Enough to run 10’s?
 

Almost done building a full weight 75 TA on drag radials. I’m wondering if I’ll be able to run 10’s on motor? Please tell me what you think. It’s a nice street car, building to hopefully beat some of the late model cars.

400 block
4.35 stroke 472 cu in
10.5:1
Butler 340 cfm heads
242/248 .540/.563 HR cam on 110 lobe sep
1.65 HS rockers should make .576/.600 lift
Port matched Northwind
Fast 2.0 EFI
Tribal Tubes headers

4L80e
PTC 3000-3500 converter

8.5 rear
3.73
30 spline Moser axles
Detroit True Trac
Girdle


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weight?


GTO George

Around 3900 with me in it.


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Yes. You should have the power to dip into the 10s if you hook.
You have talked about your engine but mentioned nothing about the needed mod’s of the fuel system to support the Level of HP, nor have you noted suspension mod’s like the needed frame spanner’s and traction bars , nor the front end mod’s for weight transfer.

Where are you located and what is the elevation of the track you’ll be running at? Near sea level on a cool day if all your supporting systems dialed in it’d be doable. A hot summer day at a higher elevation probably not.
The tri-y headers look cool but if you want to get the most performance out of your set up long tubes with a good 3” exhaust behind them would help.
Let us know how it works out

Looks like a great combination to me! Seems a little light on the camshaft though considering your goals. If you're keeping the duration low because of idle concerns, I'd go 4-6 degrees more duration and widen the LSA to 112

I have a 400LPH in tank pump, haven’t bought lines yet, but think I will run #8 so I have room to grow.

I have UMI springs front/rear, CPP control arms, & Hotchkis Subframe Connectors so far.

Pypes 3” true dual with X pipe header back exhaust with Race Pro mufflers.

Elevation is 242 ft (Memphis Raceway)

Also planned on sending my intake to NX to have a spray bar installed, but I’m going to see if I can fit a 1/2” plate under the drop base & shaker.


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I think it would be close. 11.05 at 123 mph. Car is heavy. What size rear tire?

I thought the same thing when Butler recommended it. He assured me it was the cam I wanted. If I could go bigger (enough to justify the cost) and still pull enough vacuum and be streetable, I’d rather do it now before I stick the motor in.
I figure he spec’d this cam because it’s a street car, with some track days here and there.
I’ve had some 600-800rwhp turbo/blower LS cars, and that’s the kind of cars I’m looking to put a whooping on at the track.


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275/60

I won’t be mad at an 11 flat


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LoL, Ya you will, You'll do everything in your power to see 10.99999 on the board...:) you'll have to get it to hook off the line also.

Haha I know. But for now I’ll be tickled with it on motor.


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If that is a Butler cam he typically uses Comp Xtreme Energy lobes. If they are lobes 3317 & 3318 then your valve lift with a 1.65 ratio would be .594" / .618".

You might consider Comp QXI lobes listed on page 24 here:

https://www.compcams.com/lobe-catalog

They would raise your valve lift to 0.658" which would better take advantage of your cylinders heads. If these are Butler heads I suspect that 340 cfm number is at 0.700" lift.

Yes, it’s the 3317/3318.

I thought the same in terms of being rated at 340cfm @ .700 & asked him why I wouldn’t take advantage of the port volume with more lift. He simply said they’ve done a lot of testing and this was what he recommended.

I agree I could pick up a lot with the one you’re talking about, but would it be streetable?


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I'm not necessarily agreeing with the cam choice offered up by Butler but for conversation compare a XE lobe with a QXI lobe.

Lobe 3317
294
242
164
.3600"

Lobe 13454
295
243
164
.3990"

Other than maybe consideration regarding spring choice is the QXI lobe less streetable compared to the XE lobe ?

"If you want to build a street motor with the most power without a sacrifice of idle and low speed qualities, then lift is the most important factor to maximize, not duration. The best suited cams are those that seek to maximize lift while only adding a minimal amount of duration."
David Vizard


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My 78 with a 0.030 over 455 10.25 320 cfm Eheads Torker 2, UD HFT 239./247 @0.050 Holley 850 2" Hookers through a 3" full exhaust 4.10 gears TH350 29.2 diam 9" radial slick ran 10.90 in perfet air weighing 3750.

based on that combo i think you should do 10's pretty easy.

for comparison i have a 467 stroked 400, 4.25 & .060. 10.7. OF cam, SD ported 71 HO intake & cliff built Q-jet, robbmc 1100 mech pump & 1/2" pickup & lines. th400 with continental 3200 converter & 3.23 8.5 rear. no traction aids & very stiff auto-X type suspension not made for drag racing. & out of the box stock O-port E-heads. 72 firebird at ~3500lbs.

best is 11.2x at 121-123, have to leave off idle & roll into throttle or have serious traction issues with older 255/60 MT drag radials & fighting a fuel starvation issue on any real good runs. im hoping for 10.9 once i figure out the fuel issue & get a new set of tires. even with your car being a little heavier you have a lot more head CFM, cam, intake, gears etc, should do 10s pretty easily.

Might be a tad too much gear. Depending on converter slippage, you could be past your shift points before the finish line.

Maybe see if you can squeeze in slightly taller tires, which will also help with traction.

MY friend Tom Reaves has his full weight 78 TA 3800# although its is 501 ci 455 060x 4.5 with Butler 340 Edelbrocks but its like 13:1 ish ? also big solid roller maybe 280 @ 050 Victor intake 1000 cfm 4150 carb , 3 spd auto 3500 ? It also has a 8.5 3.73 rear and usually only runs 1/8 but ran out 1/4 once was a 10.3 130+ usually runs 6.4 1/8 year around.. this past year his trans crapped 1st gear and its a manual VB he was launching n 2nd gear the rest of season and still ran 6.8's !

Thanks guys. Once it’s together, if I need to go to 3.42’s that’s no big deal, I’m good at building rear ends. I like Steve C’s ideas on the cam, and I’m considering it. Wondering if it will require lifter bore braces, which will be a deal breaker as my long block is together.


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