JamesC

iTrader: (5)

Out of curiosity, is the curb idle speed the same on both vehicles?

JamesC

sofakingdom

iTrader: (1)

AFAIK yes.

DonW

I saw the title to this and about spit my coffee! Retro Race! poor LG4

MY87LT

iTrader: (2)

I know we all want our LG4'S to be L69's and I can say with a little tuning and some headers, it can be possible.

Camaro86IrocZ

iTrader: (1)

L69's are reasonably priced these day's, There's one in my area listed on CR for $200 w/ just over 100k on it.. Bet they'd go much less to move it.. Also see a lot of Complete 305 TPI LB9 take outs, harness and all pop up for around the same price give or take,, Easy to find rollers.. Almost a business.. If i could only sell it all for more than I pay..

dmccain

iTrader: (2)

Thats what i thought back when i had a Lg4 back in HS. Headers, carb, manifold, cam change, 3 in exhaust.. Still barely hit 14s. The 5spd L69 cars and TPI cars destroyed me

86LG4Bird

iTrader: (1)

Yep. Not all that much different. See top part of sig. No headers, no manifold change, no cam change. Just gearing and a very mild TC.

sonjaab

For 86..... Both engine idle speeds should be:
manual 750
auto 550
http://www.iroczone.com/2009/10/1986...pecifications/

JamesC

iTrader: (5)

I did a cam change, intake, complete L69 exhaust (from the manifolds back), and the dual snorkel set-up. Awoke the old LG4, I can assure you. But nothing says fun like a 350 swap .

JamesC

DonW

Yeah, my old LG4 has every bolt on imaginable. Headers, 3" exhaust all the way back with cat delete into flow masters. 65K dizzy, single plane performer, a well tuned Holley carb etc, etc
I can honestly say it woke it up enough to get to the mailbox before my wifes 6cyl Buick. Somehow she still gets the mail before me. Go figure

One of these days I will have this dust collectin 350 dropped in there!

five7kid

iTrader: (14)

There is a little more to it than that, depending upon year and some particulars.

'82-'84 LG4 had dished pistons for lower CR, '85-'86 was same CR as L69. All L69s had knock sensors, only '85-'87 LG4 did.

PROM tuning was slightly different for L69 vs. LG4. Obviously, that fits into the category of "tuning".

Carb tuning was, or could be, slightly different between them - many LG4s had the secondary air valve travel limited (my '86 didn't, however). Secondary rods were different. Again, that's tuning (or in the case of the secondary AV travel, modification - which could be called "tuning").

Cam & exhaust were the major differences. Heads, contrary to popular myth, were exactly the same.

I got my LG4 running pretty well with cam, exhaust, and tuning. But like James said, nothing like the ol' 4" bore mod...

five7kid

iTrader: (14)

I don't believe Edelbrock makes a Performer in a single plane model.

DonW

Well there ya go. DUAL plane.....that two holed job

DonW

Last summer the pinion shaft set screw thing-a-ma-jig broke off in the carrier, and I ruined the carrier trying to drill it out so I went ahead and had it rebuilt with 3.42 gears and all new bearings. It was a 3.08, so you could imagine the stupid grin I got. I wish I would have went with 3.73....hindsight 20/20. All in all everything that was bought for it mod wise was mostly bought by the PO. I dont think I would have dropped a dime in the hacked up LG4 HEI conversion he did, but I did spend a little fixing it to run right. Can't wait for the time to drop in the other mouse motor though!

JamesC

iTrader: (5)

Don't blame you. I made my LG4 an L69 equal (or a bit more), and while I learned a lot and while I was happy with my efforts, there's nothing like the 350. Shoot, I went from 155hp to 200hp or so to 330—now there's a wake up!

BTW, I was always intrigued with 3.73's (even bought the drive and driven gears for the speedo), but I spoke with an L69 owner who complained that he was shifting out of first before he was through the intersection at a stoplight.

JamesC

DonW

I have heard that the 700R4 responds to 3.73 pretty well, but I never thought of actually having to shift through that with a T-5. Kinda reminds me of an old 69 stepside I had with granny low..lol

155hp to 330hp

five7kid

iTrader: (14)

In fairness, the 155 HP rating from the factory is a net flywheel rating, while the 330HP rating is gross flywheel. So the real gain wasn't quite that much.

JamesC

iTrader: (5)

And yet...

JamesC

DonW

Just noticed where you two guys are from. I was all over Colorado last year, mainly Lakewood, right next to Denver. But I was in Littleton too along with several surrounding cities. Man that is some scary driving out there! One of my wheel cylinders on my truck popped a bad leak and I had next to zero brakes coming down 12000 feet of mountain from Winterpark CO In the SNOW!

Had to go right through Lawrence Kansas to get there. One of the nicest mechanic shops there gave me a free spare tire when I just inquired about one. I was making the long trip without a spare and stopped and asked if they by chance had one...and he did lol Nice guy! That however was the opposite of CO. That was the most boring drive from Kansas to CO I could have imagined. Ive never in my life seen such flat landscape!

DonW

James, I bet you get plenty of opportunity to open up all 330HP with the flat straight roads there. Im a little jealous! Five7kid, I dont see how hot-rodders stay alive for very long on your roads..LOL

JamesC

iTrader: (5)

I've been to Winter Park many times—as a matter of fact, we have our family vacation in CO, generally the Frisco/Breckenridge area, every other year.

Boring? Yep. We used to leave for skiing after work so that we wouldn't have to see the flatlands.

JamesC

LG4TA

The compression difference and the larger exhaust manifolds are the game changers. Sooner or later I will rebuild the 305 to better than L-69 specs. Just to keep the 305 matched to the car.