suggestions 408 engine gurus 2slow? build sheet inside
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My engine w/built a4 and 12/bolt moser 4.11's 26/35/315 micky dr's (new) went 11.71@ 115.5.....1.606 60 ft. went through traps @ 6500 rpm's 3rg gear.I was hoping for low low 11's or high 10's.
408IronBug... 408ci LS1 Shortblock - incl. Block prep, Eagle 4340 Crank,
Eagle H-Beam Rods, Diamond Pistons, ARP Main Studs,
Balanced & Blueprinted,
1 3,600.00 3,600.00T
CC-875-16 LS1 'R' Lifters. High performance Replacement. 1 200.00 200.00T
AFR-1510F LS1 205cc cnc afr's 1 2,150.00 2,150.00T
COM-H1504043S Cometic Head Gaskets 2 75.00 150.00T
SLP-55002 SLP Double Roller Adjustable Timing Chain & Ported Oil
Pump LS1/LS6 GenIII
1 300.00 300.00T
CORE LS1 Short Block and Heads - no valvespings -1 600.00 -600.00T
CC-13755-KIT LS1 1.75 Rocker Kit with 5/16 Guide Plates 1 430.00 430.00T
CC-54-000-11 Keith Craft Custom LS1 cam 1 340.00 340.00T
ARP-234-4110 ARP LS1 head studs 1 199.99 199.99T
CC-26-921K Comp Cams Valve Spring, Titanium Retainers, Keepers and
Spring Seats
1 500.00 500.00T
CC-7955-16 Push Rods - LS1 7.400 5/16 - Stock length 1 130.00 130.00T
FAST-303608 FAST 36lb./hr Fuel Injectors 1 339.95 339.95T
GM-12585671 front crank seal ls1 1 16.09 16.09T
BCA-57080 Bearing 1 18.79 18.79T
MeZ-WP319S WATER PUMP FOR LS-1 1 479.99 479.99T
shipping overnight freight for water pump 1 80.00 80.00
SLP-100221 SLP LS1 F-Body Underdrive Pulley 1 199.95 199.95T
NGK-4177 NGK 4177 SPARK PLUGS 8 1.75 14.00T
GAT-K060763 Gates Micro-V Belt 1 48.99 48.99T
GAT-K040378 Gates Micro-V Belt 1 19.48 19.48T
NFM-8460N Oil Seal 1 14.43 14.43T
Last edited by Lacajun; 09-05-2010 at 04:52 PM. Reason: add text
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CC-54-000-11 Keith Craft Custom LS1 cam 1 340.00 340.00T
Where is your cam specs in all of that blah??
if you want to run the times, you need track gears; not street gears IMO. 4.30's and up.
I have been building these cars for 12 years, there is a differance between street car and strip car. You could run 9's in a 408.
Where is your cam specs in all of that blah??
if you want to run the times, you need track gears; not street gears IMO. 4.30's and up.
I have been building these cars for 12 years, there is a differance between street car and strip car. You could run 9's in a 408.
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comp part #54-000-11..........
int ext
gross lft .598 .608
dur @ 50% .234 .240 lobe sep .112
fast 78 mm intake and t/b as far as the gears go ...I was running out of gear with the 4.11's (26 in. Mickey dr's)
int ext
gross lft .598 .608
dur @ 50% .234 .240 lobe sep .112
fast 78 mm intake and t/b as far as the gears go ...I was running out of gear with the 4.11's (26 in. Mickey dr's)
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As i said in my pm to you, your entire topend isnt even suited for a 346. The heads and cam yes but a FAST 78 is old news. IMO you need to talk to Tony Mamo at AFR, the guys at Texas speed or Pat G to name a few. My friends 402 topend is going to be 104mm Lid, 100mm MAF, Ported FAST 102, AFR 215s or 225s and a custom cam. Mamo speced all of it out for him. The specs are 24x/ 25x .6xx/.6xx not sure about the LSA. Looks like you have some work to do to fix your 408.
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thats what i was thinking.....i got a good deal on the car .....it has a cr. moly 10 pt cage and a 12 bolt.The 408 has only 7k miles on it.Dude had 22k in tickets on the car.I got it cheep and I asked the guy why he went w/ the 78 mm set up /205 heads ...he said velocity.........lol.........
any hopes of getn low,low 11's or high 10's(N/A) with out buying new heads
any hopes of getn low,low 11's or high 10's(N/A) with out buying new heads
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thats what i was thinking.....i got a good deal on the car .....it has a cr. moly 10 pt cage and a 12 bolt.The 408 has only 7k miles on it.Dude had 22k in tickets on the car.I got it cheep and I asked the guy why he went w/ the 78 mm set up /205 heads ...he said velocity.........lol.........
any hopes of getn low,low 11's or high 10's(N/A) with out buying new heads
any hopes of getn low,low 11's or high 10's(N/A) with out buying new heads
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You should easily get to the low 11's, High 10's with a better top-end. I would make sure you Spec everything out though!!! Cam. Heads, to go with whatever Pistons you have. Find a desired Compression Ratio. With an A-4, 3:90 gears should be tall enough for you.
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thats what i was thinking.....i got a good deal on the car .....it has a cr. moly 10 pt cage and a 12 bolt.The 408 has only 7k miles on it.Dude had 22k in tickets on the car.I got it cheep and I asked the guy why he went w/ the 78 mm set up /205 heads ...he said velocity.........lol.........
any hopes of getn low,low 11's or high 10's(N/A) with out buying new heads
any hopes of getn low,low 11's or high 10's(N/A) with out buying new heads
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We need to know what compression you are?
Best advice I could ever give you, if I could do a 408 build again which I probabley will. I would have ran VERY high compression 15.1 or higher and run E-85 if I was building a N/A motor. I dont see why you couldnt get into the low 6xx hp range N/A with good H/C/I and 2'' Primary Lt's. Then Put a Progressive 300 shot and you are tickling 1000hp. Just my 2 cents.
I would rap that car out to atleast 7200rpms, if i was racing it.
You need a stroker cam in there, what were your dyno numbers? Numerous people on here have dynoed high 5xx hp 408's mine N/A was 53x and Matts Emplem Pro was 45x something.
Look at how the cams are high duraration to pull in air for the N/A motors:
Popular Stroker Cams:
Texas Giant:http://texas-speed.com/shop/item.asp...d=171&catid=44
Thunder Racing Stroker Series: http://www.thunderracing.com/shop-by...ain/Camshafts/
Best advice I could ever give you, if I could do a 408 build again which I probabley will. I would have ran VERY high compression 15.1 or higher and run E-85 if I was building a N/A motor. I dont see why you couldnt get into the low 6xx hp range N/A with good H/C/I and 2'' Primary Lt's. Then Put a Progressive 300 shot and you are tickling 1000hp. Just my 2 cents.
I would rap that car out to atleast 7200rpms, if i was racing it.
You need a stroker cam in there, what were your dyno numbers? Numerous people on here have dynoed high 5xx hp 408's mine N/A was 53x and Matts Emplem Pro was 45x something.
Look at how the cams are high duraration to pull in air for the N/A motors:
Popular Stroker Cams:
Texas Giant:http://texas-speed.com/shop/item.asp...d=171&catid=44
Thunder Racing Stroker Series: http://www.thunderracing.com/shop-by...ain/Camshafts/
Last edited by 99Ls1fever; 09-06-2010 at 09:48 AM.
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Was told 525 rwhp....but the guy never came up w/a dyno sheet.It could have just been sales pitch...lol.The car is very clean(as you can see in my album) and only had 60k miles(got a carfax too) 12 bolt moser,cr. molly 10 pt. cage,cold ac,new tires,nx n2o kit w/2 10 lb bottles ,built a/4 and a bad xss sound system.I got a good deal on the car but am new 2 the high tech world.I am 46 years old....sold my 10 sec old school BB 72 nova when I started seeing how fast these cars were... with cold ac... lol.If i can get down to a low 11 I plan on spraying a baby shot to knock it down in the 10's.So keep the info flowing...would like to come up w/something w/out having to do new heads.......thanks to all.
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The OP and I are in about the same boat coming from BBC's.
There's a lot of good info in here head cam wise.
Also, you may need to spend a winter verifying what's in the motor unless it came with receipts.
https://ls1tech.com/forums/generatio...-hit-dyno.html
https://ls1tech.com/forums/generatio...r-215-r-d.html
If your CR is high enough, I'd go with the 243/247 custom cam and flow check the heads if you have the cash left over.
Need to find out who ported your heads also. Plenty of hackers out there.
There's a lot of good info in here head cam wise.
Also, you may need to spend a winter verifying what's in the motor unless it came with receipts.
https://ls1tech.com/forums/generatio...-hit-dyno.html
https://ls1tech.com/forums/generatio...r-215-r-d.html
If your CR is high enough, I'd go with the 243/247 custom cam and flow check the heads if you have the cash left over.
Need to find out who ported your heads also. Plenty of hackers out there.