the current motor in my truck is pretty strong and fun but looking to spice it up i have been looking to see how hard to bore my motor to a 6.2.

heres my current specs and adyno run and street pull made 368 to the tires
stock rebuilt lq4
230/232 cam
longtubes
80e trans 3200 circle d
e fans
tbss intake
90mm
22in silverado ss replica wheels

now my question is would i gain a stronger truck with the biggeer bore and 243 and different cam.

 

If the engine is already rebuilt, it isn't worth the trouble, time, money to gain 12 cubic inches / .2 liters. You have a pretty good sized cam for a truck..I'd throw some ported/milled heads on it like it is. Should put you well over 400 at the wheels with additional flow and compression.

 

Agreed. You didn't specify what heads you are running, but I'm assuming "stock LQ4" means you have your stock 317 heads. You will get your most cost effective gain by going with LS3 heads and intake, and even better by going with a new cam optimized for that setup.

 

You'd be amazing at what you gained if you swapped out those big *** wheels, 22's aren't dyno friendly in the slightest. Other than that it seems like a decent setup, maybe some heads, but sounds like a nice driving truck.

 

Not trying to ignite the LS3 head on small bore argument but purely from a cost perspective, I was thinking some ported 862s with a slight mill..59cc chamber or so(bigger intake valve). Might leave some HP on the table at the top of the RPM range but all that delicious compression and keep the same cam. Would be a torque monster and depending on the port job would likely still put really impressive numbers down. Seems ideal for a truck.

LS3 heads are relatively cheap but $400 cam, $200 intake eats up the savings. And stock, LS3s are about the same combustion chamber size as 317s right? 862s start about 8cc less. Maybe we are in 6/half dozen territory here. My primary concern is the dished pistons in the LQ4.

 

No worries there. Point being that his H/C/I setup is mainly what's holding that engine back for more power. Plenty of options on which route he wants to take. 862's or 243's aren't a bad choice as they'll allow reuse of the TBSS intake.

 

sorry guys i have 799 heads milled .20

lol i know the 22s are holding back alot and the 80e trans but i dynoed with the 22s because thats what i mainly run on the street. havent gotten to the track with the 17s for a time yet though

 

Get the intake and 799s ported, or step up to LS3s with an eventual eye on a LSA blower setup.