Currently I have 853 casting heads on my 2000 Z28 m6 with the LS6 intake, 373 gears, and a 224/228 .581 .588 112lsa cam and made 392rwhp and 375lbs tq on the Dyno with what's listed above with the exception of the 373s. I picked up a pair of 241s from a 2002 Camaro SS and am trying to figure out what to do to get the most out of them that'll go well with my setup. The idea I've got for them so far is Port/Port match, Polish exhaust side, .2 mill, 3 angle valve job, and bowl blending. And then to go with that, cometic .040 head gaskets, 7.375 pushrods, ls7 lifters, and arp studs.

Does this sound like a good plan for the heads for my setup or does it need to be changed up a little bit?

Thanks guys,
-Alex

 

Sell the 241s and buy some 243s and have them CNC ported and gain 35-50 HP. The 241s work good also with a CNC port job but the 243s will out flow them. Just depends on your budget and what you want to spend. The 241s flow about the same as your 853s anyway.

 

Send them to http://www.totalengineairflow.com

 

AI claims "40-55rwhp SAE range over the as cast 241" with their High CR CNC package, alone.

They claim 40-50 over "as cast" 243's, but the as cast 243's have a gain over as cast 241's, so your best best is 243's, but don't think the 241's can't make power.

http://advancedinduction.com/LSX/AiLSxCylinderHeads.php

 

I dident have much money so while mine were off I milled .015 and did a good valve job on them then bolted em back on.

 

You can send AI your 853s for this option and it wouldnt be any different and then you can try to get $100 for the 241s.


Good read: https://ls1tech.com/forums/dynamomet...o-results.html

 

your best bet,dollar wise,is to send your 241s to one of the sponsors mentioned.properly ported with the right valve job,those 241s will make plenty of power.
if money is tight,AI has a lower cost option that involves,cleaning,inspecting,valve job and milling to your spec.
the right valve job alone is worth a few horses..

 

I wouldn't even bother porting the heads. Just a good valvejob and blending on the 241's will make great power for maybe a $300 investment.

 

Thanks for all the responses guys. I forgot to mention I will also be throwing some 42lbs injectors. With AI's 241 choices should I get 219 CC heads or their high CR 219 CC heads? Which would go better with my setup? And what should I do about head gasket size or pushrod size if I go with their heads?

 

HCR will get you the most power. AI can answer your questions about gaskets and pushrod size.

 

If your planning on keeping your car forever(it's your dream car) sell both your 853 and 241 castings and go get a set of the best heads on the market and be done... Trick flows, afr, mast, I'm going to get Texas speed as cast 225s...for the money you put into rebuilding the 241s you could just get some sick *** heads

 

I'd do the HC241 setup if I was gonna send them in

 

I would send your currant heads in as you won't have to get new valve covers and coil brackets

 

Like Mac said, AI will answer all of your questions for you. Remember, to achieve the higher compression, they have to shave the heads down, so that brings your valves closer to the top of the piston.

You will more than likely be using a stock thickness gasket.

 

Whats the stock size? Other dude running these heads with a bigger cam than the OP used Felpro 0.040 gaskets and ran 11.5:1

 

Stock is .052 to .055 crushed for the graphite gasket, and iirc, the MLS is .060.

I'm not saying he can't necessarily use a thinner one, just saying that he needs to be aware of the decreased PTV clearance after they mill the heads, and buy parts accordingly.

 

Stock gm Mls head gaskets are .051-.053 compressed

 

The HC241s he is quoting maintain stock PTV.