Well I had some good races last night and was very pleased with how things went.

First race was against a mid to late 90's Eclipse Turbo with an intake and an exhaust. I figured with him being light and boosted he would win. We raced for a little over a 1/4 mile. I beat him bad out of the hole with a weak launch and he reeled in on the top end, but by the end I was a half of a car in front of him. I figure thats not bad for an LO3 with 180,000 miles on it.

Next race was versus a 89 Mustang Lx 5.0 and we raced for maybe a 1/4 mile or a little less. We went from like a 10 mph roll and by the end, I had about I would say one car on him. I was pretty excited to be ahead of a 5.0 and I even shifted out of first at 3500 rpm but wound out second to 4500 rpm where I always shift. The mustang has a K&N filter and the air silencer removed.

congrats on your wins
hard to beat those stangs,i'v beat every stang but one he's got a 351 modded out so i don't feel bad loosing to him

You guys aren't lying when you say those things don't rev!

Well I do that because everyone told me it would be fine to shift at 5000rpm but it just seems all power is gone at that point and I want my high milage connecting rods to stay put.

LOL at a 305TBI beating a 5.0 LOL

Hey it happenss. These cars are old, they all don't run like they use to.

Never laugh at a 305, especially with mods. I am at 423 FWHP and climbing out of my small bore TBI small block.

The stock L03 has laugh-able specs on the cam and tiny exhaust. With a decent full exhaust from the head ports back, a nice roller cam, and some chip tuning the L03 will wake up. My 350 has the same "peanut" cam and it pulls to 5,000 rpm pretty easily. I think with prom tuning a stock L03 would spin to 5,000 pretty easily, especially in first gear.

Cam specs are 252/262 @ .006, 179/195 @ .050, .350/.385" lift with 1.5:1 rockers, 109 LSA, 106 ICL.

You have 423FWHP N/A form a 305??? LOL LOL LOL post full specs on this!!! From the bottom end specs to the heads, cam, intake, exhaust....cause I dont believe an all motor 305 can come anywhere NEAR 400 HP

Yes, that's pretty unheard of. I dont beleave that either. With a carb and hi-rise intake and a cam with a target powerband of 6000-8000, maybe but not on the street. Post specs and dyno sheet.

Okay, here you go. Most of the little work was done in my Garage. The machine work was turned over to a good friend of mine. I used alot of GM parts even though aftermarket parts were at times only about 50% higher in cost, Budget Build kinda thing.

Block = 1983 4-Bolt main 305 (14010203 casting), Bored .040" over, Torque plate honed, Decked .025", ARP Main Studs, Align Bored

Crank = Stock GM Forged Steel (3941188), Lightened, Smoothed, Knive Edged, etc for less windage, balanced with the entire rotating assembly

Bearings = Federal Mogul Speed Pro Coated

Rods = X casting rods, Parting lines ground down, Lightened, Balanced, Shot Peened, Weights Matched, ARP Wave Loc 3/8 Rod Bolts, Reconditioned

Pistons = Stock L69 Hypereutetic Replacements, Flattops with 4 valve reliefs, -6 cc, 0.00" in the hole

Rings - Total Seal Gapless rings

Compression = 10.7:1 with 54cc heads, Zero Decked block, .038" compressed head gasket.

Heads - Ported 2004 ZZ4 castings ("463"s), cleaned up in my garage, final "MAX EFFORT" port work performed by my buddy in his machine shop, .100" longer valves than stock (1.94/1.55 Under Cut Stems, Swirl polished), 5 angle valve job, Forget the exact spring but they are meant for the cam and .100" longer than stock valves, .600 lift compatible. I had to use longer than stock push rods as well. Machined heads for Comp Cams guide plates after opening up pushrod holes in heads. Gasket matched to a Felpro 1206 (1.34" x 2.21")

Head flow @ 28 in/h20 with a 3.75" bore simulator (engine has 3.776" bore).
Lift------Intake---Exhaust
.100------57-------57
.200------123------118
.300------177------162
.400------223------183
.500------229------188
.600------238------193

Camshaft = Comp retrofit roller XFI280-H13 (280/288 @ .006, 230/233 @ .050, .576/.570" lift with 1.6:1 rocker, 113 LSA, 106 ICL) Cloyes Double roller timing set

Intake Manifold = Holley Projection TBI for "OLD" style heads with the same bolt angle. This intake is a dual plane, high rise, with 2" bores. Gasket matched to the Felpro 1206 intake gasket

TBI = TBI unit off of a Heavy Duty 7.0 liter TBI truck, 68# injectors at 32 PSI, 2" bores, thinned throttle shafts, radiused the entrance to the bores, sitting on a 1" tall open center TBI spacer, 720 CFM @ 3.00 in/hg

Headers/Exhaust = Hooker Super Comp 1 3/4" x 3.5" meant for a mid 70s Camaro with a 350. 3" duals with X-pipe (not used on dyno)

Ignition = Stock GM HEI EST small cap distributer (computer controlled) with MSD coil, MSD Module, Moroso Ultra 40 wires, AC Delco Rapidfires @ .045"

Oil System = Moroso Blue Printed Oil Pump w/ Pickup, Moroso Steel Shaft, Moroso 5 quart pan, Moroso Oil Control Kit, Mobil 1 5w20, 70 PSI Z/28 spring

Crankcase Evac = LT1 style Electric AIR pump pulling a crankcase vacuum of about 6 in/hg.

ECM = RBob's EBL with lots of tuning. 34* total advance @ 2,800 rpm.

Dyno Numbers (all rounded to the nearest whole number for simplicity)

RPM------HP----TQ
2,400----147----323
2,600----166----336
2,800----185----347
3,000----207----362
3,200----223----365
3,400----238----368
3,600----263----384
3,800----281----388
4,000----301----395
4,200----322----403
4,400----347----414
4,600----363----414
4,800----378----413
5,000----382----401
5,200----393----397
5,400----401----390
5,600----410----385
5,800----417----378
6,000----421----369
6,200----422----357
6,400----423----347
6,600----419----333

That is 423 FWHP @ 6,500 and 415 ft/lbs @ 4,500.

Isn;t the stock ZZ4 casteings just the '' 113"vette heads ? 171 cc port ...58 cc chamber ( you milled yours ) You definately got some good flow out of them for sure !

yeah LO3 isnt a bad motor with all bolt ons i got 14.7s out of it then i went to a 4bbl

NO, the latest ZZ4 heads are different castings than the old 113s. See here for more info. I am not the only one that has had good flow numbers out of them with a little work.

Yes they have been milled some as well.

https://www.thirdgen.org/forums/tech...num-vette.html

i seen the race in person and the eclispe is slow and wont race me since i beat his friend with a talon with a 18 psi on a upgraded turbo and forged engine with a good tune. I raced the 5.0 and beat it badly it is all stock lx with a hole in the h pipe and a only thing tune up wise it has is plugs.

Fast355's car is pretty well known on these boards, his numbers are true.

I love it when people come in here saying 5.0 mustangs are infallible. I've never lost to one =P

They clearly were not racing then.

Clearly. I'm sure I would have gotten smoked hard if they were.

Everyone knows the L03 is slow stock, especially the automatics, but they wake up with mods like any other V8.

My RS has run 14.73 @ 92mph and I have also beaten a 5.0. I'll admit I was very surprised but it was a great race and I just edged him out. It was a 5 speed just like mine.

5.0 stangs are quick, I know as I've owned an 88 GT, and they respond very well to mods.

I think the reason 305 third-gens are dissed so bad by owners of other performance cars is the fact that most encounters with them are against peanut cammed cars with horribly restricted exhaust and 2.73 geared with an automatic transmission that pulls great in first gear but then drops off with a huge desparity between 1st and 2nd gear.

The Mustangs all came with the good engine and have real dual exhaust systems. Most are 5 speeds as well.

Eqip an f-body with the same good parts and it will run with the 5.0. My L98 cammed Iroc with 5 speed and exhaust is faster than my GT. They are both 3.08LSD equipped as well.

I am amazed at how much torque you have comming out of a 305! I really need a roller cam

Just saw this one. The roller cam really has a great, modern lobe design on it as it is a Comp XtremeEFI cam. The Crane roller cam that I put in this same 312 with ported 081 heads gave me about 40 RWTQ @ 2,500 rpm above the L82 cam that came out before that. The Comp roller traded off about 25 ft/lbs down low for about 10 ft/lbs in the 4,000 rpm range. The Ported ZZ4 aluminum heads were the icing on the cake. Keep in mind that it is also 10.7:1 compression.