B18CYA

iTrader: (17)

This seems to be pretty common in high hp and fi app so I hope I'm in the right forum?

At what power level is it recommended?

I have had my mains machined already. Is it to late?

Could anyone shed some light on this procedure?

Fireball

iTrader: (21)

anything over 800 hp and I'd considering them. I think it has to be done before a line hone incase anything moves...

I know my block had the mains moving a considerable amount at 1200 RWHP

NA$TY-TA

iTrader: (21)

Mine moved also with an Iron Block..... Pinned this time.....

hellbents10

iTrader: (10)

We recommend this at 900fwhp and up.

$ho_tyme

iTrader: (3)

Also interested in this,any picks,write up on it. I plan on running iron 6.0 short filled and anything else that could help it I will do. Sure my engine builder knows what it is,but can someone give us guy that dont know some insite.

Shawn @ VA Speed

iTrader: (3)

here are a couple pics of pinned mains i have done,anything 1000hp or more should have them pinned,but it's a good addition at any hp level

$ho_tyme

iTrader: (3)

Thanks Shawn, so essentially you are dowl pining the mains.

HUNTER02SS

iTrader: (24)

It is highly recommended to keep the caps from walking around.

Beaflag VonRathburg

iTrader: (176)

It's on my list of to dos amongst a couple other things. Thanks for the pictures.

crashly

looking good shawn..
i was actually thinking of something simular,
in the heavy diesel world, they have the 'sleeves' or dowels . that are hollow , and the bolt hole is inside the dowel
you know what i mean?

for the 7/16 sbc main stud, the sleeve is say 5/8 , and hollow, and the stud thread is inside the sleeve / dowel

how would this work ??

ash

Shawn @ VA Speed

iTrader: (3)

the hollow sleeve doesnt seem to work as well as the solid pin,i believe the thin wall tube allows a little flex,the ls7 and lsx blocks both have the sleeves and you still see cap walk.most of the aftermarket sbc and bbc stuff has a solid pin.

$ho_tyme

iTrader: (3)

This may sound dumb,but how are they drilled?Is it with the caps on? I know you said the mains may get recut but with it be a machine fit and no room for error. Sorry I'm not a machinest and the procedure info would be great.
Thanks again

Jditlfm

iTrader: (26)

Anyone have a pic of cap walk. I would really like to know what it looks like. Thanks

396375

iTrader: (10)

It's a long runway were models show off new fashion cloths

Jimmy P

iTrader: (177)

I have Katech billet main caps that are pinned. I asked around a few of the reputable LS1 engine builders, and most of them recommended them for my setup. Katech had them at a great price.

Fireball

iTrader: (21)

shawn cuts them on a cnc

B18CYA

iTrader: (17)

Sounds like the way to go.. My builder said the stock caps are very pooris and brittle. I guess you can push water/air right threw them with some air.

Thanks for all the info

Shawn @ VA Speed

iTrader: (3)

yes,i machine the hole in the block and caps with the cnc,accuracy really needs to be greater than .001,you could probably do it in a std mill but it would be very time consuming.i'll post some pics later

as far as the caps being porous and brittle,they are much better than cast iron,i dont think you will be able to push air or water through them,they are actually a very strong piece,Brian's motor made 1400+ on stock caps with no issues other than cap walk.

DAVESS02

iTrader: (30)

Will a main girdle resolve this issue?

sevanseriesta

iTrader: (34)

how much is it to pin a block....