[88rx7drifter]

hi im new to the forum i bought a 77 302 with roller rockers 750 double pumper carb,and an edelbrock intake. I'm wondering about how much hp does this have. I'm looking to make 250-300 at most, if so what mods would bring me around there. It has been rebuilt i have a receit from a local machine shop reman crank new bearings,stock everything.
Ive searched other sites no seems to want to answer, because its for my rx7 the stock rotary engine has 205 hp and zero torque. and upgrades cost a furtune and are a night mare. but that engines blown now.

[69fastback]

First off that's WAYYYY too much carb if those are the only mods. You can make 300 bhp with a somewhat mild cam, heads, and the intake you have.

[chevy_killer]

ok can you even fit a 302 in a rx7.....second the man above is right that is a little much carb for a little 302......you would be happy with a 600 cfm.....and you are looking at about 250-275 hp

[chevy_killer]

you can get a 302 to smoke a lot of cars out there...(believe me ive done it) you could start with heads and so on...it just depends on how much hp you want.....if you want to get some parts go to jegs.com they have really good stuff there.....if they dont have your app then go to the manufacture site

[69fastback]

You can buy a set of Edelbrock heads for $1000, and throw in a small cam, and get your 300 hp you want. Theres no need to go out and drop big bucks on AFRs unless you're wanting more.

[Horseshoeing]

I got a 750 carb on my 289. It works pretty good, but it is to big. I had it laying around and my 600 was junk, so I put it on. I got a other 600 that I need to rebuild and put it on. Its on my to do list.

You have to size you carb. If you get one to big, you get less suck into your motor. There are set ups that a 302 and a 750 would work, but most would not.

I would bet that your heads have some type of work done on them. Your heads is where you get most of you hp. If you looking for 300hp, I say you should be close. We don't really know what you set up is, but I whould bet it around 300 hp.

[03svtsnakevert]

the other problem you are going to have is if it is a 1977 engine, then the compression ratio is going to be low, low and you might consider raising that with some pistons and heads...it won't do you any good to try to cam it with intake and heads if you are 8.0:1 CR

[88rx7drifter]

the guy i bought it off had the roller rocker heads put on and it has stock pistons im not sure if the heads will drop the compression but your saying the carb is pretty much overkill what would be a good carb for thus setup saying it has stock compression and saying this probably is my goal of like 250-300 range because it is going into and rx7. And the answer is 302s do fit they have kits for that. Now all i need is a tranny. Thanks for the help so far all the other forums just blew me off. what are some differences in the 302 tranny's threw the years i know im going to be needing one out of a mustang. its not a daily driver mainly for drift/drag are 4 speeds good or should i stick with a 5

[69fastback]

If it has true roller rockers, it may have aftermarket heads because if they were stock it would have pedestal mounted rockers instead of stud mounted.

[Horseshoeing]

I don't think I would worry about horsepower from your motor if all your looking for is 250-300. Put it in your car and see how you like it.

I like the T-5 transmission. Not sure how it would hook up with your kit.

We whould look to see pics and updates on your ride. I think that you will have a nice car if you do it right.

[88rx7drifter]

the only items i need left are a fox body double sump oil pan and oil pickup will this fit this engine. accesory pullys and belts. and a t5 tranny isnt there 2 diff bell housing for a 302 i have to worry about when finding a tranny.

[Grimmy]

Originally Posted by 88rx7drifter its not a daily driver mainly for drift/drag

Have you drifted before?

I'm a member of a 240sx forum and this kind of thing comes up every day. Some kid will realize there is more to do than just a sr20det swap. Suddenly he wants to know how to swap an rb26dett into his s13 so he can go drift. The answer is always the same, don't. The reason for this is you dont need lots of power to drift. In fact when you are just starting it's best that you don't have all that power. When these guys learn to drift with their stock ka24de engines they learn how to get the car to do what they want with more finesse. Anyone can slap a powerful engine into a light car and make it go sideways, but chances are that person won't be able to controll it.
The other reason is the balance of weight. The rb26 is heavier than the ka24. Now you have all this extra weight in the nose. As a drifting vehicle this is not good. The same thing is going to happen when you drop the 302 in your rx7. You would probably be better off with an LS1.

[Horseshoeing]

They got swap kits for that too.

[Grimmy]

sure do, some of the guys at the 240 forum have done it for the power and weight savings. the ls1 350 v8 weighs less than th 240cc 4 banger ka24de that came stock in the car.

[Horseshoeing]

I was talking about the T-5 to a old 302, but the LS1 would be nice.

[88rx7drifter]

yes ive drifted before i have a 240 with a ka its good to drift in the rain not enough power to keep the tires roasting in second unless your going down or up a hill and yank the e brake and slide the clutch out.i have a 10th anniversary rx7 with heavy understeer, now this is why i need more power 160 horse power in the 240 is not enough it has a welded rear its slides good but dies out after a while.the rx7 slides nice but i dont wanna ruin it it is a 10th anny.but my other rx7 doesnt have and engine witch puts it up as a good project car for drift/drag lightweight and the 302 is only 100lbs heavier route the battery in the spare tire carrier your got 60lbs diff.And givin all the power/torque an american engine makes it will keep the puny 205/55/16s roating all day. which is why i chose this route to keep me away from another rotary 205hp give or take 0 torque