im building a twin turbo 70 chevelle, and im starting to look into my short block. this is going to be a street / show car and will never see the track. i would love to be over 1000hp but not sure how to get there. i know a lot of guys are running AES shortblocks with good numbers. are they the best? how many cubes is too many or too little? and whos the best builders? im probably going to run with a new block and new forged internals so i want to do it right the first time. thanks

 

lsx 427

 

cost wise .. a 370ci or 5.3 fully forged .. if your rich.. then id do that ^ lol

 

i thought a 427 was a little too big for boost?

 

It sure isn't. If you seriously want the BEST, get with Kurt Urban and get one of his Dart Billet Block 440CI packages.

 

just get a big turbo..

I just got my LSX block a few weeks ago, im going 427 with it.. A ways away still, but its a start.

 

Big twins? I've been reading that 400ci seemed to be the most efficient for bost or is it worth the bigger cubes?

 

The shorter the stroke the more reliable the engine will be. Think 347/364/390ci all will turn 1000+whp with the right parts and will be easier on bearings becoming more reliable. Big ci is fun, but not required.

Race car, go big engine and big boost.
Street car where reliability matters, smaller engine (short stroke), big boost.

 

just put my deposit down on an AES 390, going with twin TC66's from turbonetics, 317 heads, yella terra rockers, dual springs, callies crank/rods, diamond pistons... my goals are 800 minimum, 1000rwhp ultimate goal. Brian at AES said ill make 800 on accident.

 

I would send those Yella Terra rockers back immediately and run stockers with trunions. That is, of course, if you would like your new motor to last.

 

Was talking with Brian and he said the trunion up grade is good but he said at the 1000hp level, they've seen many cases where the stock rockers actually grab and pull the valve into the guide. He said ill need something with a roller tip and he said the yella terras are a good rocker for a good price. Just reiterating what the guys at AES told me.

 

Brian seems to be a good dude and I'm waiting on some quotes to come back from him but I will have to disagree on the rocker issue. If you want a set of crane gold adjustable race rockers, I can sell you some low mileage ones I have because I will not re use them. I dropped an exhaust valve and although there was no signs of loss of valve control I have see far less issues with stock rockers with bearing upgrades so I will be going backwards as well as using inconel valves this time. That engine and the new one, both north of 1000hp.

The stock rockers have proven to be really reliable.

 

I will have to look into it and do some research. Curious on the price of those rockers you have

 

Well this car is street only but won't be driven much or too far . I'd love big cubes. But I don't want the thing to burn up or crack the block. I read the post on the lsx 454 with a cracked cylinder wall and got scared off from bigger cubes. But if there is a way to do reliably I really want to know. I do want to run GMs lsx block. I'm not sure on which turbos. (This is my first turbo build but far from a first timer with cars.) I'm going to be making my own headers and cold side tubing. Just unsure of the block/head/turbo combo needed to make the biggest safest hp. Not the money isn't an issue (it always is) but I will wait to buy something if I want the best .

 

has there been any issues with boosting an lsx 427?

 

Nope.. id go 434/440 if your going to go big engine big boost though. Just make sure you spend money on the bottom end. Dont cheap out.

 

this is the build sheet i have so far from one company.. let me know if there is something out of place .

Balance & blueprint Balance, Blueprint & Assemble Shortblock: fully deburr block, line
hone block w/ ARP main studs, deck block to desired deck height
w/ BHJ deck true fixture, bore block on 3 axis CNC, hone block w/
torque plates, balance crankshaft to 1/4 oz. in. tolerance, hang
pistons on rods, check bearing clearances, file fit rings, assemble
shortblock

LSX std. deck GM Bow Tie LSX race block. Features: priority main oiling, billet
main caps, increased cylinder wall & deck thickness, 6 bolts per
cylinder(for added improved head gasket sealing. Block comes
w/cam plate, rear cover, all plugs & dowel pins

Callies D/S 4.0 Callies Dragon Slayer 4340 forged 4.0" stroke crankshaft
w/w/Indexed & Trued Journals

Callies Ultra H 6.125 Callies Ultra Billet 6.125" H beam rods w/ARP ULTRA 7/16" bolts
(good to 1400 RWHP turbo applications)

Wiseco shelf Wiseco Custom Forged Turbo Duty Pistons w/tool steel wrist pins
& anti friction coating on skirts: Includes stainless chrome top ring
(for high heat applications, napier 2nd(improved oil controle), 3mm
oil rings(reduced friction & improved oil controle)

Pins Upgraded Tool Steel Wrist Pins .210" Wall Thickness
Pistons Gas Port Pistons

 

Sounds good, I would run the Ultra I beams or Oliver rods though personally. Pistons and supplied rings are fine, just make sure to order them with the correct dish to get your compression where you want it. You need to figure out what heads you want to use.

 

he said -22n dish pistons will give me 9.5:1 with 69cc chamber. i was looking into brodix heads but not sure what set up wit them

 

Looks good!!!!!!