hey guys was just curious to what some of your guys's 396 or 402 bbc combos were, and your HP and torque estimates. Thought maybe this will help me decide on mine. thanks

am i the only one with a 402 ???? :eek:

Originally posted by Anthony:
am i the only one with a 402 ???? :eek: No your not the only one, but you can't expect an answer in less than two hours.

As for mine, its a 396, that the prevous owner said was .030 over. Single plane edlebrock intake, (looks old) 750 vacuum secondary holley, 1 3/4" dynomax headers, 2 1/2" flowmaster exhaust, with 2 chamber mufflers, oval port openchamber heads, 4.10 rear gears, and a BW Super T-10 4 speed.
The car weighs 3650 lbs, 3895 with me, and a nearly full tank of gas in it.

Best run so far is 13.53 @ 106.42 mph.

I feel the car has a lot more pontential, if I could launch harder without excessive wheel spin.

402 60 over (408?), 10.25/1 CR, oval port open chamber heads, UD 272/282 550/570 solid cam, Performer RPM, 650 Double Pumper, MSD 6A (for sale), Hooker 1 7/8 Headers, 3 inch pipes with Flowmasters, 3.73's with a turbo 350.

Don't have any firm torque/horsepower numbers but I can fry my 275/60's going 40mph... :D

I'm building my 462 right now though. graemlins/hurray.gif

Anthony, here's my Street 396 highlights.....

396 (.060 overbore) = 408 c.i.
Closed Oval Port 702 heads w/light pocket work
Standard 2.06/1.72 valves
Edelbrock RPM Intake w/800 CFM Qjet carb
Crane Powermax 278 Hydraulic Cam
9.8 Compression Ratio
Balanced Rotating Assembly

Stock exhaust manifolds w/H pipe - 2 1/2" mandrel bend exhaust system - Flowmaster BigBlock Muffs.

B&M 2400 Stall Converter
3.30 rear posi
TH400 Trans.

This Combo is in the 390 HP/425 TQ range/ and is perfect for street duty and 92 octane pump gas. :D

Charles

Use the search function here in the performance forum..lots of quick 396's/402's running around here..pay attention to the timeslip..not somebody's seat of the pants dyno opinion or guesses..JMHO and not meant to offend anyone..
Do you have an ET goal?

Anthony,
.040 over 402 = 4.165" (410)
Oval port open chamber "truck" heads, #136
2.19/1.72 valves mild bowl work
Performer RPM air gap
4779 holley carb, 750 DP
Comp Street Roller 273/285, 113LSA ,108 ICL
performance listed below is thru a full exhaust
car weighs 3880 with me in it

Here's mine;

402 bored .60
steel crank
10.25:1
049 heads with mild port work
Comp Cams 280 Hyd cam, .520 lift
Performer Manifold
Edelbrock 750 Vac sec
TH-350 w/ shift kit
3:73 rear
270/60-15's
1 7/8 headers, 3"collectors
2 1/2"exhaust into Flowmaster 40 series with full length pipes

Id like to be in the low 13's or high 12's i think im askin alot though, my motor is in the shop right now. heres what the plan is so far

402 bored 20 over
hopin for 10-1 comp
gear drive
Waiting on my machine shop guys cam recomendation. probably run a 100 shot of the juice.
hei, some kind of coil upgrade
MSD 6A
machine shop guy said he has a set of closed chamber heads for me, probably will do some minor head work
probably go with a Edelbrock rpm air gap
750 holley double pumper
probably summit headers, summit mufflers
this is in a 70 chevelle, M=21, lookin for a posi, probably 3.43 gears or something near that. Any recomendations??? cam recs???
thanks for the replys

CHV71402,
What are the specs on the Comp Street 273/285 street roller you are running? Did you go the 11.92 N/A or with N2O? I am putting a street '69 together basically the same package but was figuring I would be in the 12.90 range, I may have grossly underestimated the potential of my "mild" combo.
402 + .030 = 408BBC
290 Oval Ports - stock valves
Reed 280/290 Hyd Roller (.228/.238 @ .050 .578 lift on 112 LSA)
400 Turbo w / 3000 stall
3:73's
1-3/4" headers into 2-1/2" mandrel exhuast, Dynomax Hemi Turbos (stealthlike quiet)
Weiand Excelerator (Port Matched to heads)
770 Holley
HEI.

1971 402 bored .040 over (410 CI)
1971 GM 063 Closed heads 2.19 Intake 1.72 exhaust
Flow #'s @ 600 Intake 298 exhaust 205
Static Compression Ratio 9.48:1
Combustion chamber: 100cc
6223 cross drilled crank
1.72 comp cams rockers
Comp Cams xe284H 110 lsa
matching springs retainers etc.
Eagle I-beam Forged rods
Speed Pro forged 10:1 pistons
Edelbrock RPM airgap
Holley 4160 750cfm carb.
1.75" long tube headers into 2.5" H-pipe exhaust
700-r4 transmission with 2700 stall
12 bolt rearend Auburn posi with 3.73 gears

My 410BBC has 560.42 foot lbs of torque! I am using 063 heads that have been worked on a little (2.19 Intake valves installed, gasket match, 5 angle valve job, little porting)Edelbrock Preformer Air-Gap, CC xe284H cam. Oh Yea, it made 498.6 Hp.

Regards,

396 .060 over, closed chamber oval ports, mild crane cam, performer rpm, 800 double pumper, stock hei, hedman headers, 2 1/2 exhaust w/ hooker aero chambers, m21 4speed, 3.31/powertrax locker, in a 70 chevelle. 13.7 @ 104 on radials (wheelspin).

Box stock '72 402. Adding headers and Flowmaster 2.5" exhaust. Does a 14" air cleaner count?(lol) Its going in a 68 Nova that weighs about 3200lb. Think it can make the 14's? We'll see.

I can't wait to get this one together, its our first big block car. So we are all a little excited. :D

GRN69
I'll take that N20 question as a compliment.
I do not have it on the car.
As for the cam specs.
Comp P/N 11-000-8
Grind # CB 4873B/4875B R113
@ .015 Lift 273/285
@ .050 236/248
Installed at 108 ICL using the
Lift .640/.654
This was a custom grind made at my request using the xtreme solid roller lobes.
We do not live that far from each other ...let me know if you would like to hear it.

Most of it is in the signature below.
email me for more information.

cam is a 280/288 hyrdaulic from Ultradyne.
Heads are Merlin oval port.
CR is around 10.2

TH400 is a manual VB because I'm cool like that.

Just to show you how times and technology have changed. Years back (try late '70's) we had a '67 Chevelle that ran SS/JA (base car 396/325). SS/JA index 11.30. Essentially a warmed over 396/325 with a big solid roller. However, back then we were running 13/31 slicks with 5:13's, open drag headers. You are not far off with the solid roller, but I would assume you must have a loose front end to hook up, even with the drag radials.

GRN69CHV,
Although you never can seem to go fast enough, in my case, with no cage 11.90's is really all I can get away with. As for the suspension setup, I run Hotchkis 1" lowering springs on the front with regular Gabriel gas shocks no sway bar. Rear has SSM bars stock springs/shocks and an airbag. I occasionally drive down to Cecil County on route 10 a loose drag setup would be dangerous. I have tried not to sacrifice street manners too much to gain ET. Your hydraulic roller setup is close to my SR. I am curious to see how your combo performs. BTW I run Dynomax ultraflows with 3" head pipes 2.5 tails, gives a real Jekyl/Hyde personality.

Dave,love that combo!! :cool: graemlins/thumbsup.gif

Thanks for the kind words Chris. Have you completed that gear swap yet? I believe you said 3.31's? Interested to see what kind of change that will make to your combo.

Rad racer,a little advice about the BB in the nova......SUB FRAME CONNECTORS or a full boxed frame.Been there,done that and trust me you will twist that car up if you dont do one of the two.


The best I've seen for a long time is the Nova buildup on HPTV that Chuck and Joe are doing.It looks to still have the potential of twisting alittle bit,but there will always be a little give and take.

I watched a guy in Florida when I lived there 15 yrs ago build a 72 Nova Hatchback as I was in the process of building a 74 SS hatchback and put a 454 in it like I did(mine was a stock 74 454 out of a privately owned from day 1 police caprice). On the second launch with the car he twisted it so bad that the roof buckled ,cracked the windshield,and the doors never did fit right on that car again.Needless to say that the lesson taught to me by that guy frying his car kept me from twisting mine up. It immediately had a roll cage and rear frame fabricated for it.Just thought I would pass that along so you dont build this car in vain.

Dave,

We will have to get together at some point. I am actually just outside of West Chester, Pa.. There are quite a few guys running Chevelles in this area. You may know a friend of mine Steve(I'll hold back his last name), runs a Blue '69 at Cecil and sometimes Maple Grove. Took a 502/502 Crate, changed the cam and is running 10.90's through the exhaust. I am amazed at just how fast cars are today. In reality, we probably over ran everything years ago. The philosphy of building peek torque first, horsepower second has to be the answer.

GRN69CHV
We will have to try and meet at sometime. In the spring time there is small group of us that put together a dyno day in Pottstown. We get a discount with 5 or more cars. Also use the O2 meter. Its a good time. If your car is ready by then it is a good way to see where your at with the basic tuneup. Last year we had 4 chevelle's 1 late model camaro and a turbo buick. If not, the same group of us try to hit TNT days at either Maple Grove or Cecil. Much more fun with a group. Keep us posted on your build.

Hi Dave,
On dyno day, do they let you make some adjustments or is it a one-run deal only? I'd wouldn't mind getting mine dynoed

Hi Vince,
I am usually the one who sets up the day. We go to Performance Specialties in Pottstown. Last year we each made 2 pulls with the O2 hooked up it was 85 bucks. If your combo is off Ray will typically let you make MINOR adjustments between pulls. You can opt to make as many pulls as you like for more $$. We went last year at the Beginning of April. He has a grill outside the door of the shop. Burgers and dogs on the grill, cold beverages, motors screaming on the dyno... can't wait for Spring already. When I set this thing up I will annonce it here, see if we can get a bigger crowd this year. Performance Specialties also has a website, can't remember it right now, do a search check it out. Let me know if your interested.

Originally posted by 69ssragtop:
Rad racer,a little advice about the BB in the nova......SUB FRAME CONNECTORS or a full boxed frame.Been there,done that and trust me you will twist that car up if you dont do one of the two.


The best I've seen for a long time is the Nova buildup on HPTV that Chuck and Joe are doing.It looks to still have the potential of twisting alittle bit,but there will always be a little give and take.

I watched a guy in Florida when I lived there 15 yrs ago build a 72 Nova Hatchback as I was in the process of building a 74 SS hatchback and put a 454 in it like I did(mine was a stock 74 454 out of a privately owned from day 1 police caprice). On the second launch with the car he twisted it so bad that the roof buckled ,cracked the windshield,and the doors never did fit right on that car again.Needless to say that the lesson taught to me by that guy frying his car kept me from twisting mine up. It immediately had a roll cage and rear frame fabricated for it.Just thought I would pass that along so you dont build this car in vain. WHOA :eek: :eek:

He was running slicks wasn't he? I figured that with just street tires(Radial T/A's) I didn't need to worry about twisting it up. Mine won't even have traction bars for awhile. I will be surprised if a stock 72 402 has the torque to twist a Nova up.

Factory BB Novas doin't come from the factory with frame connectors..they are a good idea though..

MY combo: 69 Camaro TH400, 3.90 12 bolt posi

396, .030" over
Speed Pro L2240F30 8.34 to 1 compression at .025" deck height block decked .010"
open chamber heads: one 781 and one 049 head :rolleyes: with 2.19/1.88" GM stainless valves, bowl blended, set up for roller cam
Doug Herbert solid roller camshaft:
296/306 adv duration
240/250 at .050"
112 lobe sep, 108 int centerline
.569/.569" lift
Erson 1.7 Roller rockers
Edelbrock RPM intake
800 Holley double pumper
1 3/4" headers with 2 1/2" Dynomax exhaust
Accel HEI with Supercoil

Haven't completely finished the combo yet, as I am wanting to add a 6-71 blower and a 3000-3500 rpm stall. Naturally aspirated without the blower I am estimating 400-425 hp. With the blower and two 600 cfm carbs with 6psi boost, your guess is as good as mine!! graemlins/beers.gif

mines in my signature, could probably use a bigger carb, ran a 7.23 first and only time down the eighth

scott your engine sounds alot like what mines gonna end up being. whats your 1/8th time, what does would it usually translate to at the 1/4. Estimate on your HP tourqe?