nazztman4739

iTrader: (6)

OK I want to build a ls3 427 I already have Afr mongoose 230 ls1 heads 65 cc combustion chamber I want to build a street car on pump fuel

1st I need help keeping the compression ratio good for pump gas.

2nd this is going in a 00 trans am I'm trying to push it to low tens or high nines is it possible? 4 speed auto car so far full weight.

3 right now looking for n/a but looking maybe at nitrous later any help I can do now before the complete build I can do to help with the transition.

slow trap

iTrader: (22)

depending on your cam choice,but between 11:5 or 12:0 or so would probably be close.just guessing but a stick in the high 24x/low 25x will prolly be close. that many cubes i would prolly even go slightly bigger.with a full weight car it will be tough getting it in the 9's n/a but mid 10's or so shouldn't be all that hard.

1989GTA

What octane gasoline are you able to buy in your area? Also what intake manifold are you going to run? It is going to take some doing to see nines. Tens is certainly doable.

nazztman4739

iTrader: (6)

I love a challenge so low 10 s I think may be my goal then probably a fast 102 intake 92 octane in my area

Tuskyz28

It can be done.... I almost got super excited till I seen you said it was a automatic car.

Danny

iTrader: (16)

I think low 10s is doable but you're going to match everything to make your combo as efficient as possible. A nice stall converter, gears, tires are just a few things you'll need.

nazztman4739

iTrader: (6)

Yeah I have a long road ahead of me I am ordering a short block in the next month does anyone know the dish I would need to keep it streetable and if I wanted to juice it later with minimum changes to hard parts

NAVYBLUE210

N/A Pump Gas Street Car
1. 11.5:1 Compression
2. I would consider Low Lash Solid Roller Cam from CAMMOTION
would allow 7500-8000RPM REDLINE and better high rev
Valvetrain stability! And 25-30 more HP with similar duration
(adjusted for lash) ~ 247*/251* .640"/.620"
LSA determined by Tony (cylinder head designer and/or Kip @
CAMMOTION
3. Consider having Tony Mamo Romance your heads for that last
12-15 HP
4. FAST 102 W/Mid Length Runners, or MSD, data should be available
In next 2-4 months HOPEFULLY!
5. Possible to reach ~700+ Crankshaft HP paying attention to ALL the
Details!
6. Would do 416", 4.0 stroke for better rod ratio, pin placement in piston,
Better Piston Stability at bottom of stroke especially at 7500RPM

I witnessed a 416" with AFR230s 11.4:1 243*/247* .624"/.624"
LSA 114*+2* HR, Romanced/Assembled by Tony make
663 Crank HP @ 6600RPM, 579 lb ft @ 5400, 510 lb ft 3400-6800 RPM
LLSR + Shorter Intake should be + 40 HP

I will let someone else chime in on STALL (~4000?)
And Suspension Mods.

Tuskyz28

Great post my guy!! Like mention attention to detail is a MUST and your components needs to be MATCHED to work together as a team!! If I was you I'll definitely do the 4.0" crank.... not only will it be more stable.... your motor will have better oil control which is very important on a real street car you plan on driving. The 10 extra cubes you'll get from using a 4.100" stroke isn't rough the pain in the ***. Plus let's face it stock sleeves don't handle long strokes well as if you had a aftermarket block with a longer sleeve. On to the heads and intake... The Fast intake out the box really isn't that good at all. I think one out the box will choke your motor down BIG TIME as the out the fast is known to choke towards the 7k rpm mark but that's where Mamo comes in handy at. I believe he can help the intake breath on over past the 7k rpm mark which is what you need for a big cube build like this. As far as the cam I'll definitely let him spec the cam due to him designing the head in the first place... I bet Tony knows where the valve events sweet spot is at... which goes hand in hand with the total package.

COSPEED2

iTrader: (7)

youll need a high quality stall/trans cooler and at least 390 if not 410 gears for any of the cam recommendations honestly. a reg hyd roller can get you there be it from cammotion or comps newer lobes.
the biggest details will be stall/trans/rear/suspension. you dont have to sink a boat load of money into your engine to get 10s. just a bit of seat time and attention to the other details i listed.

KW Baraka

iTrader: (7)

nazztman,

General specs on my 427ci LS3 being installed next month:

4.125" x 4" w/zero deck & .040" quench

12:1 Compression

HR valvetrain; cam = 244*/256*, 114+1, .645"/.655" lift

13* PRC Heads from Texas Speed = 265cc Intake, w/68cc chambers

AI Ported FAST 102 intake w/Nick Williams 102mm TB

Dyno and Street tuned by Henderson Performance.

Should put down 575hp to 600hp at the wheels and push my 4-door SS into the 10's .

KW

NAVYBLUE210

OP said he wanted to shoot for 9s, which is why I suggested LLSR,
10s are easily reached with the right HR.

BOLO

iTrader: (40)

There are members here running low 9's on HR with stock rockers/trunnions. It's all in a well thought out combo. Check out Tim Grayhatch86's ride. And he drives it to and from the track. Low 9's all day long,--Naturally Aspirated! No need to spend big money on shaftmounted rockers, which is what you need for any kind of solid roller cam.

COSPEED2

iTrader: (7)

there are a few non stroker fbodys running close to that as well as quite a few c5 and c6 guys running that with irs on hyd rollers.
i do understand the new hot trend is llsr but not everyone is qualified to run them and hyd rollers, esp new lobes out, have held their own for quite a while.

NAVYBLUE210

Bolo
Went through Gray Hatches 19 page build thread.
1. 2965lb! Mustang (400-? Lbs lighter then full weight f body)
2. Fully dialed suspension 1.28 60', 9.53 best W/ 416" (9.24 W/454" & E85!)
3. 12.0:1 comp and 7200-7500 RPM W/Super Victor & 4500 TB
4. C4 trans with 8"converter & 4.10 gears (416")

Car was OPTIMALLY set-up with ALLOT of attention to detail!
Not saying it can't be done (9s NA W/HR) for OPs build.
10s allot easier and 100-150 shot for 9s.

T&D shaft + quality lifters, how much more than stokers + trunion upgrade
+ top of the line Morels HR lifters to turn 7500RPM? $500.00?

Just food for thought, Don't want to start a fight with a Fellow Marine!
Thank You for Your Service!, Semper Fi!

gbtwo

iTrader: (4)

I vouch for the 416 build, that's what I'm currently building

COSPEED2

iTrader: (7)

Why is everyone trying to blow a hole in a budget build with shaft mount rockers etc? You can do this with regular run of the mill parts. A 427 should make big power anyway. Id use a different head, but that is my opinion. Youd be into them for alot less esp if you spend the extra for the hand work and im pretty sure the results on them speak for themself. Trick Flow. You can even choose between the cathedral or ls3 port config. And contrary to popular internet opinion you dont need to run any fancy rocker arms.
If you want some help building a 427 on a budget we have specd out quite a few of them. As well as custom cams for them. You CAN spend huge amounts of money and go fast or you can spend a moderate amount and still go fast. Still the biggest issues are rear/trans/stall/suspension.