Steve Burger

iTrader: (33)

In the next 12 - 18 months I want to do an LS2 402. I want better than 550 RWHP all said and done. Looks like the shortblock will be in the 4K neighborhood. I will also need a new set of heads as the AS 5.3 heads will not work well. AFR 225 or All Pro look promising for that. LSX 90/90 wold be another good option. Upgrade the fuel system is mandatory as well.

Here are the questions.

Would doing the top end stuff first and then doing the short block be a good route? I can't part with 7 - 8K at one time. a couple of smaller chunks would be managable.

Would the AFR 225 heads work with a TSP 231/237 cam without flycutting?

Could I tune a 346 with 42# injectors?

Thanks for any help.

sb427f-car

Good question, but I think you should ask one more, as I have similar plans for the future, but won't be doing that for more time than you're planning so...what's the status with Knock sensors in the LS2 Block on LS1 PCMs? Anyone close to figuring this out? HP Tuners? BS3? Or other available PCM, Standalone computers/software?

jrp

iTrader: (16)

KS issue has already been worked out, you can tap the side of the blocks and mount your ls1 KS.

beavis

iTrader: (15)

I heard that you can not use a double roller timing chain with the LS2 block

sb427f-car

ya herd!

Steve Burger

iTrader: (33)

OK, so KS aside, how well will AFR 225 heads work on a stock shortblock?

ZLEEPER

iTrader: (24)

I'm currently having a 402 built as well. 2 or 3 more weeks. I am going to get the 402 1st and use my AS 5.3l heads until I can afford heads better suited. I sure hate buying s*** twice. chris

Steve Burger

iTrader: (33)

I thought the chamber size on the 5.3 heads would bump the compression too high. Also heard these are bad on a 4 inch bore.

ZLEEPER

iTrader: (24)

The heads are by no means optimum, but I am having the chamber opened to match the bore, using dished pistons w/valve reliefs, and 7.35 pushrods to get by until I get adopted by a rich lonely **** star j/k chris

Revelation222

Is there a sponsor that sells the LS2 short block now?

Steve Burger

iTrader: (33)

Are you building the shortblock around the old heads? Will you have issues with the way you did things if you go to a good set of heads? This is wht I was thinking that getting the heads first may be the way to go.

Oh and if your looking for a **** start to adopt you, get one with lot of girlfriends not a lonely one.

Brains

iTrader: (7)

... and don't forget YOUR friends when you get adopted...

Steve Burger

iTrader: (33)

OK so back n topic. This seems like a chicken and egg deal. Would it be best to do the upper half first or the shortblock first? I know that the whole nut at one time is best but that ain't gonna happen unless I can successfully pick 6 numbers.

Bryan@LME

iTrader: (4)

LME has a real nice LS2 402 shortblock. The sale will be in the new GM High Tech. The shortblock has a Callies 4.0" crank, Manley pro I rods, Wiseco custom pistons w/ horz. gas ports, comes standard with .047-.047-3mm rings good for 400+ shot of gas. This ring pack also allows us to move the top ring down as far as possible to give you the thickest piston crown for high heat applications. ARP main studs and race bearings too. Since were running a custom piston absolutely any dome or dish cc is available. This shortblock basically come out of the box with all the upgrades and is good for 1000HP. The price is 5999 and comes with LS2 timing set, front cover and valley cover.

Bryan
LME
713-849-4505

Steve Burger

iTrader: (33)

Sounds good. But I am still wondering if the 5.3 heads will work with the LS2 block or will the AFR 225s work on a stock cube 346?

cyclerage

iTrader: (59)

I hav e a SLP LS2 402 sitting in my livving room, waiting for all my parts to come in. Its a very nice piece with all the conversion parts for 3995.
I am doing my shortblock this year then next year I will go after a larger size head.
Your going to need a bigger cam than the 231 if you want over 550rwhp. I'm goin gin the high 240- range. Hopefully have some dyno #s the middle of next month (everyone's prayers will be needed).
Jason

Slowhawk

iTrader: (12)

You can have the LS2 built to whatever compression you want and the valve reliefs can be huge if needed.I would spec the setup to be around 11.8-1 to 12.2-1 compression.AFR 225 heads work perfect and you would have to choose a cam to compliment the setup.Properly done 500+rwhp can easilly be had with pump gas.Forget about the KR issue.It's all BS.You can mount them on the block or just throw them away like I do.

BTW-the 231 Cam is way to small for your 402 goal.Of course your post kindof confuses me since you start off with the 402 and then ask about the 346 in the end

Bull_in_a_china_shop

iTrader: (1)

hey steve, I just did the 231/237 tsp and am running afr 205's . BUt I did cut the pistons. It was acutally very easy to do. I work at state farm, so I'm in town 4 days a week if I can help w anything. etc.

Steve Burger

iTrader: (33)

Well I am trying to figure out how to do this in steps. I can't do this in one big bang. So I want to:

A - Get the AFR 225 heads and fast 90/90 for the 346 and then use them on the 402 latter. With this route, will the AFR heads work well on a 346? Will the valves clear the cam? I understand that the AFR heads are best on a 4.00" bore. Will that cause problems? The fast 90/90 will work but be better suited to a larger cube engine. That's not an issue as they will be on one latter anyway.

OR

B - Get the 402 with a better cam and use the AS 5.3 heads and LS6 intake. Upgrading the heads and intake latter. I know I can get the pistons set up for whatever I want. I know I can spend the $$ toget the 5.3 heads opened up for the 4.00" bore. Is reworking the heads a waste as they will be replaced? Is selecting pistons for the 5.3 heads knowing that I will upgrade going to be an issue? Can the 5.3 heads and the LS6 intake support 500+ RWHP in this configuration?

Either method has a set of compromises. I am trying to figure out what has the least negative impact long term.

I am just trying to get a sense of what is the best route. I hope this clears up my question.

Steve Burger

iTrader: (33)

Yeah let me know when you are in town. We are trying to get something regular set up around here so we can get to know each other. Seems like a lot of us are building and it makes sense to have a support network.