Looking for guys who make 900+rwhp with turbo: block opinions
12-19-2006, 10:51 AM
#61
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Originally Posted by 427
The C5R would be slightly better than a LS2 in the mains, but weaker on the deck. It was designed around a road race engine that produces under 700hp. At 1200hp they have a hard time holding head gaskets, and the mains are moving all over at that level. My feeling is the LS2 is a better block if you add main caps, even better with a girdle. The new blocks should make all these old news for the high power LS engines.
Kurt
Kurt
Kurt
How do you think the deck on a LS7 block compares to the LS2?
12-19-2006, 12:04 PM
#62
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Originally Posted by Mike 01WS6
Wouldn't you then have basically an LS1 all over again (5.7L)? Since the 5.7L and the 5.3L cranks have the same stroke of 3.622" and the only difference of the 5.3L is having a smaller bore. So if you "bore it to ls1 cubes" then you'd have the same stroke and the same bore again.
I dunno if I'm confused or maybe I just found a flaw in the reasoning?
So what options do I have in obtaining 348ish cubes on an LS2. Is a $$$$ custom crank the only way to go? If so, I guess that kills that idea.
I guess I'm destined for a bore distorting LS1 block because I won't settle for a 90lb gain in heft with an iron block. My car's already a pig.
I dunno if I'm confused or maybe I just found a flaw in the reasoning?
So what options do I have in obtaining 348ish cubes on an LS2. Is a $$$$ custom crank the only way to go? If so, I guess that kills that idea.
I guess I'm destined for a bore distorting LS1 block because I won't settle for a 90lb gain in heft with an iron block. My car's already a pig.
You could use a LS2 block and a 4.8 crank and get 328 cubes. Nice healthy cam and spinning it 7200 should work really well with the Incon.
Were going to be working with ERL and W2W to see what the stock castings modified a little can do. Major and I both have been running LS2 blocks and making big numbers. I believe for most people out there a stock LS2 block with dowelled mains. Could last a long time at 1000hp. Tuning and assembly have a lot to do with that though.
12-19-2006, 12:21 PM
#64
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I see.
How much does the LS7 block itself retail for? Is it rather big $$$$?
A 4.125" bore (LS7) and a 3.27" crank (4.8L) gets me about 349 cubes. I'm assuming it'd be comparable to the C5R in terms of strength.
How much does the LS7 block itself retail for? Is it rather big $$$$?
A 4.125" bore (LS7) and a 3.27" crank (4.8L) gets me about 349 cubes. I'm assuming it'd be comparable to the C5R in terms of strength.
12-19-2006, 04:00 PM
#66
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My gut feeling is the LS2 deck is stronger, but I have not tested this yet. The big power cars like yourself are going to get the best stability out of the GM iron I would think, but the added weight on a drag car is a bummer. How much does your car weigh and how much do you need to weigh at your local races? All these new blocks look really promising, I can't wait. Dave Underwood's new billet Dart block was at PRI in the Dart booth, but they still need to finish machine before we get it. His car was running #3160-#3180 and is allowed #3000 at our local stuff, so the iron block in it needs to go.
Next year will be very interesting with some of these new parts.
Kurt
Next year will be very interesting with some of these new parts.
Kurt
Originally Posted by MajorSpray
Kurt
How do you think the deck on a LS7 block compares to the LS2?
How do you think the deck on a LS7 block compares to the LS2?
12-19-2006, 04:01 PM
#67
12-19-2006, 06:42 PM
#69
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Originally Posted by 427
My gut feeling is the LS2 deck is stronger, but I have not tested this yet. The big power cars like yourself are going to get the best stability out of the GM iron I would think, but the added weight on a drag car is a bummer. How much does your car weigh and how much do you need to weigh at your local races? All these new blocks look really promising, I can't wait. Dave Underwood's new billet Dart block was at PRI in the Dart booth, but they still need to finish machine before we get it. His car was running #3160-#3180 and is allowed #3000 at our local stuff, so the iron block in it needs to go.
Next year will be very interesting with some of these new parts.
Kurt
Next year will be very interesting with some of these new parts.
Kurt
I am really trying to concentrate on the Outlaw Drag Radial and Corvette Events.
The GM Performance block is a great option for the Drag Radial classes min weight is usually around 3400 lbs.
The Corvette Classes run around 3000 lbs that’s where it hurts and that’s why I ask about the LS7 block.
Last season the lowest I was able to trim down to was 3200lbs.
The car going through a mess load of updates right now.
The cage is getting updated to a 25-2/25-5 cert. and the rear is being changed from a 12 bolt to a 9inch.
I have no idea what the car is going to weigh after all that but I don't see it being a light weight.
I do feel that the GM blocks will be the first to hit the market running.
We will see thanks for the input.
Good luck with the Dart block it looks like a nice piece. Now I know why they weren't so eager to talk to me they already had there test pilot.
Keep us updated
12-19-2006, 09:56 PM
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We will post when we get the billet block in house and start filling it with parts. Looks like we will be using the cathedral port All Pro head with 4 head bolts for next year on Dave's car, they have done well so far.
We are changing a few things on Dave's car to bring the weight down closer to his 3000 min. I can't wait to see how the block does and what the car weighs!
Kurt
We are changing a few things on Dave's car to bring the weight down closer to his 3000 min. I can't wait to see how the block does and what the car weighs!
Kurt
12-23-2006, 06:00 AM
#72
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after all this block talk, can you stick a 6.0 crank in ls1 aluminum block? with 4.00 pistons. I really want to go Iron but if the aluminum is as strong as you folks are saying i might have to do that. the only thing that was holding me back from building my 346 was aluminum vs iron
12-23-2006, 02:29 PM
#73
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Originally Posted by Mr_president
after all this block talk, can you stick a 6.0 crank in ls1 aluminum block? with 4.00 pistons. I really want to go Iron but if the aluminum is as strong as you folks are saying i might have to do that. the only thing that was holding me back from building my 346 was aluminum vs iron
5.3 - 6.0 cranks are the same and will fit in all. If your staying with the 76. Aluminum will do for you.
12-23-2006, 09:52 PM
#74
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Anyone tried these babies? They claim their blocks have similar leak down to a cast iron block which is unheard of... but claims are free
http://www.cnblocks.com/splaysbc.htm
Not LS2 based I know - but they could probably take some power and keep a good seal. If they'd do a wet block version of their cross bolt - it'd be even better.
http://www.cnblocks.com/splaysbc.htm
Not LS2 based I know - but they could probably take some power and keep a good seal. If they'd do a wet block version of their cross bolt - it'd be even better.
01-10-2007, 06:15 PM
#75
Originally Posted by Beaflag VonRathburg
The Hardcore Racing guys are / were (haven't heard about it in a while) running a C5R block with a girdle in their black car. It was powered by an F2R procharger so they were definetly pushing over 1000 hp. I don't know a lot about the details except that a lot of work was done to the block and heads.
Last edited by stage274; 01-11-2007 at 09:21 PM.
