Trying to justify to myself building a 427 is worth the extra $$$ over a 408. LS7 style heads look to flow better than 4 inch bore versions but question is how much power is really there to be had.
Not looking for a drag engine, something that can be driven a lot in F body and put down 550 or so RWHP, have good street manners, be reliable and accept a little N2O at track.
Lastly, anyone using Lunati rotating assembly in a 427? Have had good experience with Lunati in BBC's, looking for LS feedback.
What block are planning to use on 408ci or 427ci?? aluminum or Iron??
From those engine Id choose none LOL Go with LS3 418ci with the right cam/heads/intake will get you 550rwhp for sure and you can spray the car too and the price is awesome too..
is your car an M6 or auto?
Lunati is a great rotating assembly but expensive I used Wiseco pistons and Callies Rods and crankshaft in a couple of builds they're awesome and great price too.
GOOD LUCK
__________________ 01 ZO6 - Built 346ci H/C STS TT 559rwhp 530rwtq 9psi 701rwhp 669rwtq 16psi(Old Setup)
now N/A 346ci H/C 8:5.1 compression 370rwhp but not for long
Trying to justify to myself building a 427 is worth the extra $$$ over a 408. LS7 style heads look to flow better than 4 inch bore versions but question is how much power is really there to be had.
Not looking for a drag engine, something that can be driven a lot in F body and put down 550 or so RWHP, have good street manners, be reliable and accept a little N2O at track.
Lastly, anyone using Lunati rotating assembly in a 427? Have had good experience with Lunati in BBC's, looking for LS feedback.
If you're gonna use LS7 heads...those suckers can breath. You'll want as many cubes as possible. There are ported LS7 headed/ported LS7 intake 427's making 580 RWHP and daily drivers.
Call Katech, I remember they had some Cola cranks laying around they were trying to sell awhile back. Perhaps one of the best crankshafts ever made. Not sure what strokes they were though.
.
__________________ 1998 WS6 T/A 492 RWHP//495 RWTQ (w/cats)
LS6 427ci LPE short block, Ported stock TB, Ported LS6 intake, Ported LS1 heads, cam: 244/244 .610/.610 114 lsa, 1 7/8" Grotyohan LT's, 3" custom "Y" back to a Magnaflow Muffler, Built tranny...by a friend, Strange 12 bolt, 3.73 gears, Baer brakes, Hotchkis STB, LG Motorsports: Panhard Rod, LCA's, SFC's, G2 Super Springs, Hals all around, 315/rear, 275/front
Life may not be the party we hoped for, but while we're here we might as well DANCE.
As for block, trying to decide between LSX iron or Darton MID sleeved LS1. Neither is what I would consider cheap but both appear very durable.
Lunati has a solid reputation and I believe still forges in USA. Guess you get what you pay for.
Car is M6.
I would get the LSx and do a 454 with ported LS7 heads, that will get you 600 rwhp no sweat for a daily driver, plus you could still hit it with 150 or 200 shot at the track.
I would only do the sleeved ls1 if weight is an issue, and right now morris motorsports is selling ERL sleeved LS2 427 shortblocks 5000, 4500 if you can exchange either a LS2 or LS3 block.
__________________ 01 Z28- Magnaflow catback, A4, 4:10's, SLP Lid, more power coming soon......
sheesh wish i could throw 5K on a shortblock...and if you are looking for mid 500rwhp what do you plan on doing with your trans? my suggestion is call Joey at tick performance
__________________ 346 Forged bottom end,P&P 241's, Lunati cam, Ram VDS Pkg, Stage 2 TICK PERFORMANCE T56, moser 12 bolt...sooon #'s and 200 shot
old times with just exhaust and Dr's..
12.56 @ 110 - 1.85 60ft
If your looking to spray then a 4" stroke would be better. The 408 will make the 550 just as the 427 but the bigger cubes should allow for a smaller cam and better drivability.
The rest is all about budget but a big heavy Lunati crank isn't the best choice here. If you have to have an American forged engine then we go to the Dragon Slayer and Carrillo rods. I would go with a re-sleeved LS2 as well an save the weight on the block too.
__________________
MSD 8.5mm Superconductor wires w/ NGK $68 delivered guaranteed for life. HKE Precision Racing Engines 347-500 cid N/A, N2O, FI applications AFR, TFS, All Pro, Edelbrock, Dart head cam specials Ron Davis Racing.. radiators and heat extractors finest in the business
I have been doing a lot of searching this and other sites regarding sleeving. What I have found so far appears to support that the Darton MID sleeved LS1 block with wet sleeves is more durable than a dry sleeved LS2/3 or LS7 block.
As not everything you find on net is accurate, would appreciate any further feedback.
Pricing I have found so far is that wet sleeve version costs more but if I have to purchase a LS2 block overall cost is about the same. (have a LS1 block)
Appears consensus so far is the LS7 heads are worth the difference - especially if can run a smaller cam with better drivabilty.
Call Katech, I remember they had some Cola cranks laying around they were trying to sell awhile back. Perhaps one of the best crankshafts ever made. Not sure what strokes they were though.
4" Cola crank (from Katech), Callies Compstar rods and Diamond pistons in an LS7 case here. An LS2 sleeved would be o.k. too.
The LSX case was too heavy for my application.
__________________ Carl
Black 02 Stepside 1500 w/MM6 & warmed-over 6.0L Black 05 CTS-V w/warmed-over LS7 47 Olds 76 2-dr sedan Two-tone Teal/Turquoise Pimpmobile w/bone-stock L98 (SBC) and 700R4 New LS7 Project 06 KTM 950SM w/Leo Vince cans
Dragon Slayer crank is not an American forging. It's a good crank and finished here, but not forged in the USA.
You sure about that The Compstar is forged overseas
Quote:
DragonSlayer crankshafts are made in the U.S.A. for American Racers. Our LS1 crankshafts are machined from premium 4340 forgings.
Quote:
Compstar Crankshafts are a great value for the budget minded racer or high performance street enthusiast. These cranks are designed by our engineers, and rough machined to our specification on 4340 material forgings overseas.
__________________
MSD 8.5mm Superconductor wires w/ NGK $68 delivered guaranteed for life. HKE Precision Racing Engines 347-500 cid N/A, N2O, FI applications AFR, TFS, All Pro, Edelbrock, Dart head cam specials Ron Davis Racing.. radiators and heat extractors finest in the business
I would go 427ci. I have a 402ci a cola crank from ktech and callies rotating assemb w/ported l92's stock l76 in a m6 car. 520hp. with the new fast ported,i should get 540hp from it. a 427 should gain even more .
427 versus 408 
The Compstar is forged overseas
