I was planning on getting a set of heads (243) tea stage 2

Do the 5.3 2.5 heads bolt on an ls1? is there any more benefit over them then the 243 route im wanting to go if they do work?

If this helps, my overall goal is to achieve 500whp or as close as I can get!

 

the 5.3 head has a smaller chamber ,raising compression a little.you will need some great heads with a custom cam and a fast intake to get near 500 rwhp.

 

Get the tea 243!

 

I'm actually planning on a custom grind. Not sure on what intake I'm wanting. I'd like to go big off the bat and get the 102 but ive heard that wont help as much as a 92 would considering im only doing heads and a cam for now (plus bolt ons) but the way I am I know I will plan on going alot bigger.... but then again I might go with a different platform when I do go bigger and start off different... so who knows. But what intake would you suggest?

Thats what I'm thinking!!! lol

 

The engine should make a little more power with the Fast 102 vs the Fast 92.
A ported Fast is what I would pick if I were trying to reach 500whp w/an LS1.

The 5.3 heads will bolt directly onto your LS1 block. The raise in compression will give a few more ponies and better throttle response.

If I were you I would consult one of the board member cam genius's about a cam/head combo before making your purchases.

Or get in touch with a few of the vendors you are interested in working with. They should have some suggestions.

 

So it would be better off going with a ported fast 102? Also as far as headers any suggestions on what size primaries I should run?

That sounds like a good idea! I'll definitely have to contact them and see!

 

Get the TEA stage 2, 243's with a 62cc chamber or smaller. You want 1-7/8" headers, and a ported FAST 102 w/102tb. Run either a true dual or 4" cat-back.
Here's a few cams to look over.
http://www.tickperformance.com/tick-...1-ls6-engines/
http://www.tickperformance.com/tick-...1-ls6-engines/

 

I was wondering about tick performances cams! I looked at the stage 3 but wasnt sure if that would be a good choice or not! Didn't know if it would be to big!

Ok now to hunt for the headers I got a 3" x pipe and two magnaflow mufflers coming that I bought off another user...

Now why do you suggest the stage 2s over 5.3s? any particular reason? I'm sure im going to go with the stage 2s but just curious. I like to know as much about everything as I can!

 

TEA stage 2, 243's have better flow, especially on the exhaust side. IMO, to hit the 500 mark you've got to be willing to go a little aggressive on you cam choice!

BTW, have you read this thread?
https://ls1tech.com/forums/dynamomet...rs-inside.html

 

Oh, I'm more than willing! lol

Thats the Stage 3 polluter correct? Thats one I was looking at but wasn't sure if it would go well with the heads. But It seems like it should. Its been getting good reviews and mentioned quite a bit!

 

after looking at that thread Im curious to do what I planned but minus cnc'ing the heads and see what it ends up with before I have them done at tea. but then again maybe not lol

 

Well since dynos vary so damn much you might need a real happy one to get to 500 rwhp I have stage 2.5/5.3 heads and am very happy for the money that they cost

 

Toss the idea of cnc'd 5.3L or 243 heads if you want close to 500whp with a stock cube LS1 shortblock. Aftermarket heads will be needed for such power levels. The 5.3L and 243/799 are great heads and perform excellent per dollar cnc'd or not. But they are no match to many of the aftermarket options such as AFR, Trickflow, PRC (aftermarket castings), Mast, etc. Fact is aftermarket heads are superior. Fork out the cash if you really want that big HP.

But if cnc'd GM castings is all the coin you're wanting to spend on heads, then the 243 (a.k.a. 799) heads have a slight edge over the 5.3L heads. Both sets are very similar in design, but the 243/799 castings do flow a little more on both intake and exhaust. With the same work done to each head casting, the 243/799 typically should result in a small power increase over the 5.3L heads.

 

I'm not super informed on heads, but with the 5.3 being a smaller combustion chamber, giving them higher compression, wouldn't they be a little better than the LS6 heads, at least in some applications?

 

Possible. But if one is getting either set of heads cnc'd (243 or 5.3L), I assume they would mill either set of heads to whatever desired size CC combustion chamber. Therefore both heads would have the same size chambers and result in the compression ratio. In this case the 243 head has the same CC's as the 5.3L head but is still the slightly better flowing head.

 

If I'm not mistaken I seen a thread where someone had the 243s and hot 500. With the link that 99blu posted only had a cam intake and exhaust and was 425 rwhp so with heads it seems doable. As far as intake I'm looking at a fast not sure size but most likely a 102. That sounds reasonable right right? Is be happy with 480 ish... I plan on a small nitrous shot. No more than 50 or so

 

trickflow 215 heads, ported fast 102/102 combo, patG custom 230's cam, texas speed true duals and 1 7/8 headers. and get good supporting mods so you can drive the car for longer than a week.

you should be real close to 500, probably 460-475ish hp.. which is over 500hp on the flywheel anyway!

 

And I wouldnt spray a shot of nitrous on top of a H/C package on a stock ls1 shortblock... you'll be on borrowed time if you do that.

 

500 rwhp out of a 347 is going to take more then just heads, probably aluminum flywheel, electric water pump, vacum pump and even with all that it is going to be almost a race motor with very little bottom end, you will need an expensive valve train and solid roller. Very little that you will buy for your 347 will work with a bigger cube combo if you are going to change up later on other than a 102/102 intake. I bought the stepped headers when I was just H/C and they seem to be able to handle the extra cubes now but I really should be using a 2" primary.

 

Know where to find information on their flow? I tried looking it up with no luck!

Oh, from what I heard a small shot was ok on stock bottom end with a good tune? Thanks, I'm kind of scared of nitrous anyways! lol
I don't truly expect to get the 500 mark completely. I'm honestly looking to get as close as I can for now. Then later on once I become unhappy and want more I will build the bottom end and go from there. Hell who knows maybe by then Ill boost it also, or even go for a bigger block lol. But Im just looking for something fun to play around with. My 500rwhp is wishfull thinking, can't blame me there lol! But even if I got 450-460 I think with the money spent I'll be pretty content. As for anything else I'm still in my research phase. I'm pretty sure I'll be going with the stage 3 polluter v2 for my cam. For heads I'm not to sure on yet!