Brodewok

Hello. Thanks for your time. I am swapping a 307 out of a 1982 olds ninety eight for a 307 HO from a 1984 442 Cutlass. I am keeping the CCC and the required emissions controls. I just looked into the part number on the computer. It appears to be a different part number for the 1984 engine/vehicle. Does anyone have any input as to what I might need to do here? Install the computer from the 1984? I'm unsure if the 84 had the 200 or 700r4 tranny. If it has the 700 maybe the different computer has something to do with that? I also noticed that the computer for the 1984 HO and non-HO 307s are the same. Should I be able to get away with my stock 1982 ninety eight computer? Thanks in advance for your time. And yes. I realize there's other engines with more power.

olds 307 and 403

The tune on the 84, it would be a Hurst/Olds might be a bit better. There is probably pin differences between the full size B and a G body, you would have to figure it out. Are you using the 84 H/O carb? If not, you need to modify the secondaries for full opening and change the secondary rods on your current carb. Yes, the H/O had a 2004R that shifted just under 5000 rpm, around 4800 rpm 1/2 shift. What rpm does your car shift at? I have seen as low as 3000 rpm, no good. Another key feature is the 2400 rpm rated D5 high stall, supposedly stalled just over 2000 rpm behind the 307 HO. I find D9 in nearly every 2004R I have found, they stall around 1900, probably what you have. A 2000 to 2500 stall lock up, most are, isn't a bad idea. Another thing that should be added is 3.73 gears, all the 307 HO performance cars had them. Also run true dual exhaust. The factory 307 HO exhaust was horrible in the front half, same crappy crossover, single cat then a Y pipe as your car into a Y pipe then dual exhaust. It is no longer made, no loss there unless someone wants to keep it stock. One guy with a 85 442 gained a second in the 1/4 with just 2.25" dual exhaust off factory manifolds. Good luck.

69CSHC

Welcome aboard Brode.

Keep in mind no such thing as a 1984 442, guessing you mean 1984 Hurst Olds. So H/O sorta has a double meaning for Olds in 1983 and 1984 . Both years High Output engines came in Hurst Oldsmobile's.

Less than people think when it comes to Oldsmobile. Code 9 307s are on par HP wise with almost all small-blocks made after 1970.

Great post olds 307 and 403, you covered the subject like a wet blanket.

Brode the true dual exhaust is your best bang for the buck engine wise. It will get your Code 9 up to 200 HP if shes healthy. But you need to get the drive-train up to speed so to speak as has been suggested otherwise you wont really see it. Much of the extra 60 HP will be lost in the ninety eights somewhat sleepy drive-train and 4000 LB curb.

Brodewok

Thanks for the replies everyone.
I got the engine and installed it recently. It turned out to be a 1983. Not 1984 like I posted before. It is the original carb I believe. I haven't checked the carb number but it came on the engine. I got it running and it seems very healthy. I have some shifting complaints and I haven't fully tuned it. It's running on the Ninety Eight vin Y computer. I have a new computer for it and it's the same part number as the ninety eight. I haven't found a prom yet. Hypertech seems like my only option. There's a stage one and two. I don't understand why the hypertech prom isn't specific to the vin 9 tho. It's also running on the single exhaust. I'm going to run duals very soon. When I swapped the engine I replaced the torque converter not realizing there was a different one for the Hurst. So it's the d9 gm15 I believe. I feel really dumb about that because i didn't read this thread until now and I was told on here about the torque converter. Ehhh. I'm not digging for too much power right now anyhow... Any tips on the PROM? Where to find a original? If the hypertech stage one seems to properly account for the cam? Will the vin9 specific prom alter tc lockup?

olds 307 and 403

The D9 stalls around 1900, which isn't horrible. Make sure you set the TV cable, very important. What are your full throttle shift rpms? Some are calibrated at 3000 rpm, way too low. Hopefully your car shifts just over 4000 rpm, which many shift at but my 88 and this current 2004R shift around 3000 rpm, which is too low. PATC sells an affordable 4000 rpm governor if your trans shifts at 3000 rpm.

Brodewok

I don't know the exact shift rpms. I don't have a tach. I'm going to hook one up to see.
​​​​​​Do I need exhaust manifolds from a 70s sbo to run duals exhaust or can they work with the stock maifold that crosses over?..
Ill be searching for the better torque converter. I can't seem to find one that's numbered d5. I see a gm15 version that has a 200rpm higher stall than the basic gm15. I found it from a search for 1987 buick GN on oriellys website....
How much hassle is changing the tranny governor? Isn't it on the outside?

olds 307 and 403

You need to drop the pan and then 4 bolts to remove a cover to access it. Someone put a block off plate on a 260 manifold, basically the same as later 307 manifolds to run dual exhaust on my 70S. So your 307 manifolds will work, they will need custom bent pipes.

Brodewok

When were talking dual exhaust are we talking TRUE dual or with some sort of crossover? Any muffler recommendations? Best size pipe? Can I get away with only running a pipe down the driver's bank, capping the crossover at the passenger manifold and leaving the old pipe? It's already minus the cat. Once that's done should I change the air filter housing to something non stock? I don't have the Hurst dual snorkel one. Maybe make my own with a full snorkel from another housing.

olds 307 and 403

Yes you can use the existing down pipe, it is at least 2.25", which is the minimum size you want for duals. The driver's side is the same between early and late manifolds. Either Summit or Dynomax Superturbo's were a nice quiet muffler from my experience. Something like a Hooker Aerochamber sounds great but are definitely louder, I may need resonators on my 70 with them. I did exactly what you talked about, made two air cleaners into one dual snorkel. My 260 of all things had one large snorkel I added on to my 307 air cleaner. The factory actually did the exact same set up, one big and one small snorkel on certain models. It saved a few hundred dollars and looks stock and no doubt let's more air in.