mtw002 11 Report post Posted March 30, 2011 I've been searching everywhere trying to find longtubes or shortys that will fit in our cars. Can anyone spread some light on what long tubes i can run with a AOD trans in a 69 302 coupe? Quote Share this post Link to post Share on other sites
bigperm2 10 Report post Posted March 30, 2011 You will have to do a search. I believe there is a good post on the VMF with a list of prooven headers that will work with the GT40P's. I am running GT40Ps on my 351 and 4R70w trans, and I am using stock 351W manifolds, I wrote a post about it over a year ago on this forum. I personally didn't want to mess with the steering linkage and have low slung long tubes, and I don't think the power I will be making will be choked to badly by the manifolds. Some of the headers on the list were a little pricy too, but as many would argue, you get what you pay for. It has been reported that HP289 manifolds will work also, and I suspect they would clear (and flow) better than the 351W manifolds, and are available new and are quite affordable. Quote Share this post Link to post Share on other sites
MikeStang 247 Report post Posted March 31, 2011 Hey perm what kinda hp you figure your making? Did you freshen tat 4r70 up or run it stock? Mike Quote Share this post Link to post Share on other sites
mtw002 11 Report post Posted March 31, 2011 Not exactly what i was wanting to hear but thank you... I found a website FPA that sells some tri y's for the gt40 p heads just now. However havent found out how much they are. Quote Share this post Link to post Share on other sites
bigperm2 10 Report post Posted March 31, 2011 Mike, Unfortunatley, progress is slow, and I still haven't driven the car. I am guessing I am around 250-275 hp. I dont have tons of compression, or a big cam. from what I read, a little over 300hp is about the max these heads will support in stock form. As a method of comparison, the first gen lightning made 240. I did the j-mod to the transmission, and will up the line pressure a bit with the baumann controller. Again, haven't driven it to say it was worth it, but the j-mod was really easy and cheap. I have GT40p heads with headers and a good roller cam in my 1966 f100, run by a stock 5.0 computer and a 5 speed. It is a fun truck. I would guess I am closer to 300 on that, and it can get up to 18 mpg. If this 351 gives me any problems, I will probably build the same thing for my mustang, but sticking with stock manifolds. Quote Share this post Link to post Share on other sites
stangs-R-me 120 Report post Posted March 31, 2011 Thought I read somewhere that the AOD was based on the FMX trans. As FMX's were used in some '69-70 Mustangs/Cougars I'd think there would be existing fitment applications out there. Doug Quote Share this post Link to post Share on other sites