Doug G

.0325 per side. even less.

fast89stang

iTrader: (2)

Yeah right. That's what puzzles me, when the say the valve is shrouded too much in a 6.0. I guess it could be true, it just doesn't seem like it could help much. But Im just a mechanic, not a physics major. LOL Or whatever studies that stuff.

crossbreed383

iTrader: (1)

What part didn't you understand Steve???
The OEM aluminum block doesn't seal up as well as its iron counterpart.

speedtigger

iTrader: (16)

It is the sense of proportion that is the problem for me.

Lets say that we accept the idea as true that the bores are more rigid and stable in the iron block. The question then becomes how much right? How much more power would sneak past the rings of an LS3 block versus an LQ4 block?

Then we have to consider how that compares to 12 more cubic inches, valve unshrouding, 100 pounds of weight loss and the .32:1 extra compression that he gets with the LS3.

The extra displacement is worth about 19-20 horsepower at 1.65 hp/ci. The hundred pounds is the equivalent of 10-15 HP at his power to weight ratio? The unshrouding and a few horsepower for the extra compression too.

So, you would be suggesting that 35-40 horsepower or so will be leaking past the rings on his LS3?

I like the math for the LS3 myself.

crossbreed383

iTrader: (1)

Just a thought here Steve...
You have gone out of your way to to amass a list of the fastest SBE cars and what they run or seem to make for powe.r
Of the fastest cars YOU have claimed see to make in your words, extra ordinary power, i believe they were/are all 6.0 iron block combos????
Hmm..............
I'm not saying his car wont run faster, i just don't put the same merit in the 12 cubes, and shrouding problem that you are is all

Hell look at your heads, they seem to work on a small bore just fine

speedtigger

iTrader: (16)

And 100 pounds weight loss and more compression. Although, I did forget to include the fact that the aluminum block will expand and lose about .004" in quench when the block gets warm. So, only about a 1/4 point of additional compression after you back that out.

Have you seen evidence that the LQ4 iron block's cylinder seal up better than the LS3? I don't doubt that is the case, I just haven't seen any tests on that.

crossbreed383

iTrader: (1)

I know with my own stuff the difference in oil I was/am getting out of breather tank compared between alum alloy and iron block
Also some other little things I have noticed that I feel are contributed to a better ring seal IMO

fast89stang

iTrader: (2)

old motor was 9.6 stock compression, with heads milled .020, this motor stock is 10.5 and the heads will be milled 050. I am just hoping the suspension is more forgiving with the weight off the nose. The car is working pretty good, but this cant hurt. I will keep you all posted. The heads I am hoping will be done today. Maybe I can get pistons notched and heads assembled to get this thing put in this weekend. If so, we will probably have it out next weekend.

crossbreed383

iTrader: (1)

When I went with my Ls3 block I def noticed the car was more forgiving on certain tracks, but I regret not working on car more with the iron engine as I felt it made more power !!!
You may have to take some spring rate out of the frt end as well if its a coil over setup?

fast89stang

iTrader: (2)

I actually have 14x130s on front now, maybe they will work ok with the aluminum block.

fast89stang

iTrader: (2)

Doug, do you remember what length pushrods you have? Part number on intake gaskets?

crossbreed383

iTrader: (1)

I had 14-140s and went to 110s to get it to work right

fast89stang

iTrader: (2)

Great, just what I needed...more suspension work. lol Machine shop thought I was nuts for milling .050. They charged me as such too. 175.00 to mill my heads. They said I killed the heads.....

fast89stang

iTrader: (2)

Wonder how bad port alignment will be off on intake? Or is it crappy enough with the vic jr to not be worried?

crossbreed383

iTrader: (1)

My heads are milled .035 and alignment with a Supervic is horrible.
Would need to mill intake and run no gasket to get it close

speedtigger

iTrader: (16)

Interesting. Were they both the same displacement and power level? Did they both have the windows in the main webs?

crossbreed383

iTrader: (1)

I have had a factory 04 Lq4 block , a 2012 ish( bought new so I assumed it wasn't too old) LS3 block - 408-416 cubes-same everything within about 30-35 hp-same stroke,OIL PAN,TRAY, piston ring pack,etc

And current 09' Ly6 iron block-makes about 40-45hp more on Nitrous than old N/A combos did up here

Doug G

7.250 (with stock .051 gasket, LS7 lifters) and not off the top of my head.

Did a little search....HERE THEY ARE.

fast89stang

iTrader: (2)

well crap. I wish I wouldn't have milled do much then. I hate to order New push rods. I know mine could be different, but I hate figuring out what you need. Lol

fast89stang

iTrader: (2)

Turns out I had 7.350 pushrods in my old motor, they was a little off in my preload, but I thought I would try them. preload was at .043. Motor sounds good. It sounds a bit more powerful, and during the drive, it pulls hard. I didn't turn on the shift light, but when you mash it, it goes! It seems you can tell there is less weight on the nose, it just feels different. It does seem like I will need to change coil over springs in the front. The front feels like it did with iron block and 14x175s with the current aluminum block and 14x130s. But we should have some time slips to see this week.