Posted this in the BBC forum and got one reply that was not even really a reply and I tend to get better answers here


Keep in mind I did not list the cam because it is matched to the heads and when I have everything ported it will get a new cam. Not that I even know the cam specs. Car was built back in the 80's and people are forgeting whats in it lol.

Car has a 468 BBC on 2 stages of gas on 110 octane, 10.5 ish compression.

TH-400 with a Coan stall can't remember the stall speed.

Out of the box aluminum bowtie heads, out of the box Holley single plane.
Car has a cowl hood but a regular air filter top, not a K&N Exstream.
Electric fans but with a belt driven water pump. Exhaust is a dual exhaust with two 2.5 inch pipes on each side, flows good enough that it ran the same time on the exhaust as it did open headers. Have some quiter mufflers going on that have two 2.5 inch inlets and a single 5 inch outlet, straight threw design. Current mufflers are not really mufflers and the car got a lot of noise pollution tickets lol.

Carb is a worked BG that flows 1,000 CFM, has his initials engraved in it and everything, super nice and high dollar.

Two holley 110 blue fuel pumps one for the bottle.

28 inch tall MT ET Street on a 15X8 wheel, 4.10 or 4.56 gear.

Non Adj tq arm and PHR, SFC's, everything else is stock, he is throwing in some Spohn double adj LCA's with spherical rod ends, LCA brackets and QA1 shocks. Also is hooking me up with a REALLY good suspension tuner to tial it in and make the PHR and TQ arm adjustable then dial it in who is said to be able to get the car on the bumper, may go with coil overs and for sure a rear drag sway bar.

Car went 10.46@136 with a 1.8 60 on the bottle and on M&H racemasters. I will find out Saturday but if he rembers right its a 150 on the first and 200 on the second AT MOST!

How much is this car being choked out? 3800 stall on the bottle seems tight to me?
I know the water pump is hurting me a bit.

There is a local Pro Stock porter that going to go to work on the heads and intake and a local SB2.2/BBC machine shop thats going to spec a new cam out for me. I know the cowl hood will get a lot more air to the engine with the K&N top on the air filter.

What do you guys think it has in it with all the above?

The MPH is in the 9.9's. Keep in mind the car just has a roll bar and will need a 10 point. As it sits now with a cage and hooking I bet it would go 10.0.

Here is the CRAZY part, he said it went LOW 11's on the motor..... 3XX shot only picking up about a second? Can we say choked out?


I have been told by a few people that it will be pretty easy to get it 60ing in the 1.3's.

 

Here is two time slips on the car
60 1.697
330 4.660
660 7.031
MPH 105.12
1000 9.035
1/4 10.723
MPH 133.45

60 2.133
330 5.155
660 7.575
MPH 102.47
1000 9.622
1/4 11.343
MPH 131.00



The 1.6 60 is descent but thats still a lot of MPH for the time lol

 

3800 stall on a 200 shot is ok.
Awesome mph, got 9's on the motor if you can get that 60' down. 1.3's is definately doable. Nice set up.

 

Its spraying in the very low 300 range on both stages right now.

He also has a slip that went 10.4@136

Once its paid off its getting the suspension along with the cage then I will swap the cam with the ported heads and intake. See what the motor will handle on the bottle.

Might have the tranny looked and and have a T-brake put in....

 

I pull 1.4's at a 10.50's at 125 w a 502 and a 175 shot on a foot brake so you should be able to get 1.3's easy

 

I wonder what I could get out of it on a 300 shot on both stages and everything ported out..... on a 1.3 60

 

Something really sounds off to have to spray a 300 hit to run those numbers. Just sounds like the engine doesn't make any power at all on motor to have to spray that much.

I would work on getting the car to hook well consistently before you think about putting more power in it.

What's the engine combination in detail?

I'm not a nitrous guy, but on that much hit, it does sound like a tight converter to me. Of course that could also mean the engine is down on power too. Heck, my N/A 8" converter flashes to 6000 rpm off the footbrake, so in comparison a 3800 sounds like a stock converter. lol.

 

Nobody really knows the details on the internals minus compression because it was built so long ago.

The plan is to take it to the track a few times and work on the 60.

After that I am going to have the motor pulled and looked at and have it all ported and another cam put in. I net it will need a stall change then also.

Waiting to here back from a guy on here that knows a little more about the car.

here is whats funny, they ditched the factory power brakes because the cam was killing the vaccum. The heads and intake are all out of the box. Sounds like a big cam if it did that and with the heads being out of the box..... hmmm but I talked to the builder once and he seems to know his stuff on picking and matching cams and knows not to go to big...

 

Found out the car has NGK plugs in it are -11's!!!!!

BBUUUURRRRR SUPER COLD!

Was told by a respected local BBC N20 racer that he would not be suprised if the car kept fouling plugs left and right and all.

Well when he pulled the autolites that are the same plug pretty much I was there and they might as well be dripping with fuel. He also said the cars take a little bit of cranking to start. Once I talk to NGK I will put in what they say and see if the plugs stop fouling on the motor.

Car only sprays a 300 shot right now. Going to call NGK and see what they say.

Should be ok with -8's maybe. We will see what they say.

 

Here's my general rules of thumb.

low compression street engine, no power adder = -7 plug
high compression race engine, no power adder = -8 plug(what I urn in my N/A 461 bbc with 13.4 to 1 compression)
power adder like your nitrous = -9 or -10 plug. If spraying all the time, most guys I know go for the -10 plug.

 

He told me they had a plug for cruising and a plug for racing.

 

That's a very good idea.

 

Ok, thanks.

What would you say for a 10.5 compression 468 BBC on 110 octane for just cruising around ang getting on it some on the motor only? NGK TR-7?

 

ngk8-9

 

-7 or -8 at the hottest. Why 110 octane on a pump gas compression?

 

It does not get driven a lot nore does it have a stand alone fuel system. Its easier just to keep the good gas in it so if it gets raced you don't have to worry about pump gas being in there also with the N20.