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Author Topic:   2 bolt mains
Dirt Freak

Total posts: 268
posted April 02, 2005 09:40 PM  
I have a 69 2 bolt main block, 350 #3932386. What kind of horspower can this block handle weekly. I'd lioke to turn this thing 7000 and build a 383,10 to 1,64 cc head. Should I try to find a different block. I have 2 others but they have passanger side dip stick and my oil pan is for a driver side.

Dirt Freak

Total posts: 205
posted April 03, 2005 08:35 AM  
Take the 3 center caps and fling them to the weeds. Then buy a set of splayed main caps and have your shop drill and tap for the extra holes since they will be line boring them anyway. then have the water holes in the deck tapped to 3/4" npt and install the deck plugs. After ya do that get a good assembly and balance it and it'll live forever.sorta forever...

Dirt Maniac

Total posts: 170
posted April 03, 2005 10:08 AM  
oil pans are cheap .....get one for the right side dip stick.

unregistered Total posts: 170
posted April 03, 2005 10:22 AM           send a private message to JT54   Edit/Delete Message   Reply w/QuoteBBBBBB
Your 2 bolt will be fine.

Ive had up to 14.5-1 388 in a 2 bolt block with main studs.

If I get any 4 bolts I sell them for enough to buy 2 more and see if they are 2 bolts.

Dirt Forum Champ
Total posts: 501
posted April 04, 2005 06:02 AM  
I agree with istock66. For extra insurance, put a set of ARP main studs in the bottom end and have the machineshop align-hone it afterward.

Dirt Freak

Total posts: 268
posted April 04, 2005 06:35 PM  
This may be a dumb question, but why do you need to alighn-hone the mains if all you are doing is putting studs in?

Dirt Freak

Total posts: 268
posted April 05, 2005 08:56 PM  

unregistered Total posts: 268
posted April 05, 2005 09:56 PM           send a private message to eaton89   Edit/Delete Message   Reply w/QuoteBBBBBB
they say when you change fasteners you should align hone.

I dont do it, I wont use a block that has a main line that needs honing ever again. I have had nothing but bad luck with machine shops line honing or even line boring a block.

One of the better and much cheaper machine shops I used in the past told me to just toss blocks with a bad main line. It costs more to line hone or bore than to get another block from u pull it so thats what I do now..

Ive used studs and its worked out fine. Main reason I use them is to secure a windage screen, I dont run over 6500.

Dirt Freak

Total posts: 268
posted April 06, 2005 08:54 PM  
Thanks for the advice and the help!!

Dirt Forum Champ
Total posts: 578
posted April 07, 2005 10:56 AM  
studs pull differently on the main caps..thus changing the bore slightly. they also pull on the main webs differently so its best to install studs BEFORE boring and honing the block.


Dirt Full Roller

Total posts: 43
posted April 11, 2005 05:56 PM  
the 2 bolt will handle all you want it to. but I would change gears. a 383 has a low torque range and has better power at 6000 to 6400

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