6.0 iron block?? good idea or not?

[1bad99ss]

im thinking about running the 6.0 iron block in my 99 ss....just a stock block with a MTI X1 cam and comp 918 springs....it will have full exhaust plus a tune......has anyone done this swap??? or do you know someone that did the swap and is it a good idea??? cuz i can find the 6.0 iron block all day long for 500-1000 bucks.

[Mr. Luos]

I have the LQ9 block in my Trans Am.

Fits like the LS1 fits.
Weight is the disadvantage. 80 extra pounds.
They also heat up more. Aluminum dispurses heat better.

I wouldn't go iron block unless you are going to stroke it to make it a 402. If you go that far, might as well get .030 taken off and go 408.

[2000T/A Guru]

Or you can get a custom alum block, which I have found some in my area for under 1000. Bare block of course, and i have seen some of the high end ones handle 1400hp

[hec33]

The more you bore the block, the hotter it will run... I wouldn't go for the bigger motor because of weight unless you want to go for some really SERIOUS power!!! I think unless you get over 600 HP you shouldn't have to change anything except for maybe the rods and pistons

[67CamaroRSSS]

One of my friends uses a 6.0 block but he has a 4" stroke crank. His 402 puts 497hp thru the rear wheels on pump gas (91 octane here).

[Mr. Hyde]

I've heard it was a 80lb. differance between the two blocks as well....what's a lousy 80lb. when you're talking 3300lb.!!!! Take out the spare tire and jack, that's good for 20lb. easy. Buy a couple cases of Slim Fast...another 10lbs. Okay now for the last 50lb. Just run it at a 1/2 tank. Done! Next....

[2000T/A Guru]

Yeah dont go like that unless you making some serious power, with forged internals and all, if you are goin to jsut have a cam setup with a upgraded valve train making like 400-440rwhp the ls1 block with stock internals can handle that.

[67CamaroRSSS]

Yeah dont go like that unless you making some serious power, with forged internals and all, if you are goin to jsut have a cam setup with a upgraded valve train making like 400-440rwhp the ls1 block with stock internals can handle that.

Bigger bore diameter on the 6.0 block allows the valves to be unshrouded and will also allow larger diameter valve heads.

The problem with the extra 80 lbs is that it's over the front wheels. Not so good when looking at weight distribution but not that much of a problem unless your road racing.

[2000T/A Guru]

Yes but he said hes just want to do a cam setup,so he would have a 402 iron block making around 420rwhp, which a ls1 can hold but now he weighs 80 pounds more. Doesnt really make any sense unless of course you are planning to rebuild the engine for more hp down the line.

[Mr. Luos]

One of my friends uses a 6.0 block but he has a 4" stroke crank. His 402 puts 497hp thru the rear wheels on pump gas (91 octane here).

531.1 RWHP with mine. 91 octane as well.
Pretty mild set-up I think. 11:1 compression, average cam for that size motor, Patriot stage III heads, etc.

[67CamaroRSSS]

Maybe he's got plans for the future.

My buddy went with the 402 because he spun a rod bearing in the 346 and decided he wanted more cubes, forged bottom end, better heads, etc. He's at 497/502 N/A but he want's to add a 150 shot.

[Mr. Luos]

Maybe he's got plans for the future.

My buddy went with the 402 because he spun a rod bearing in the 346 and decided he wanted more cubes, forged bottom end, better heads, etc. He's at 497/502 N/A but he want's to add a 150 shot.

My original build plan involved a ProCharger.
Lost my job right in the middle of the build, so some things changed.

Still would like to throw a blower at mine in the future, but for now, I have to deal.
Already enough power to need a cage at sea level....fairly close on the mountain (Bandimere - 5800 feet).

[67CamaroRSSS]

531.1 RWHP with mine. 91 octane as well.
Pretty mild set-up I think. 11:1 compression, average cam for that size motor, Patriot stage III heads, etc.

The guy that did the tune did a "conservative" tune and did not tune for a max effort. I believe intially it went 515 or 520 thereabouts. I believe they took out some timing (and a few other things?) for the hot air we have here in Phoenix.

[2000T/A Guru]

Im gonan go with a 403 aluminum block 11to 1, custom heads and cam, i like have a 500rwhp good driving car. With a 200 or 300 shot lol for when i wanna get crazy

[Qwk94Z28]

i got my lq9 for 100 bucks it just needed the bores cleaned up from sitting but i planned on building a 408 anyways, so it worked out good

i'm going with the l92/l76 top end so i'm still doing alot of reading on a cam choice since not alot of people are saying what cam specs they have

hopen for 500whp at least

i see alot of you guys with 11:1 are on 91 octane could 12:1 be still ok on 94?

[dar54car]

are there any objections to building a 408 out of the LQ4 6.0 iron blocks and where are you coming up with all those LQ9 blocks

[Qwk94Z28]

are there any objections to building a 408 out of the LQ4 6.0 iron blocks and where are you coming up with all those LQ9 blocks

iirc the lq4 is just a lower outout 6.0 block, so if ur building a 408 it would be like the same thing