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  #1  
Old Sep 19th, 09, 10:54 AM
pats72 pats72 is offline
 
Join Date: Oct 2002
Posts: 4
Question Need recommendations for BBC 496 combo

I am about to replace my 402 with a 496. The car will weigh in at about 3200lbs and I will be running a TKO600 tranny. Primarily street duty with occasional track runs. Would like peak HP to be in the 5800-6200 range. I would like to get as much HP/TQ in this rpm range, could go a little higher if necessary.
The heads will be #6272292 oval port open chamber iron heads. The heads have been deburred, bronze guides, larger 2.19/1.88 ferrea valves with hardened seats installed.
Any recommendations for:
Cam
intake
Carb
rocker arms
compression ratio

And finally any projected numbers for any suggested combos?

Thanks
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  #2  
Old Sep 19th, 09, 11:14 AM
pats72 pats72 is offline
 
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Default Re: Need recommendations for BBC 496 combo

Forgot to put in the original post. Will also be running 125hp shot of nitrous for the occasional trip to the track.
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  #3  
Old Sep 19th, 09, 11:16 AM
ryfrat ryfrat is offline
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Ray
 
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Default Re: Need recommendations for BBC 496 combo

Quote:
Originally Posted by pats72 View Post
I am about to replace my 402 with a 496. The car will weigh in at about 3200lbs and I will be running a TKO600 tranny. Primarily street duty with occasional track runs. Would like peak HP to be in the 5800-6200 range. I would like to get as much HP/TQ in this rpm range, could go a little higher if necessary.
The heads will be #6272292 oval port open chamber iron heads. The heads have been deburred, bronze guides, larger 2.19/1.88 ferrea valves with hardened seats installed.
Any recommendations for:
Cam
intake
Carb
rocker arms
compression ratio

And finally any projected numbers for any suggested combos?

Thanks
Lots of guys running 496 here,do a search.Here is something for starters.
Edlebrock RPM
prosystems 950HP
comp gold rockers
low to mid 9 on compression
cam,hyd roller?Chris Straub,UDHarold,Mike Lewis
With the right cam around 550 HP at the crank
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  #4  
Old Sep 19th, 09, 11:18 AM
ryfrat ryfrat is offline
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Default Re: Need recommendations for BBC 496 combo

Quote:
Originally Posted by pats72 View Post
Forgot to put in the original post. Will also be running 125hp shot of nitrous for the occasional trip to the track.
Go with a good set of forged pistons(Mike Lewis,Wolfplace).
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  #5  
Old Sep 19th, 09, 11:42 AM
Tom Mobley Tom Mobley is offline
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Default Re: Need recommendations for BBC 496 combo

great spot for a roller cam. even a hydraulic roller with quality lifters at that RPM. 3200 and a stick opens up some options for you. RPM Air Gap, HP950 carb, keep the header tube size reasonable, no more than 2", maybe 1&7/8". Iron heads, don't go over 10:1 so you don't get trapped in some bad gas deal. Forged pistons for the NOS deal. Buy a cam from UD Harold here on this site. His phone # has been posted several times. something around 240@.050, 110 LSA. There'll be lots of options. Any quality roller rockers will work, I'm still partial to the Crane Golds, they're still out there. I'd avoid the various off brand/ ebay miracle deals there.

3200 and a stick, you're in a good spot to build a little more aggressive combo but I'd keep the CR lower to allow more aggressive tuning options and fudge against any further deterioration in the gas quality. You can get a little more power with higher CR, but if you have to back off the timing and fatten up the carb to keep the pinging under control that HP is gone and it costs you money and power every time you drive the car. IMHO, YMMV, others may differ, etc, etc.
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  #6  
Old Sep 19th, 09, 1:41 PM
69-CHVL 69-CHVL is online now
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Vinny Vince
 
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Default Re: Need recommendations for BBC 496 combo

You cant go wrong with the XR286 that I'm running - what a cam, idles pretty smooth at 1000, pulls up top as far as you dare. Should peak around 6100 for you. Carbs - cant go wrong with a 950HP or 1000HP, although they are a little to rich for alot of street time. Have prosystems build one for you.

496+XR286+1000HP carb+stick = a very, very, good time!

EDIT - and stout cam with have some difficulty driving at low rpms in OD...keep this in mind. My XR286 doesnt like being under 2000 in OD. Should have maybe gotten it on a 112 vs the 110.
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  #7  
Old Sep 19th, 09, 2:50 PM
pats72 pats72 is offline
 
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Default Re: Need recommendations for BBC 496 combo

Thanks for all the advice. Seems everyone agrees on the 950HP Carb. Tom thanks for the compression tips, will keep it under 10:1, more like 9.5:1. I will contact UD Harold for a hydralic roller that will meet my requirements. 69-CHVL great tip on the overdrive and cam combo I did not even think about that. I will have to take that into consideration when selecting my final overdrive ratio and when I talk to UD Harold, anyone got is contact info?
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  #8  
Old Sep 19th, 09, 3:15 PM
wildman926 wildman926 is offline
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Default Re: Need recommendations for BBC 496 combo

I have a 10.5 - 1 496 using the Voodoo 60234 (285/293, 255/263@.050, 685 lift), Victor Jr intake, Mighty Demon 850. Remember those cubes swallow up a cam, so what may be on the large side for a 454 will be on the small side for a 496. The longer stroke will dictate this. I am very happy with the setup, as they are all matched and have very good street manners.
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10.5-1 496/AFR 305's/Voodoo 60234 Solid Roller/TH400 4000 Stall/4.11 12 Bolt
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  #9  
Old Sep 19th, 09, 3:59 PM
Tom Mobley Tom Mobley is offline
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Default Re: Need recommendations for BBC 496 combo

Walter, how would your car do at 1600 RPM in high gear with converter locked? you think it would pull it with any issues? That's a lot of cam for an OD deal.

I guess Pat could just drop a gear if it started lugging/bucking/whatever. Sort of kills the whole OD concept though.

I tend to worry about detonation issues in the lugging condition. That's another reason I push lower CRs for these OD deals.
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  #10  
Old Sep 19th, 09, 4:11 PM
69-CHVL 69-CHVL is online now
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Vinny Vince
 
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Default Re: Need recommendations for BBC 496 combo

Walt, what gear and stall are you running?

I was actually thinking that my cam was gonna be a bit too small, and I was REAL tempted to go larger, cause I thought my 509 would swallow cam. I guess it probably does at higher speeds. But good thing I didnt go any larger, in fact, may be a touch to big for my driving style. The real issue is the fuel metering at very low rpms/high loads in OD, the carb just gets a little wacky. I bet fuel injection would help my situation out, but I just cant use OD till I'm really moving good, at least 1800 rpms in OD. That's why I'm looking to change my OD from .64 to .82.

Pat, what TKO - the .64 or .82, and what gear? I'll bet Harold will recommend the Voodoo 241/249 .625, but on a 112. There was a guy here who built a 496, but used the 231/239 .600 Voodoo, made like 575hp and close to 600ft lbs. His heads had some work I believe. I figure you will be at least right there.
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  #11  
Old Sep 19th, 09, 4:12 PM
Tom Mobley Tom Mobley is offline
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Default Re: Need recommendations for BBC 496 combo

Get Harold at 662-562-4933
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  #12  
Old Sep 19th, 09, 6:28 PM
pats72 pats72 is offline
 
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Default Re: Need recommendations for BBC 496 combo

3.55 rear, looking at the .64 OD. Dont think the .82 will give me the reduction I am looking for on the highway. Have also heard people complaining with jumping from 4th to 5th with the .64. Think I will have issues with the 3.55 rear?
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  #13  
Old Sep 19th, 09, 6:44 PM
Tom Mobley Tom Mobley is offline
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Default Re: Need recommendations for BBC 496 combo

with 3.55 and .64 your cruise RPM is going to be very low. I have 3.73 and .67 (200-4R) at 60 I'm at like 17-1800 with converter locked.

3.73 x .67 = 2.50 overall in OD

3.55 x .64 = 2.27

That's pretty stiff to be running any kind of cam at all. Maybe you can run 80 all the time?

the turbo Buicks and Monte SS had 3.42, overall 2.29.
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  #14  
Old Sep 19th, 09, 6:49 PM
69-CHVL 69-CHVL is online now
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Vinny Vince
 
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Default Re: Need recommendations for BBC 496 combo

Quote:
Originally Posted by pats72 View Post
3.55 rear, looking at the .64 OD. Dont think the .82 will give me the reduction I am looking for on the highway. Have also heard people complaining with jumping from 4th to 5th with the .64. Think I will have issues with the 3.55 rear?

Unless your truely going to be on the highway, I suggest the .82. The .64 will be useless unless your flying.

the 3.55 x .82 still gives you a 2.91 equiv rear gear....how much more OD do you need
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  #15  
Old Sep 20th, 09, 8:36 AM
71454Chevelle 71454Chevelle is offline
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Default Re: Need recommendations for BBC 496 combo

If you are wanting a cam with peak horsepower around 6000 rpms, thats going to be a decent size cam, probably mid-240's or close to 250* @ .050". Not going to run good with the rpms at 1800-1900 on the interstate. With the 3.55's and a .64 OD, 70 mph will get you 1900 rpms. I don't think a cam that size will run properly down there. As Vince has stated in the past, it will make your OD unuseable for anything under 70 or 80 mph.

You are going to have to gear it up 4.10's +, get a .82 OD or drop the cam size (& peak HP rpms) way back.
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1971 Chevelle
496
CFM Ported Stage 5 Brodix Race-Rites 310cc
10.5 scr
Ultradyne Solid Roller 256/264 .660/.660 108 lsa
CFM Ported Victor Jr / Pro Systems HP1000
T-56 Magnum 6 Speed, DFX
12 Bolt TrueTrac, 4.56 gear 33 spline Mosier axles
30x12.5 ET Street Radial
525++ rwhp
http://www.chevelles.com/showroom/da...0930-00149.jpg
http://www.chevelles.com/showroom/da...m/Vic_Jr_1.JPG
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