subframe connectors and stock class Q
 

as some of you know, i'm looking at building a 67 american for stock and as there isn't any (to my knowlege) "bolt in" connectors made.
are weld in's acceptable?
what's legal, what ain't?

Re: subframe connectors and stock class Q
 

In my opinion, the most structurally sound way to install frame connectors is to connect the front and rear subframes with the connectors welded INTO the floor where clearances above and below allow. It basically requires a snug channel where the 2x2 or 2x3 tubing would pass through the floor and would be welded along the length. Some higher floor sections may not need a floor cut. Then an 8 pt. roll bar would include 2 legs from the sides of the main hoop, behind the seats, being welded into the top of those connectors. "Triangulation" is the key to a stiff frame/chassis.

But a simpler way would be to fit a 2x2 below the floor or pushed slightly up into it and welded at all contact points, including the roll bar legs. I believe .083" is a popular thickness but have heard as thin as .065" being used.

Re: subframe connectors and stock class Q
 

Both our Camaro and Nova had weld in frame connectors, never had any questions about them from any tech guys, Henry. (old 1608 from the 80-90's)

Re: subframe connectors and stock class Q
 

Looking at both "2008" rulebooks, I don't have newer ones yet. NHRA calls for a maximum of 2 x 3 x .125. IHRA calls for a maximum 2 x 3 x .120 mild steel. I'll leave it to others more experienced than I to advise you on the minimal allowances.

I agree with the triangulation. My 66 Chevy II bracket car doesn't have this. I intend to rectify that before we return it to the track. Our crate motor Firebird will have alot more thought put into the chassis before we begin construction.

Good luck with your build,

Robert Swartz

Re: subframe connectors and stock class Q
 

Welded is acceptable. You can also use round tube and chromoly is acceptable also.

Re: subframe connectors and stock class Q
 

thanks guys, i wasn't sure if it was legal to run them thru the floor if nessassary
(obviously welded in)...
i've been told that in late 68 americans and all 69's that amc added them in oem.
i know my 69 has 'em but the 67 don't...


2X3 X .125" ok? (nhra book says so) or would you suggest a thinner wall tube?

Re: subframe connectors and stock class Q
 

Sub frame connectors are only legal when used with a roll bar or cage.

Re: subframe connectors and stock class Q
 

i'm ok with that...as i'm figuring on a cage.
need the weight;)

Re: subframe connectors and stock class Q
 

Again, just my opinion, but 2x3 and .125" seems like overkill on strength and weight, not to mention possible clearance issues above and below the floor. Having it welded into/through the floor with the inner roll bar legs should make 2"x2"x.083" plenty strong. Then you can add any extra weight where you want to and where it will do the most good.

Re: subframe connectors and stock class Q
 

??? That's news to me.

Re: subframe connectors and stock class Q
 

2X3X.083 " will be adaquate. ....The 01 body makes it easy since it's nearly a straight run to the rear rails. ....Only a short area of the floor needs to be sliced. ...You must weld the floor to the rail.......You can parallel the rear rail and just put an access hole thru it for the spring bolt. Tom

Re: subframe connectors and stock class Q
 

Originally Posted by Dwight Southerland
Sub frame connectors are only legal when used with a roll bar or cage.

Thank you Mark.

I went back to the rulebook and couldn't find this. N/S and above are not required to have a bar or cage. With this implication, you couldn't tie the subframes of an N and up car. Does your V/SA Mustang have the frames tied? From the pictures, you don't have a bar in it.

Robert Swartz

Re: subframe connectors and stock class Q
 

Yes, and so did the N/SA Omega before it. Teched in by Travis at Indy in '04

Re: subframe connectors and stock class Q
 

Dwight, I can't find any place in the 2008 or 2009 rule book that says you can't have frame connectors without having a rollbar. Billy

Re: subframe connectors and stock class Q
 

Tom, I'd bet there are less than 5 people on here that know what an 01 body is..... LOL.

Is that 67 a 232 2V ?

AMXRON

Re: subframe connectors and stock class Q
 

yep, with a 3 speed.

what's an 01 body?seriously..
this is a 440 2dr ht (not a rogue)

Re: subframe connectors and stock class Q
 

You might want to re-think that idea.

Re: subframe connectors and stock class Q
 

whyzat?

Re: subframe connectors and stock class Q
 

Can you tell me anything good about that combination? I'm not seeing it.

Re: subframe connectors and stock class Q
 

it'll give some seat time until i can get a 290/4speed combo put together?
and it's already in the car...;)

Re: subframe connectors and stock class Q
 

The 290 doesn't look too bad at 210hp. I wasn't sure about the 4 speed. You can run it it L, seeing you already have a bar (cage?).

I really don't see the 6 cylinder running the index in Q/Stock.
How about it, Tom Goldman?

Re: subframe connectors and stock class Q
 

I was wrong, you are correct. Brain bloat or something.

Re: subframe connectors and stock class Q
 

thought the 2bbl 290s were 200 horse and the 4bbl's were 225....
i could be wrong.

Re: subframe connectors and stock class Q
 

NHRA took 15HP off the combo.Trust me,you would not be happy with the 232 3 speed drivetrain.
Dwight,CRS is a bitch isn't it?

Ed

Re: subframe connectors and stock class Q
 

Mark, I'd be very impressed if it ran under the index in Q ....Even at 2800#. ..... This combo is lower in compression and cam lift than a 258 like Ed F's combo that runs in T., altho the ports are much larger on the earlier heads .....On the plus side ,I guess you could run a 4 speed T-10 in it and not use 4th gear, that would at least give some strength not found in the 3 speed. ....The 290 combo is the sweet one ,only 2900# in K,3005 in L, only as a 4 speed with the 4 barrel in '67 ..Billy Nees has been pestering me to build one of them for years. If Billy likes it ,is got to be good!
.....Tom

Re: subframe connectors and stock class Q
 

I think so too... What is the carb rated at? Bigger cam and carb than a 283 and 10 less horse ...hmmm
Not exactly a 10 cent car ..as Billy would say..

Re: subframe connectors and stock class Q
 

yep, you're right on both counts, i didn't read ALL the page and i prolly wouldn't like the 6 in it BUT, as i said, it might be fun until i get a 290 built.... and i'm leaning towards the 4bbl version and it HAS to be a 4 speed....

Re: subframe connectors and stock class Q
 

Under FRAME it allows joining of factory front / rear subframes in Stock. No mention of roll-bar.

It is interesting that AMC provided subframe connectors on the '68-'69 Rambler. I've been told it was for the V-8 only.
From what I've seen, a 343 Typhoon V-8 Rogue with a factory T-10 4-speed and 3.54 rear gears (or steeper) could hold it's own in a street race back in the day! I would guess headers, a Holley 750 w/ an aluminum intake and 4.10 gears with 7" slicks could add up to a high 13 second street car.
I once had a '69 AMX that had a bone stock 343 with a 4-speed,
3.54's and street tires. It was good for 96 MPH in the 1/4.

Re: subframe connectors and stock class Q
 

i've got a 69 2dr sedan that's got 'em.
it was a 6 cyl/auto car....

Re: subframe connectors and stock class Q
 

I'd go with the 290, 4bbl combo. Don't forget to check the supersession listing on heads and block before you build the engine.