Paul_Hughes_87 T/A

what are the best heads for a lg4

thanks paul

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1987 Trans AM
305 LG4 5.0L
700R4
137,000km or 91,333miles
Black on gold trim
t- tops
K&N filter charger (ricers secret weapon)
Flowmaster 80 series 3 chamber catback
(NOW SHE SOUNDS POWERFUL!!!!!!!)

Sony X-plod deck
prestige 6 x 9s

Dan87IROC-Z

I've heard a lot of good things about the Vortech heads working well on 305s, and they are a steal from GMPP.

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission with 2.77:1 Rear End

Current Mods: Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip with 160* Thermostat, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET : 14.32 @ 97.7mph
(corrected for elevation)

Soon to come: LT4 HOT Cam, Air Flow Research 190cc Heads, 2800 RPM Stall Converter and SLP 3.70 Rear End Gears.

89BlwnRs

If you are keeping the stock pistons your choices are limited not only because of valve-to-bore contact but mainly because of combustion chamber volume. The stock heads have a CC volume of 55.3 cc, so even the 58cc Corvette heads must be machined a little to retain the stock 9.5:1 compression ratio. The other choice is WP S/R Torquer 305 heads which also have 58cc combustion chambers. You could get away with the 58 cc heads on a 305 but you will lose a little compression.

If you change the pistons you can throw on some AFR aluminum heads w/ smaller valves so they'll fit the 305's smaller bore. The AFR heads are highly regarded and could be argued as the best around.

Any more questions, please ask,

Jason

GOLD85

why wast you money on putting good heads on a wezzy 305 anyways. save your cash and build up a 327 or a 350 or something. you would get more power.

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when the green flag drops the bull$hit stops

350,performer RPM intake ,650dp, 700r4, headers, 3inch exhast

Willie

iTrader: (1)

Paul,
The heads are chose for my 305 are Corvette aluminum. If ported, they flow more than enough for a 305, have the weight savings over cast (19 lbs per head fully assembled vs. 44 lbs), and are relatively inexpensive. Of course you could go with World Products' S/R Torquer heads, but they are cast. Did you know "S/R" stands for stock replacement? Somehow, that just doesn't sit well with me. So for the money, there is no question in my mind that I made the best choice.

Jason,
Where do you get this information on stock combustion chamber volume? All my resources say all 305 heads have a 58cc combustion chamber volume.

Gold85,
Wezzy??? That's not what the owners of the '98 Vette, '98 Z28 convertible, '00 SS Camaro, and all generations of Mustangs (to mention only a few) have said about my car after blowing them off the track with my "wezzy" 305. Oh well, to each his own, I guess...


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Willie

Supercharged 1987 305 IROC-Z, Daily-Driver, Emissions-Legal.
12.57 @ 111 mph.
12.04 @ 114 mph (50-hp nitrous).
http://members.optushome.com/au/downunder1/rides/willie/willie.html

1987 "20th Anniversary Commemorative Edition" Z28 Convertible -- Super Chevy Show Class Winner, 1998.

[This message has been edited by Willie (edited December 17, 2000).]

CamaroMike

If your gonna build it small why not follow them all! That's right RICERS. Get as big an engine as you can between those fenders without going broke. No slam on a bad @ss 305 Willie but think of what a 350 set up like you have would do!

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84 Camaro ZZ4 with HOT cam. 1.88 60' (12.98 @ 105MPH E.T.)
Other Mods: You name it and I have probably changed it.

91 Firebird 5.0L TBI

ASE Certified Auto Tech
LIVE AND DIE BY THE ALMIGHTY BOWTIE!

Willie

iTrader: (1)

Mike,
I agree with you. There is a method to my madness: First, I wanted to keep my car original (305, that is). Second, I wanted to squeeze as much power as I could out of it. Like you said, you can always stick the biggest motor in between the fenders, but it seems to me that everyone does this. I know $$$ is a driving force and that it's more cost effective to build a 350 for example, but at this point in my life, $$$ is not as big an issue as when I was younger. I know there aren't many of us who build 305's, which makes me kind of unique.

Here's the end result: I had my car dynoed last year. The tech emphasized to me before running the dyno not to have any expectations -- that the results would be real world real wheel horsepower figures -- that the results would be lower than my expectations. After the run, the tech took the printout directly to the owner of the shop, where they mulled over it for a while. Then the owner brings it over to me and says, "VERY impressive for a 350!".

I replied, "It's not a 350."

Then he said, "At least a 383, huh?"

I could tell he did not believe me when I told him it's a 305. The same kind of thing happens at the track. I see a lot of disbelieving faces when I tell them it REALLY is a 305. I absolutely love this!!

What I don't like is when someone "assumes" a 305 is slow and that nothing can be done to help it along. Tim Burgess' and my 305 are living proof that our "displacement challenged" 305's CAN run with the big boys!!

Willie



[This message has been edited by Willie (edited December 17, 2000).]

89BlwnRs

Well Paul there is a book out that deals with Camaros and I think it's part of the Best of Hot Rod series or something. I own this book but I'm on vacation until New Years so I can't get it for you. In this book they take a stock L03, throw on some Corvette heads that are shaved like I said, put on a full 3" exhaust (TES headers, 3" cat, and 3" flowmaster cat-back), a cam, and an Edelbrock Intake, plus a custom chip. Afterwards the car put out 285 HP with the stock throttle body. That's not bad, and I would guess after all the work done to the engine the stock TB was a sery serious bottle neck. I'm sure the additon of a Holley 670 CFM TBI unit would have boosted HP to well over 300 HP. Also, the L98 Vette heads could be ported, better valves installed, better valve job and a more agressive cam installed and you'd definetaly be seeing 350 HP or so out of a 305. That's not bad at all.

Just a sign to all of you out there that for a few bucks the 305 can be made to perform. 300+ HP isn't bad, especially since the new LS1 Z28's today only put out 305. The torque curve on the engine they built was extremely flat, providing good power throughout the RPM range. The Vette heads are only about $800 assembled and are a great buy.

Just somet thoughts and opinions, hope this helps you out Paul, as much as I want a 350/383, I kinda like to stick to 5.0 L so the Stang guys can't complain that I have a bigger engine. Besides, that is what our cars came with.

Jason

[This message has been edited by 89BlwnRs (edited December 17, 2000).]