427 versus 408
11-02-2009, 07:22 PM
#1
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427 versus 408 Trying to justify to myself building a 427 is worth the extra $$$ over a 408. LS7 style heads look to flow better than 4 inch bore versions but question is how much power is really there to be had.
Not looking for a drag engine, something that can be driven a lot in F body and put down 550 or so RWHP, have good street manners, be reliable and accept a little N2O at track.
Lastly, anyone using Lunati rotating assembly in a 427? Have had good experience with Lunati in BBC's, looking for LS feedback.
Not looking for a drag engine, something that can be driven a lot in F body and put down 550 or so RWHP, have good street manners, be reliable and accept a little N2O at track.
Lastly, anyone using Lunati rotating assembly in a 427? Have had good experience with Lunati in BBC's, looking for LS feedback.
11-02-2009, 07:44 PM
#2
What block are planning to use on 408ci or 427ci?? aluminum or Iron??
From those engine Id choose none LOL Go with LS3 418ci with the right cam/heads/intake will get you 550rwhp for sure and you can spray the car too and the price is awesome too..
is your car an M6 or auto?
Lunati is a great rotating assembly but expensive I used Wiseco pistons and Callies Rods and crankshaft in a couple of builds they're awesome and great price too.
GOOD LUCK
From those engine Id choose none LOL Go with LS3 418ci with the right cam/heads/intake will get you 550rwhp for sure and you can spray the car too and the price is awesome too..
is your car an M6 or auto?
Lunati is a great rotating assembly but expensive I used Wiseco pistons and Callies Rods and crankshaft in a couple of builds they're awesome and great price too.
GOOD LUCK
11-02-2009, 08:17 PM
#3
Trying to justify to myself building a 427 is worth the extra $$$ 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.
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.
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.
.
11-02-2009, 08:31 PM
#4
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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.
Lunati has a solid reputation and I believe still forges in USA. Guess you get what you pay for.
Car is M6.
11-03-2009, 01:50 AM
#6
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.
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11-03-2009, 11:29 AM
#9
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.
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.
11-03-2009, 09:05 PM
#10
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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.
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.
11-04-2009, 07:07 AM
#11
Launching!
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11-04-2009, 09:55 AM
#13
The Compstar is forged overseas
DragonSlayer crankshafts are made in the U.S.A. for American Racers. Our LS1 crankshafts are machined from premium 4340 forgings.
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.
