have any #'s for the pistons rods or crank

the pistons are JE/SRP forged- JE wants 75$ and for me to send them a piston to reverse engineer them to tell me witch piston they are.




rods are eagle h-beams
crank is aftermarket




ignition is a msd dist,msd digital 6 and blaster 2 coil

Headers are hooker super comps with 2" primarys with 3-1/2" collectors reduced into 3" flowmaster super 40's turned down at the differential.

electric water pump,fuel pump
manual steering and brakes

only thing run on the motor is an alternator

Im planning on running some nitrious too on some race fuel

prob 150-200 shot at most

I know carb will be too small and when i can afford it i am goiing to go to a pro systems (which ever they recommend)



Ideally I would like for someone to run this on a desktop dyno to see what kind of tourque and horse power im looking at here

or some educated guesses from some BBC gurus

Also I would like to compression ratio


Let me know if theres anymore info you need, I will try my best to get it for you.

Thanks guys!

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Last edited by 83elky; 09-06-2010 at 08:18 PM.
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Old 09-06-2010, 08:48 PM
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Compression ratio will be really low, like 8.2-1-ish because of the flat top piston and large chamber heads. Cam is way too big for so little compression, engine will be a real dog.

JE can't tell you what the piston is just off the forging # in the Underside of the piston because they make several different compression ratio pistons off the same basic raw forging.

I wouldn't worry about a fancy carb, the 850 will work just fine, you will just be spending money in the wrong place. Spend that money on some real pistons or closed chamber heads, or change the cam to something with a lot less duration to go with that super low tow truck compression ratio.

Looks like you have a lot of good parts, but whoever picked the pistons really blew it badly.. Everything in the combo fits except for the compression ratio. I'd guess not much over 475 hp as-is, and a real slug until it is revved up over 4500 rpm. Parts could make 600hp if the compression ratio was corrected.
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Old 09-06-2010, 10:55 PM
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Well, that was something I was a little worried about because the seller (my friend) said that it ran fine on 83 octane and the cam wants 11.1 comp ratio. So there in lies the culprit.

I have little knowledge in the BBC world as most of what I have worked on have been smallblocks. How far could shaving the heads take me? even with a 106 cc head its still not even 9.0:1

I was not expecting to hear of that low of comp ratio! 1000$ set of pistons and there no good for this combo lol I was hoping the short block would be good to go.

If im going to get into this shortblock I am going big compression 12 or 13.1. hopefully I can get this car into the 9's.


Thanks for your detailed reply I really appreciate it!

Last edited by 83elky; 09-06-2010 at 11:03 PM.
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Old 09-06-2010, 11:28 PM
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Ya, I don't believe you could cut the heads far enough to really make a difference, you will need to get down to the 95cc area just to get 10.25-1. Maybe a small chamber bare aluminum head and mill them a little and transfer all the valvetrain parts from what you have would be the most cost effective way to go??

With those pistons it almost sounds like someone was building a blower motor and then couldn't afford the blower.
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Old 09-06-2010, 11:33 PM
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Quote:
Originally Posted by 83elky
1000$ set of pistons and there no good for this combo
The long block is ready for a blower.

I ran a DynoSim on it the way it sits now. Makes 444 hp @5500, 462 ft/lbs @4500. Heads are junk for a naturally-aspirated motor, same flow figures as L31 small block heads 0.100" through 0.500". Raised SCR to 12.0:1 to match the cam on the DynoSim, could only make 531 hp. Sling the heads over the fence.

I can't for the life of me figure out why some mfg doesn't make a BBC head with a decent size intake runner, like maybe 320-340 cc's, but with a small chamber, like maybe 90-95 cc's for flat-top pistons. Every damned head I looked at over the last 30 minutes is 119. Maybe someone does and I just don't know where to look.

Last edited by techinspector1; 09-06-2010 at 11:55 PM.
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Old 09-06-2010, 11:57 PM
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Quote:
Originally Posted by techinspector1
The long block is ready for a blower.

I ran a DynoSim on it the way it sits now. Makes 444 hp @5500, 462 ft/lbs @4500. Heads are junk for a naturally-aspirated motor, same flow figures as L31 small block heads 0.100" through 0.500". Raised SCR to 12.0:1 on the DynoSim, could only make 531 hp. Sling the heads over the fence.

WOW!!! what a turd!! I had originally planned and have been saving for a set of heads but now i have no idea where to go. figure 2000$ or more for a piston swap and another 2500$ for a nice set of heads. how disappointing

Blower thing might not be a bad ide but then the heads are going to choke it too.

Maybe just loosen the stall to 4500-5k and cometic head gaskets/head studs and throw a 300 shot progressive kit on it and let it eat? i dunno lol


Thanks alot guys, this really helps eve though it may not seem that way lol
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Old 09-22-2010, 07:30 PM
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flat top 454 pistons should come with a low compression warning label. many people have confused the compression that a small block flat top piston can achieve, applies to a big block chevy flat top piston. as far as modern heads, (except edelbrock 100cc tbi heads, it's "dome or go home".
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