Lq4 with 243 heads?
Thread Starter
Joined: Nov 2010
Posts: 808
Likes: 62
From: Toronto Ontario Canada
Lq4 with 243 heads? I got a very budget build and over winter I want to get more power out of my summer daily driver.My lq4 is in great shape and low milage stock with ls6 intake,228r cam 112lsa,truck maf,all else stock.Dyno numbers in sig.
Im picking up 243 heads to raise compression and getting longtube headers and make a custom y pipe,maybe new ls7 lifters/trays.My question is about the heads,Ill be reusing the rockers/springs/valves from my 317 heads with the pac springs.Can I reuse the tsp 7.4 hardened pushrods aswell?What head gasket is recommended and if I decide to mill the heads(.030) and do some porting will I need new pushrods again?I want to reuse what i have since I only put 100km on it this year since being installed.Im not looking to make a ton of power..just crack the 400rwhp mark and have a snappy response.
Any advice is welcome.
Im picking up 243 heads to raise compression and getting longtube headers and make a custom y pipe,maybe new ls7 lifters/trays.My question is about the heads,Ill be reusing the rockers/springs/valves from my 317 heads with the pac springs.Can I reuse the tsp 7.4 hardened pushrods aswell?What head gasket is recommended and if I decide to mill the heads(.030) and do some porting will I need new pushrods again?I want to reuse what i have since I only put 100km on it this year since being installed.Im not looking to make a ton of power..just crack the 400rwhp mark and have a snappy response.
Any advice is welcome.
Staging Lane
Joined: Mar 2007
Posts: 61
Likes: 0
^lol, if you dont know then STFU
heads all have the same rocker pad height when stock. If you dont mill and go to a thinner gasket, you will still be fine. If you mill you will need to get a shorter pushrod
heads all have the same rocker pad height when stock. If you dont mill and go to a thinner gasket, you will still be fine. If you mill you will need to get a shorter pushrod
Thread Starter
Joined: Nov 2010
Posts: 808
Likes: 62
From: Toronto Ontario Canada
Thats what I thought..317/243 heads all else being the same except chamber size.If I dont mill the heads the I can literally reuse everything from my 317 heads,and replace the gaskets with new gm gaskets for the 6.0
How much gain can I realistically expect from just the stock 243 and 1 3/4 lts? Im expecting a healthy 30-40whp
How much gain can I realistically expect from just the stock 243 and 1 3/4 lts? Im expecting a healthy 30-40whp
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Pushrods are cheap. Mill the heads, measure for pushrod length and run a .040 gasket and enjoy. Don't run anything less than a .040 gasket or you will run your quench too tight.
Thread Starter
Joined: Nov 2010
Posts: 808
Likes: 62
From: Toronto Ontario Canada
Ideally if I do mill them I think .030 would be a good bump up for the lq4 and the 228r cam.Plus longtubes should really help the motor in throttle response and bottom/mid range power.
no truer truth.. Thread Starter
Joined: Nov 2010
Posts: 808
Likes: 62
From: Toronto Ontario Canada
sounds like a nice setup,how do you like it? Do you mind me asking what power it put down and since you milled .030 and using stock gasket..what pushrod length did you need?
formerly twolow02fransen (2014-1-2)
iTrader: (27)
Joined: Mar 2007
Posts: 2,750
Likes: 0
From: mASSHOLE
truck put down 390rwhp 375rwtq on a mustang dyno threw a auto runs awsome im very happy with it also advanced inductions ported my heads i just did a TBSS intake manifold swap so it should be well in the 4xx range. im not sure what length the pushrods are since advanced inductions setup the whole package
Thread Starter
Joined: Nov 2010
Posts: 808
Likes: 62
From: Toronto Ontario Canada
It should be on the button 400rwhp.Right now having my stock manifolds and having clogged cats mixed with a poor tune has me leaving alot on the table.Headers with 3inch y pipe to my 3inch catback,243 heads with slight port work/milled,build a true cold air intake,might need new injectors and might port the throttle body should get me there after a new tune.If I hit 399.9rwhp Id be pissed to be that close lol
I'd still use that 228r cam, mill the 243's and get a fast......no problems hitting 400+ and I'm pretty sure it will make closer to 420... if ur gonna have it returned might as well do all ur mods at once and be done with it
Thread Starter
Joined: Nov 2010
Posts: 808
Likes: 62
From: Toronto Ontario Canada
Fast intake just isnt in the budget..nor do I think I need it for my goal.If I tear the motor down again after doing 243 heads and lt headers..it will be for an ls3/l92 topend overhaul and a bigger cam n/a..aiming over 450rwhp.Im far from that though.