TobyZ28

I know Camaro LT1's had the 2 bolt main and the Corvettes had the 4's. What the hell is a main? Anyone able to give me some good links so i can understand what a 2 bolt main is as compared to a 4 bolt main?

METALBEAST

iTrader: (1)

The mains are the caps that cover the crank bearings. The number of bolts that holds the end cap mains is 2 for a 2 bolt main and 4 for a 4 bolt main.

KJ

iTrader: (1)

When you pull the pan you will see the main caps holding the crank in place. A two bolt block will have a blot on each side of the cap, and a four bolt will have two on each side. We like to use the two bolt main blocks so we can install a splayed 4 bolt cap. On a splayed cap, the inside bolt goes straight down, and the out side bolt is at an angle. Makes for a much stronger piece.

wickedwarlock

iTrader: (4)

wow, learn something new everyday. I never heard of the splayed cap. Sounds interesting. I would love to see some pictures of that.

KJ

iTrader: (1)

go to Milodons web site they should have some pics.

www.milodon.com

SSmoky01

In my opinion, a two bolt main ain't any stronger than a four bolt main if it ain't splayed. That makes a huge difference!!!

slp223

iTrader: (1)

a two bolt main is not supposed to be stronger then a four bolt. I have my studded my 2 bolt dont know how it compares to a 4 bolt but has held together for me.

Villain70

Actually a two bolt block is stronger than a four bolt block becuase it has less drilling into the main webbing of the block. The fasteners really are the limiting factor in strength. I prefer two bolts with high quality main studs. Never had one fail, (yet).

gator's 99TA

iTrader: (2)

we are going 600 rwhp through an automatic on a 2 bolt main. just use nice strong ARP fasteners.

TwoFast4Lv

iTrader: (8)

My biggest concern is not how many bolts hold the caps on...but the cast iron caps

I am in the prosess of converting mine to four bolt mains but only for the stronger caps. Then again I am rocking the bottom of the block to

Probably not going to make as much as John here. the plan is for 550 and then a 200 shot.

I just want the bottom end to hold together and the head gaskets to be the relief valve

SSmoky01

We, who is we john? You know you have a 6 bolt main in that ls right. I guess that is real weak compared to a two bolt. No I am not gonna get smart ***. Your ls block is actually shaped different than ours so I ain't gonna talk crap. I wonder why drag cars and nascar cars run 4 bolt splayed?

TonyJ

SSmoky01

That is biatchin!!! I bet you keep pushing and you will be in the 10 sec club.

gator's 99TA

iTrader: (2)

ok shut your mouth before you look more stupid that you already have accomplished. "WE" is my family. not the LS1 motor that happens to be in my sig. here ya go. Alan Futral just put his majik tuning this sucker. you sir sound like you have a chip on your shoulder. i never said anything about what motor being superior to another. my "almighty" ls1 has dynoed a whole 381 rwhp LOCKED lol.



so yea, i am pretty damn sure this is a 2 bolt main LT1 bro. my hands put it together. long story short. 383 all forged Lunati motor, canfield head, cam motion/FMS cam, FMS tuned, 13 psi S- trim aftercooled, 100 nos wet shot, blah blah blah. since this is an LS1 mainly site i only put a pic of the LS1 in my sig. so yea, go home.

SSmoky01

Nice build. Just one question. Which is a stronger set-up, 4 bolt main splayed, even though you might not need them, or a 2 bolt main? I understand that there is more meat on the bottom end of the block but I always thought the 4 bolt splayed was stronger. Was I wrong???

dhdenney

iTrader: (53)

For all that goes, you don't need the splayed unless you are making crazy horsepower. My 2 bolt is together and I laid down 561 rwtq through it.

wickedwarlock

iTrader: (4)

he's pretty much there with the altitude he's at. According to NHRA adjustments. That puts him about 11.01 @ 129.92mph with correction.

http://www.nhra.com/tech_specs/altitude.html

that's 10s for sure in the rear world (track). Those calculators are always off.

He's already there. Just seen noticed this.

NOTE: Supercharged and/or turbocharged cars (i.e.: AA/A, AA/AT, BB/A, BB/AT, A/PM and AA/PM) use half factor; TA/D and TA/FC cars are not factored.