Yep,you are correct on that. The Monte SS', Olds 442's, and Buick GN's had the same 7.5" posi with 3.73 gears I do believe. I haven't checked anything yet, mostly because my Uncle can source a Ford 9" that will work for G-bodies along with my dad. Only thing is, I don't know how much either of them will be. If I do find a 7.5" posi from either of the previously mentioned cars, I will jump on it though. They shouldn't be too much. :bglasses:
The buicks always are better than the other gm cars. The grand nationals and turbo regals(t-types) have 8.5 rears with 342 gears. Some pois some are just open but you can buy a spool for cheap cause it's kinda like a 10 bolt in the older cars. Chevy olds, Pontiac , an "regular" regals have the 7.5 rears. You can still build them up strong or just make sure it's your tires braking loose an not anything else
Sorry for the double post, but I did have a question pertaining to my exhaust system that I don't believe was answered at all yet. I could get a full exhaust system from TA Performance, but as much as I would want too, I was hoping to use the unused G-body specific Y-pipe I got for the car. Plus, I'm trying to be as budget minded as possible. The exhaust system is a 3" single pipe that splits to two 2.5" duals and then into the mufflers. Would this be enough flow (especially with stock manifolds since they're are no shorty headers to speak of) to get to my power output goal? Actually thinking about it now, the manifolds are probably going to be more restrictive than the exhaust system further down stream. Maybe I'm just over thinking things, who knows. Just want clarity on this since I will be getting ready to buy some go fast goodies real soon.:Brow:
If you are really looking to bump the power up spend you money on head porting and oversized valves and when you have the money do a set of headers and dual exhaust. For a mild street car the single 3" will be fine, for racing the headers are better....
Yep, I do plan on having someone port the heads and look into different valves.:TU: My main goal with the car was a street car first and foremost. I think 400 ft/lb's or so would be good for a summer daily driver, and some fun. Was just hoping the exhaust I have would be able to flow enough and wouldn't hamper my projected goal. Later on when I have more money saved up I will most likely change to a true dual exhaust or x-pipe system, and maybe even boost her. That, however, isn't for a long while yet.
other than the headers i think you could have a shop make up an exhaust for a few hundred ---------- Post added at 03:39 PM ---------- Previous post was at 03:37 PM ---------- im just going to port my heads myself by gasket matching. pretty cheap to do.
Ya, I just would hate to let the Y-pipe I have for the car sit since it has never been used yet. Probably will hook it up and see how it goes, and honestly I don't think it will be terrible. Head porting though, I'm not sure I would trust doing myself, nor do I really have the tools for it at the present. I guess I'll never know how everything will go until I actually do it and see.ray: Also, i have the 1969 engine with 10.25:1 compression ratio. Is this compression correct? I've heard some places the compression was actually lower than what it was advertised as.. Any weight to this?
If its a gs motor its that cr a skylark was lower. As for head porting all you need is a dremel some bits for it a sharpie. Lastly your exhaust you could just run a dual out muffler or split it and the end of the y. It would be little to no diffrent than the x and true duals
Hm ok, I ask because it came out of a 1969 LeSabre 400 with the high output 350-4. I was under the impression it also had the 10.25:1 compression ratio. Could be wrong though. Also, the I have a Y-pipe already, it's a 3" that splits off into two 2.5" dual's out the back. I was thinking it would be alright, just wanted to make sure with people who would know better than I. Still a learning game with these engines, but I'll get there I'm sure.uzzled: As for a dremel, I might if I build up enough courage to do it. I just don't want to take off too much with never doing port job before till this point.
If its a '69 hi-comp, its the same engine as a GS 350. If I remember correctly, it would be an RP code. As for head porting, it can be tricky, but as long as you dont get carried away your first time, go for it:TU: Just stick to gasket matching and casting cleanup. Remember, be extra carefull working in the bowls. One slip and you can murder a valve seat:eek2:
I will have to check for the RP code, but I'm 99.9% sure she is the high output 350. :beer We'll see once I open her up if I feel that adventurous and grind away, or not. Just hope I do an alright job if I decide to go at her.ray: That's what I thought. :TU:
Well, I suppose I should update this posting a little with some questions and good news. :TU: Just got a permanent spot at the place I've been working at, and will be getting a raise, which also affects my build plans in a positive way (Always a good thing, or maybe not..). I've been thinking of boosting the power output, and have been flirting with a turbo/supercharged setup.. I know these engines like boost, and I've heard good numbers from even turbos on stock engines. Maybe I'm opening a big can of worms here, but what say you all about boosting these engines? Sean, I believe you have a turbocharged 350 if I'm not mistaken? What would it take for me to boost this engine have good street manors? Not looking for a drag only car, more of a touring type car. Any info from you, or anyone else would be great. Thanks again, all. :beer
You can scroll down to the vendor section,Sean has his own section down there with postings about turbo charging. I think its called the 350 performance book section. Goodluck.
Unfortunately the guy who was building the turbo kits for the Buick 350s had a stroke and closed his shop so there is no longer a kit for this engine. There are still ways to build a setup yourself but it is a lot of work unles you are used to metalwork and have the tools. I am trying to get a Bolt on Supercharger kit available to fill the void, I will keep you posted if I get that done.
Ah, that's too bad.. Always sad to hear a fellow gearhead in rough shape. Hope he is doing ok. If anything pops up with the supercharger route, it would be great if you could keep us all up-to-date on that! I would be really interested in something like this.
