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Since 1952

Main Bearing Spacers - Small Block Chevy, 350 Crank

SAME DAY SHIPPING! Order within the next 1 hour 32 minutes and receive same day shipping

Main Bearing Spacers - Small Block Chevy, 350 Crank
Main Bearing Spacers - Small Block Chevy, 350 Crank
Main Bearing Spacers - Small Block Chevy, 350 Crank
Main Bearing Spacers - Small Block Chevy, 350 Crank

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Please NOTE the following about this product:

  • This item is sold as a set.



Q & A

What's in the Box

Put a 350 crank in a 400 block.  Simply snap in and install regular 350 main bearings.  Reusable.

Spacer bearing makes up for difference in crank journal diameters.

Customer Reviews

Rated 5 out of 5 by 1 reviewers.
1 reviews
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chevy builder
Verified Purchaser
Rogersville Mo

Simple & Reliable

August 27, 2010
I use Speedway products building small block chevy race engines
  • Excelent product price
Yes, I recommend this product.
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Product Q&A

1 questions : 1 answers

1 answers

what is the thickness of these main bearing spacers?

las vegas nv
August 03, 2015

what is the thickness of these main bearing spacers?


August 04, 2015
The main bore of a 400 is 2.841" and the main bore of a 350 is 2.641". That means these spacers are .100" thick on each side to provide the .200" smaller ID bore size.
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Item Details

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Clevite H-Series 1969-Up Small Block Chevy Rod Bearings
(Part #757R663H)
                        Clevite's H-Series was developed primarily for use in NASCAR type racing, but  they are suitable for all types of competition engines. These sets are  specifically for 1969-Up 302-305-327-350 S/B Chevy "Large Journal" engine (with 2.100" rod  journals).
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  • H-Series bearings should be used if contact patterns obtained with P-series parts are too narrow. Contact pattern should ideally cover 2/3 to 3/4 of the bearing surface.
  • If you aren't sure which type of performance bearing to start with, the H-Series will be your best choice.
  • X001 has .001" extra bearing clearance

H-Series Features (Link)
Clevite P-Series 1955-69 Small Block Chevy Rod Bearings
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Not to be confused with standard "passenger" car bearings, Clevite's P-Series is their oldest line of premium high performance bearings. These sets are specifically for 265-283-302-327 S/B Chevy "small journal" engines built from 1955-1969 (with 2.00" rod journal).

  • Use P-Series rod bearings where extremely high RPM’s cause severe rod bore close-in.
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Green Plastigauge for Bearing Clearance, .001-.003 Inch
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