Looking for help with a Pontiac 350 V8 in my 1971 Pontiac Le Mans 4 door. Long story short, it drives like a boat. I've been working on my 1970 2 door Le Mans with a 350, but it already had stuff done to the rear end gear ratio and so on. It'll burn off the back tires. Problem is I know nothing about gearing ratio's, and tuning in general, I just know the words.My 1971 4 door has 39,000 miles, and is in excellent shape, but since it's a stock 71 it drives like an 80's Buick. I know that I'm already dealing with decompressed 71 350 to begin with, so compared to my 70 model it will still be a bit less aggressive, but right now, it's all grandma car.Any tips would be awesome. Just a point in the right direction.1970 Pontiac Lemans. Will tear it up!1971 Le Mans.
Now thats a pretty cool pair, I like 'em. I'd say jack up the rearend and count how many turns of the driveshaft equals one turn at the tires. If its three or more, you have a decent gear ratio. If less, yeah think about making an improvement there for performance's sake. Other than that, universal tactics apply, such as dual exhaust, four barrel carb, electronic ignition, careful timing and mixture tuning, etc. Add what you don't have yet. Some poly sway bar end link bushings would be a start on the suspension if its all still tight. Those pizza cutter tires aren't helping either ... but we're here to help.
1970 and 1971 Pontiac 50's were nearly identical, it wasn't until later that compression ratios got chopped. What transmissions are in the two cars?
A little help... 'cause we don't all have to learn the hard way!
hiyeah cool car, cool neighborhood.how much money do you have?can you do your own woirk?as idrivejunk mentioned. if you have freeway gears changing them will like;y get you the most bang for the buck. 350's are common but they increase your engine rpm a bit a fwy speed. high stall torque converters will help you roast the tires too.build a nice 400 engine.
UPDATE: Replaced some cracked hoses and did the first basic maintenance and that helped dramatically. It can't burn the back tires like the two door, but has no problem cruising at 70 mph or more.This weeks agenda:1.) After market air cleaner. Those stock ones are a bit restrictive.2.) Tires and rims. 255/60R15 on front and 275/60R15 on back.I'm actually leaning towards what you all suggested, mainly because I would like to keep it a smooth easy ride. My two door is a beast but sacrifices that smooth ride at 70 mph. With a 4 barrel intake and carb I think I would get right where I'm hoping to be. Also, it's all stuff I can do myself. I can install/rebuild carbs, and all the easy stuff, but rebuilding an engine, or rear end is out of my budget or ability.
I bet that thing rides real nice.Comments on the agenda-Just flip the stock air cleaner lid. Or cut the welds with a chisel and remove the snout then jigsaw a hole to match in the other side. Can you tell theres some JYD in me?I've had the tire sizes you listed, on several 68-72 A-bodies. On a 69 GP now. Even if you run stock steel rims (more backspace than any aftermarkets I know of) at stock ride height, you will probably have some possibly significant rub issues at both ends (but it WILL look COOL). If you gotta have some big-n-littles, 235s and 255s is a safe bet. 245s all around is also pretty great. 245s and 255s isn't much contrast but is what I would judge as a safe max on that, especially if you want to tote passengers. Of course every car and dude is different and these are just opinions / friendly guidance.
Been hard at work. Replaced a lot of vacuum line, heavy duty fan clutch, points, checked the timing, rebuilt the carburetor, 18 inch tires and rims, did some brake work, oh, and the mandatory racing stripe....really coming along nicely. Haven't 100% got the temp problem handled. Runs at about 185 around town and idling which is good, but on the highway it runs between 200-210. Really bizarre problem to have. Gonna fine tune the timing to make sure that's not the problem. I'm still running points for now, so it's possible. I got the timing set up earlier, but found and fixed some vaccuum leaks since then so I could have gotten thrown off by those.
helloyour hot prob is commn. most likely your rad is too small.what is your thermostat rating? it should be 180 or 192.