quote Originally posted by theogre: Ok, I never seen that. What a nightmare to have 2 300 series... Only seen 220 Series on some GM "low grade" V8 and a few wanted EFI w/o a lot of work.

It doesn't get a lot of love, most people don't even know about it because it was only really used for... I think like ~4 years? It was first used in the 1981 Corvette, and was last used in the 1984 Corvette (with the newer body style). For the F-body, I think it was only used from 1982-1983... not sure it even made it in the 84 model year.

It really is a pretty cool system, but it was still super-smogged out, so in order to get any real power from it, you needed to hog out the intake ports. GM was forced to intentionally block the ports by almost 30%. They designed them though in a way that any weekend warrior could open them up for full potential. Like... literally, they built up a metal "ramp" at the opening of the port to close it off. So if you just ground 1/4" to 1/2" into the area that was stained by EGR in the intake, it would open it up to the full amount and instant ~20hp.

They offered a 350 version in the Corvette, and a 305 version in the F-body as the LU5.

I think it put out 165hp, and 245lbs of torque in the 305 variety.

With a good cam, no smog stuff, Holley units, you could easily get 250hp with a 305 from it. It really, really woke up on the highway, that's where it was more successful... poor off-the-line power though.

EDIT: Only reason I knew about it is because I had an 82 TransAm... haha...

EDIT 2: Yeah, check this out... I find a picture of one that was hogged out (and cleaned) aftermarket one and an original one with the "ramp" in the intake ports to the cyl head. They block about 2/3rds of it... GM had to do this with the casting last minute in order to make it pass emissions. You remove this, and it immediately gains like 20hp and better fuel economy. Totally ridiculous, but it was the time...

[This message has been edited by 82-T/A [At Work] (edited 04-19-2023).]

quote Originally posted by theogre: 87 & up is another motor and Most parts won't work w/ 86 & down. E-manifold is 1 of very few does work "across the wall" in cave page but OE 87 ones don't have heat stove for Thermac because 700 TBI doesn't need hot air.

Thanks Ogre, that's exactly what I was looking for. The new aftermarket exhuast manifolds that they're selling for the 1987 model, actually have a newer heat shielding on it, which I think will work better. Because it shares the same motor with like the Grand Am and Oldsmobile (whatever it was at the time), I figure they're just making them all look sort of the same. I want to re-use the Thermac (is that a word or an acronym?) on the newer style manifolds, and get rid of the older style one that goes over the cross-over pipe above the catalytic converter.



This car also has the older-style catalytic converter too... which is enormous, so I'm going to replace it with the newer honeycomb style to get rid of the old charcoal style. The piping is decent, but the cat is looking a little ragged, and I'm sure I can pick up a little horsepower and driveability by going with the newer-style cat.

quote Originally posted by sleek fiero: Mr Ogre sorry I sound so negative to you .I must sound like an ass but I just post to help owners with less experience. I know you have been around since 99 doing the same thing and I have found out you have been having some health issues. I hope you are doing better .I have tried numerous times to sign into the Ogre's cave but the page seems unavailable Anyway sorry 82-T/A I didn't mean to cut into your thread.

No problem, I appreciate all the help you've given me, as well as Ogre.

Ogre, do you need help with the website? I'm happy to host it for you for free. How large is it?

[This message has been edited by 82-T/A [At Work] (edited 04-21-2023).]