Lq4-Looking to boost up the compression
Lq4-Looking to boost up the compression Time for something new, I ditched the LT1 and looking to run a LSX with a Carb
Car weight- est 4500lbs give or take
Hp/trq Goals- 420 RWHP would like to shoot for 450 /NA no power adder
Tranny- Built 700r4
Rear End- I have a 8.5 10 bolt already built
Possibly 150 shot after the Hp/trq goals- not 100% sure on this part though
Car is not a daily driver- Will see little to no track time, mainly a street car on weekends. Also not concerned with smoging
Pump gas
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Motor will be a lq4(just because I can get one real cheap). I already have a basic parts list for common upgrades like arp rod bolts/ported oil pump/long tube headers etc. etc. I can go on.
My main concern and area I'm seeking help in is upping the compression of the motor. Thinking 10.5.1? or so.
I want to run with a set of L92 heads (btw any sponsors on here doing good port work? Someone that can also offer me a custom specd cam as well)
Plan is to tear down the motor and do a little cleaning with new bearings etc, So since everything is apart I want to swap in some new pistons to help boost up the compression as well with the l92 heads, Any suggestions? (part numbers please) On about a $700-750 budget a decent set that will handle the 150 shot if I decide to toss it at the motor.
Basically wondering what combination with some milled L92's/Head gaskets/pistons can get me to my compression goals. Looking for suggested parts numbers so I can buy everything needed for the short block so when I get the motor home I can slap on my heads/carb intake and carb.
Car weight- est 4500lbs give or take
Hp/trq Goals- 420 RWHP would like to shoot for 450 /NA no power adder
Tranny- Built 700r4
Rear End- I have a 8.5 10 bolt already built
Possibly 150 shot after the Hp/trq goals- not 100% sure on this part though
Car is not a daily driver- Will see little to no track time, mainly a street car on weekends. Also not concerned with smoging
Pump gas
--------------
Motor will be a lq4(just because I can get one real cheap). I already have a basic parts list for common upgrades like arp rod bolts/ported oil pump/long tube headers etc. etc. I can go on.
My main concern and area I'm seeking help in is upping the compression of the motor. Thinking 10.5.1? or so.
I want to run with a set of L92 heads (btw any sponsors on here doing good port work? Someone that can also offer me a custom specd cam as well)
Plan is to tear down the motor and do a little cleaning with new bearings etc, So since everything is apart I want to swap in some new pistons to help boost up the compression as well with the l92 heads, Any suggestions? (part numbers please) On about a $700-750 budget a decent set that will handle the 150 shot if I decide to toss it at the motor.
Basically wondering what combination with some milled L92's/Head gaskets/pistons can get me to my compression goals. Looking for suggested parts numbers so I can buy everything needed for the short block so when I get the motor home I can slap on my heads/carb intake and carb.
Last edited by BOXCHEV; Sep 10, 2010 at 12:09 PM.
Just mill .030 off the heads and you are at 10.5
Most common LQ4 specs
Pistons = 6.7cc dish
pistons = .007 - .010 above deck
GM 6.2L head gaskets = .051 compressed
head gasket bore = 4.065
Most common LQ4 specs
Pistons = 6.7cc dish
pistons = .007 - .010 above deck
GM 6.2L head gaskets = .051 compressed
head gasket bore = 4.065
