I am thinking about making a lq9 what is the most reliable cubes i can get out of an lq9 and still make decent power? Let me know what you huys think about this thnx, Mike

 

408ci would be a 4'' stroke crank and a .030 over bore.

 

Is that most cubes you can get out of an lq9 ?

 

You can build a 414c.i. with a 4.060 bore and a 4" stroke. I've seen people build a 422c.i. with a 4.030" bore and a 4.125" stroke.

Jon

 

Think smaller if you are gonna run a power adder. You will want the thicker cylinder walls. The 4.0 stroke is perfect these motors IMO. The 4.125 stroke can cause issues from the piston dropping so low in the bore. Not always but sometimes.......

 

ok thnx guys im tryin to do a high horsepower nitrous motor on pumpgas do you guys have any advice on heads, cam, etc.?

 

How big a hit you gonna spray? You might wanna post up in the nitrous section.....

And just buy the best heads you can afford period. That's what makes the power...

 

Well im gonna start with like 275 then work my way up and with the heads im trying to use factory gm heads cause they r supposed to flow great out the box and they r cheap thats y i asked that.

 

cheap and fast dont really go together but as far as stock gm heads id go with a set of L92 heads, if it was me id get them ported as well. Also if your doing big hits of spray id want the thickest cylinder walls i could.....i wouldnt go over 408 CI.

 

The lq4 is rated at like 1400 h.p. correct?

 

no...with stock main caps, you can safely get 800 hp out of it.

also, forget GM heads if your gonna ram all that spray down its throat. you will start lifting the head and push water.

if your gonna hit it that hard, you need a head with a thicker deck. (AFR, TFS etc...)

 

Man Dont go over a 408 with spray. If you do a cam have it specd out and have a custom grind thats what I did with my 370. I have seen turbo 370s push some serious power around that area. You doing a direct port kit. You will have to with that much spray. Also you need to start with a 150 shot get a decent tune then work your way up. There is alot that comes into play with nitrous you just dont throw a shot in there.

 

O yea i know im not just gonna thrw a huge jet in there and spray it lol wish it was that easy this is a father son thing between me and my dad im trying to figure out the best way to do this with a lq4 or lq9.My dad is the nitrous guy not me all for the boost haha im just trying to get the info for him

 

Get a LQ9, stoke it to a 408 and start working up to spraying a 300 shot at it. That's my plan, just make sure you put some quality internals in it. Like said above, get a set of well ported L92 heads and a nitrous grind cam.