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2 bolt main to 4 bolt main

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Old 09-18-2001, 09:37 PM
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2 bolt main to 4 bolt main

recently, well a while back, i was dumb of buying a 350 2 bolt main from the salvage. It has flat tappet cam, and the rest. It came from a '92 Chevy truck. I was really stupid because there was a 4 bolt main 350 for less in the shop, 2 weeks later and not knowing.

Now I have a 2 bolt main block in my garage.

I have a crazy idea that a 2 bolt main can be converted to a 4 bolt main. If i am true than how is it possible?
Old 09-18-2001, 09:55 PM
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Manuel,

Yes, you can convert to a four-bolt main on the three center caps. Aftermarket cap kits are available. You'll have to drill and tap the outer bolt holes. You'll also have to mill the caps to the correct depth, and align bore the case after the caps are installed.

The kits are available for a couple hundred bucks.

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Old 09-18-2001, 09:59 PM
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Thanks Vader!!
Old 09-18-2001, 10:06 PM
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wait wait.. Vader, does Summit have any conversion kits? if not any one else that i can get one from? How much am I running?
Old 09-18-2001, 10:06 PM
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Car: 1989 C4
Engine: L98
Transmission: 700r4
Axle/Gears: 307
Yes, you could do that but its not worth the effort. 6 extra bolts dont give you any hp and in 90% of the applications 4 bolt main blocks are unnessasary. There are sevral aftermarket 2 bolt main caps that are stronger than the 4bolt caps on a 350 and alot easyer to install than drilling and taping 6 holes.
SSC


You can order all the parts from summit for either.

[This message has been edited by SSC (edited September 18, 2001).]
Old 09-18-2001, 10:15 PM
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SSC:
any recommendations if i decide not to the conversion.... any places that i can get those aftermarket caps that are stronger? well, because the block has plans on having a stroke.

Any companies that yall recoomend would be very nice,includeing parts. Thanks.
Old 09-18-2001, 10:37 PM
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Car: 1989 C4
Engine: L98
Transmission: 700r4
Axle/Gears: 307
<font face="Verdana, Arial" size="2">Originally posted by manuel:
SSC:
any recommendations if i decide not to the conversion.... any places that i can get those aftermarket caps that are stronger? well, because the block has plans on having a stroke.

Any companies that yall recoomend would be very nice,includeing parts. Thanks.
</font>
There are many people here running 2 bolt 383's so that tells you they can take some abuse. As far as the part number the summit catalog I have here doesent have the 2 bolt caps for a 350 in it, but they are made by "Milodon" and I have seen them before at speed shops so im sure that summit or jegs has them. You could also talk to that machine shop that has the other block, machine shops have sources for alot of specilty goodies that we dont have access to.
Good luck SSC

Oh the price im seeing in summit is 200$ so that gives you a ballpark figure.
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