What about running an 727 or a 518 or so with a 650Hp Big Block in Autocross?

Sure it can work.

And read here;

https://board.moparts.org/ubbthreads/ubbt...tml#Post2191799

Thank you and I read that before dam I must be getting old or something. What about a converter I would think that it should be tight as you wouldn't want it to flash coming out of the turn.
Also with a 1.57 second gear installed with a 3.73 gear and 25.5 dig. tire that is 77 MPH at 6k. The perfect setup gets you to 62 - 65 MPH in second. A 1.92 second gets you there like a 18 spline 4 speed. I guess with over 625 HP and 580 TQ. I may not worry about pulling a 1.57 second gear.

Just be sure the torque comes in at a lower rpm, maybe by advancing the cam 3 degrees or so, and you won't have anything to worry about and won't have to buzz the engine.

236, 244 at 50 duration on a 113 center and 114 lode separation and only 533, 540 lift with a 1.6 rocker and 493 stroker it starts low on the TQ.

Oh and it's a Hydraulic roller and will have Fuel injection.

Sounds like it'll do great at low rpm, and will move the car just fine in 2nd at a low rpm. My car does great, almost stopped and in second and it'll move along just about as good as in 1st. But then AMC engines are known for their low rpm torque.

A stock 318 is enough to get the novice driver in over thier heads fairly easy, just sayin, before you quickly discover putting down 650hp with a big block is rather difficult, but driving it like a go kart (left foot braking) is fun.

I have been running a Porsche 911 in super street for years now. I have been looking to upgrade to a 997 GTS or a 997 GT3 but they just let the 991 GT3 in the class. I also looked at a 08 Boxster RS60 Spyder for BS or taking my car to ASP with Hoosiers, but this is my daily driver and that would take mt 911 out of daily use with camber plates high spring rates and -3.5 deg of camber. Plus I need a trailer. This project has been stalled since I started racing the Porsche's. Hell I bought the engine parts in 06 with the Wilwoods so I just want my big block power back. Anyway here in Colorado I will be only at around 550 Hp. The last 10 years is the first time I haven't had a built big block since the late 70's.
Buy the way I'm a SCCA SOLO safety steward so I'm not a novice. I'm just looking to finish a long over do project car and have a blast driver to the limit OK and past the limit and to kill a few more cones. This is what I have been running from a few years ago at a Match Tour.

This is what I'm working on now.

Plus

Looks like a fun car.

Here's my car before and after paint.

I always love the Mark Donahue paint jobs that they had. I lived in Kenosha in 70. My first car was a 71 Javelin that I got from my Dad in 73.

I always love the Mark Donahue paint jobs that they had. I lived in Kenosha in 70 so I saw a lot of those cars. My first car was a 71 Javelin that I got from my Dad in 73. It looks like you were running ESP are you running CAM T or C now? CAM looks like a fun class and the folks are a let us help you get faster.

You will probably want to have a custom converter done with that type of usage in mind. Thats what I did for my car as auto cross is one of the main things I have planned for it plus some trips to the drags. I had mine done by Continental. Gave them the engine dyno sheet, specs, car weight, gearing, tire size, trans specs, useage etc.

I haven't run autocross since about 2001. Been spending all my time Bass fishing.

Yep custom converter I was talking with SMR yesterday on a 727 and converter for what I'm doing. It needs to live with 700 HP encase I change the cam for more power but I'm going to see how this motor does first.I was looking at Passon 5 speed but that is a year out and $5200. I could also go with Passon 4 speed overdrive with a 1.77 second or just buy a 18 spine 4 speed with a 1.92 second. I'm just looking at my options. I will be running 2 set of wheels 1 for racing and 1 for street driving. The race tires will be BFGoodrich Rival S 275 X 35 x 18 Fr and 315 x 30 x 18 rear. That is a 25.5 tall tire and I want to be around 65 mph in second. I'm also shooting for around 3400 to 3500 lbs car but that is a long shot.

I'm not sure I can slow down that much yet.

I've thought about starting up again, but couldn't afford to, then 2 years ago bought a new boat, so still can't afford to. Haven't even driven either car for 2 years.

It will be great to have anther mopar at the races! The Chenowths and I are the lone mopars at nats the last couple years.
Shooting to have my cam-t valiant ready by spring but that is a long shot as i just took on another major project. It will be a 500hpish rb with a 727. I had some of the same concerns with the auto but i think i will be fine. I'm running a 275 35 18 square with a 323 gear. Our average course speed is 40-45mph with peaks of 68-70 mph on the really fast courses. That will stick me in 1st for most of the courses with the occasional blip into 2nd.

Can't wait to get this thing done. My 15 scat pack is fun but just isn't competitive nationally. Hoping the valiant does better. Good luck on your build!

I'm not sure that I could make it to nats next year. I don't think that I will finish till about mid season. Even if I get it finished in time it will take some time for me to dial in a new type of car that I'm use to. And damit I will have to learn how to drive something that doesn't have large weight at the rear that I can use to turn the car.
On the speeds that sounds about correct. I was hitting the limiter in second a few times in the finish lights at about 67-68 with the tires that I ran last year.

My B&M HoleShot has lived and performed flawlessly for over 35+ years of serious SCCA and related autocross competition. Stall is ~2400?

I was thinking something like 2000 - 2500 would be good Thank you for the input. It's just hard for me to give up a stick and that 1.92 second gear but I'm leaning to a 727.

BobJ, With the power you're looking at I think the 727 is going to be easier to set up and drive reliably. If you were looking at something where speed matters (talking competitions where 100+ mph is a major part of the game) then it the manual transmission would be much more important. OTH, if you really prefer the feel of a manual, you got to go with what you'll be comfortable with on course.

I rarely post here, but popping in to say I've got no complaints about AutoX'ing a 727.

My car is stock weight, mild 440, 2400 rpm converter with 2.96 rear end. I just start in second gear and leave it there, the tranny seems happy. I've never noticed any high temps or slippage.

Yup, second gear and go for it. Worked great in my SS/T also.

National Tour, July '98. The truck was 5 1/2 months old with 500 miles on it. I've beaten lots of cars with it in the novice classes and finished the summer in second place behind a '67 or so XKE after racing it for only the last 1/2 of the summer.