83C_CamAroZ28

iTrader: (12)

ok so does anybody kno where i can get the engine specs for L69 305 5.0L H.O?...like complete detailed...and can i build this without the H.O small block?...can i just use any 5.0. small block?...

skirkland1980

iTrader: (2)

if it helps any i have the specs for the heads. casting #14014416 58cc combustion chamber. 1.84/1.50 valves 165/59cc ports

83C_CamAroZ28

iTrader: (12)

ok yea thanks that helps...and is this for 305 H.O L69?...

skirkland1980

iTrader: (2)

yes. you can check the casting #s under the valve covers to make sure it has the correct heads.

83C_CamAroZ28

iTrader: (12)

ok thanks...i need more help guys...

five7kid

iTrader: (14)

LG4's and L69's used the same heads, crank, block, rods and intake, with only slight differences to the carb. '82-'84 LG4 used dished pistons, '85-'86 LG4 and the L69's had the same pistons. Biggest differences were the cam, air cleaner, and exhaust, as well as slightly better PROM tuning for the L69.

83C_CamAroZ28

iTrader: (12)

ok...so i can slap on the LG parts on for the L69?....just change the cam?...do u kno wat cam it takes?...i was told the pistons were different?...is that not true?...

Damon

In 83 the LG4 low output used dished pistons yielding an 8.5:1 compression ratio. All L69s used flattops for a 9.5:1 compression ratio. Cam was different, as stated above, but even the L69 cam was nothing to write home about. An entry level Edlebrock Performer cam or Summit house brand K1102 would perform similarly, if not better. There are cam specs listed in the tech articles of this website if you want specifics on the stock cams.

Intakes and carbs were identical except the L69 used DR secondary rods vs. the LG4's CH rods. Distributor identical, pretty much everything identical. Exhaust was different from the manifolds back, though. 2" outlet manifolds for the LG4, 2-1/4" outlet manifolds for the L69. Y-pipe, cat and everything back was bigger on the L69. L69 also had a dual snorkel air cleaner vs. the single on the LG4. I think the fans were different as well, but I can't recall exactly.

In 83 the L69 had a knock sensor system while the LG4 did not. Also the chip tuning (mainly the saprk advance curve) was more aggressive in the L69.

That's pretty much everything I can think of off the top of my head.

83C_CamAroZ28

iTrader: (12)

ok ok this wat i wana...all of this good stuff is good info for me...all i need is just the 305 small block to start and from there im good and will have me car out on the streets again......

if anybody knows more plz let me kno...

five7kid

iTrader: (14)

'86-'87 LG4 had electric radiator fan, as well as all L69's. '85-'87 LG4's and all L69's had the knock sensor. As stated, some LG4's had different pistons than L69's, but not all.

You can take an '85-up LG4 shortblock and make it every bit the same as an L69. You can take any 305 shortblock, and with flat top pistons, make it the same as an L69.

In California, you'd be best advised to use a block of '83 vintage or later (same year as your chassis or later).

Of course, if you found a 350 shortblock, and didn't say anything to anyone about it. . .

83C_CamAroZ28

iTrader: (12)

ok thanks...when said later...that means i can get a shortblock from a newer model?...

so if picked up a 350 shortblock...wat would i b able 2 do with it?...

five7kid

iTrader: (14)

Yes, you can use a later block, but be careful - you are limited to carb models (if they happen to check casting #'s).

What you can do with a 350: Put your 305 stuff on it. Go faster. (And lay lower at smog time.)

83C_CamAroZ28

iTrader: (12)

ok so wat ur sayin is just get the 350 block and put 305 parts in it?...wouldnt i have 2 put bigger pistons?...i have a 350 now i think...ill get the castin #'s and post them up...how would i kno if its a shortblock or a longblock wats the difference?...

83C_CamAroZ28

iTrader: (12)

ok so does the 305 H.O block say 5.0HO on it?...

Grumbles

when he says put your 305 stuff on it he means your heads on the short block. Naturally it will have bigger pistons as bore size is the difference between a 350 and 305.

five7kid

iTrader: (14)

No.

five7kid

iTrader: (14)

As noted, I said "on it", not "in it".

A shortblock has crank, rods, pistons, sometimes cam/timing set, but never heads. A longblock typically has the above plus cam, lifters, pushrods, heads, valves, rockers arms (and sometimes oil pan, oil pump, and timing cover).

Atilla the Fun

Definitely do the 350. If you're going to put 305 heads on it, you'll need to stick with dished pistons, not flat-tops with valve reliefs. Valve reliefs don't count as a dish, though they do affect compression. Just not enough. Choose your heads and pistons, then we can discuss cams.

83C_CamAroZ28

iTrader: (12)

ok so what would it have?...or what would it say?...

83C_CamAroZ28

iTrader: (12)

ok so just put heads on 305 on the 350?...i thought u meant in it...in that case ill just build a 305 stock to my year...so i would need the specs...:/...

Atilla the Fun

Any 305 block will do.
The original L69 cam specs are 202/207-114.5 at 115 .404/.415. Several companies offer replacements with those specs, including Elgin.

83C_CamAroZ28

iTrader: (12)

ok thanks for the help guys...

83C_CamAroZ28

iTrader: (12)

are the heads the same on LG 4 and L69?...does anyone kno the the castin number on the heads for the L69?...

skirkland1980

iTrader: (2)

reread posts 2 and 6

83C_CamAroZ28

iTrader: (12)

lol......thanks ok can u tall the difference between a LG4 and L69 just by lookin at them?...or no?...

skirkland1980

iTrader: (2)

im guessing but maybe the engine serial number?

83C_CamAroZ28

iTrader: (12)

ok im not sure ether im waitn on a book i ordered its suppost to show me every part the engine came with......anybody kno the difference just by lookin at the LG4 and the L69?...

83C_CamAroZ28

iTrader: (12)

bump...

HankL69

iTrader: (1)

What exactly are you trying to achieve? If you want it to perform like an L69 all the parts are out there to make a 5.0 to L69 specs. If you want it to look like an original HO engine you will need the dual snorkel air cleaner and fresh air plumbing hoses.

HankL69

iTrader: (1)

I forgot to attach the pic.

five7kid

iTrader: (14)

There are no clues on the engine itself (with the possible exception of the VIN stamped on it). What is on the engine, as Hank points out, is somewhat of a hint. But, that doesn't tell you if someone put such an air cleaner on their non-HO car (like I did).

Yes, it would be nice to know why you're asking. As it is, we can keep going back to get another rock for you for a long, long time, but if we knew why you were asking, we could probably get you the rock you're looking for right away.

83C_CamAroZ28

iTrader: (12)

ok yea i want to make it into a 5.0 L69 HO and make it look like it also...

Atilla the Fun

Which brings us back to the fact that you can make a 350 look like the L69, for the same money, so why not?

Street Lethal

iTrader: (16)

I agree with Damon. I just picked up an '84 15th Anniversary L69 Trans Am, and the only external differences that I can see in comparison with the LG4 is the ESC knock sensor, and the Electric Spark Control (LG4's got both in '85). That, and aside from the L69 intake setup, there are really no other external differences in your '83 between the LG4 and L69....

83C_CamAroZ28

iTrader: (12)

ok thanks thats good to kno...ok so i just got my car back on the road this morin and its runnin bumb...lol...to clean......and its a 350 according to the numbers on the block which im guessin it has 305 heads on it...so u guys are convincing me to stay with the 350...im on the boarder-line...

ok so guys i live in cali and we have to smog it every 2 years...so can i change anythin else on the 350 but wont mess with the smogin issue?...

2 make it sound a bit meaner can i just change the cam on it?...

Atilla the Fun

With 305 heads on a 350, I'd suggest a COMP 12-210-2, but you might need a custom chip to go with it. This cam is mild enough to pass emissions up to '86, and has a Calif. E.O. number.

83C_CamAroZ28

iTrader: (12)

ok here's the block number...14010207...here are some pics of how my engine looks...

83C_CamAroZ28

iTrader: (12)

ok ic...when u say custom chip...what do u mean?...im not all aware of the computer and chip part?...

Atilla the Fun

If you don't like the way it idles after you get the cam in there, or if the computer throws a code, you'll need to find someone who can help you with the tuning. In the old days, we tuned with a distributor wrench and a screwdriver, but these days we tune with the chip in the computer. Maybe you knew that much. Anyway, that cam is enough to make a difference worth swapping it in for, but mild enough to be a safe choice.
I don't know any more about it, I'm good with parts combinations, not electronics. But I know to ask five7kid who he thinks could help. He's a big fan of the computer-controlled QJet.

83C_CamAroZ28

iTrader: (12)

o ok...yea that cam sounds like something im lookin for...cuz i dont want the engine to be to mean i just want it sum wat mean...thats y i was goin with a 305 L69 HO...but ill just keep the 350 instead and o with wat u guys have told me......

1986z-28

And If you want your engine to look better, a little chrome never hurt anybody haha, get yourself some chrome valve covers, maybe clean up your intake a little bit or throw a different one on. And BAM looks 100 times better, did that to my 305, and maybe throw some headers on there, IMO the chrome shorty headers look the best, so your engine will look better and have a little more kick to it.