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im ready to start a new build.. i built my forged 30 over 6.0 over ten years ago. i have a set of TEA CNC ported 241s on the engine now, running a original ASA cam. this time im looking to step up to a BTR stage 3 or Titan 5 cam.
im wondering how much im going to leave on the table if i stay with my current heads as opposed to the likes of TFS , AFR mongoose or even PRC 2.5s. im going to keep my LS6 intake , 36lb injectors and 78mm MAF for the time being.
the old setup made 393rwhp the way it is now with a Yank SS3600 and a Moser 12 .. some new opinions would be great. definitely staying N/A for this build.
Nice setup. Honestly man, the biggest restriction I see is the ls6 intake setup. What are your ET and trap speeds? 393 could be a lot depending on the dyno. Those are really nice cylinder heads. I wouldn't bother changing them before I changed out the intake for a bigger one as it's holding the whole combo back already. Sure you could do a camshaft with more lift and more duration that would move the power up higher which is fine because you have a 3,600 stall but don't bother changing the cam without changing that intake. I think you'd be disappointed If you just change the camshaft.
Nice setup. Honestly man, the biggest restriction I see is the ls6 intake setup. What are your ET and trap speeds? 393 could be a lot depending on the dyno. Those are really nice cylinder heads. I wouldn't bother changing them before I changed out the intake for a bigger one as it's holding the whole combo back already. Sure you could do a camshaft with more lift and more duration that would move the power up higher which is fine because you have a 3,600 stall but don't bother changing the cam without changing that intake. I think you'd be disappointed If you just change the camshaft.
its only been 1/8th mile in this combo. when it was fresh it went a best of 7.58 at 91 mph with a 1.60 60ft .. regularly ran 7.6Xs for years after that. recently shes 7.7Xs still...11 years after i built it. on a dynojet Dyno she pulled 388 , on a mustang after retuning (different tuner) it pulled 393
theres a lot of examples of guys making 450+ rwhp with a LS6 intake...so im not sure about that one. the ASA pulls nicely but falls off hard on the top , as one would think it should. the ASA lobe design is ancient, even if GM still uses it in crate engines. obviously the motor would easily respond to more cam and newer lobe design. the ASA is tiny in regards to 370 cubes.
Originally Posted by Doug G
Whats the end use ?
Drag
Auto x
Roll race
Bragging rights
????????
its a 1500 mile a year streetlight warrior with a decent amount of track time.
Being auto, I wouldn't worry too much on the dyno numbers, they will never look good lol .. But I would say moving to a fast 102 or an msd would be the way to go to get more in it. Also do a Chris1313 style OTR intake if you don't have one.
I would also focus on getting the compression up to gain a bit more power as well.. So with aftermarket pistons, I assume you have enough clearance to either mill the heads or run a thinner head gasket.. What is the rest of your setup look like?
It'll cost half as much to get a better flowing intake that will also take a 92mm throttle body and larger MAF, than throwing on brand new aftermarket heads that still have to breath through a 78mm throttle body.
Those heads are legit. Are they they best? Nope. Are they extremely soild? Yep.
I would update the cam because that cam is literally from 15 years ago and technology has come a long way. Then also as noted I would do a FAST90/90 style intake and TB set up. The LS6 is a good factory intake but on a nice HC set up like you will have, its definitely leaving power on the table.
I would also focus on getting the compression up to gain a bit more power as well.. So with aftermarket pistons, I assume you have enough clearance to either mill the heads or run a thinner head gasket.. What is the rest of your setup look like?
nothing is stock but the block and crank... it has eagle 6.125 forged rods and forged Mahle pistons with 1.5mm , 1.5mm , 3.0mm ring packs.. however im probably going with new pistons on this next build.
Originally Posted by 02EBC5Z06
Being auto, I wouldn't worry too much on the dyno numbers, they will never look good lol .. .
im not worried about dyno numbers at all.. id like to modernize the setup a bit and try to get in to high 6s in the 1/8th totally N/A and streetable ( ive had many cars that are barely streetable , i dont mind dealing with it.)
Combination is everything. You will never accidentally make big power numbers in this hobby. Gotta get the air in and then, you gotta help the engine get the air out. The LS6 intake is a terrific runner in stock form, matched with a 78mm tb, works great with good heads. Going with better heads gives you opportunity for more power, so why limit the opportunity with the LS6 intake?
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Upgrade my heads, or no? 
