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140 B30 pushrods.

Does anyone know what is the difference between B30 and B18B pushrods and what advantage dose it give in the B18b/B20 rebuilding process. I have seen it stated in modified engine rebuilding specs but I am no wiser to the benefit. Also are the rockers also different?


  • Angus242164Angus (@Angus242164) Western Victoria
    I wasn't aware of any difference in the rocker arms or pushrods between the four cylinder engines and the B30, but checking parts catalogues for differences between part numbers would be the first step towards finding out.
  • The B18/B20 and B30 rockers are odd and even numbered, but they all the same part number pairs.

    The (standard) lifters are the same part numbers. (aside, years ago I had a set of the wizz-bang R-Sport lightweight ones in my original 144).

    The pushrods are different.

    418304 - pushrod B18/B20
    430121 - pushrod B30

    Never heard of it being done, maybe they're stronger?
  • I have since been in contact with Phil Singher in the U.S who wrote and article on the building of a high horsepower b20 some years ago called the MPPE in which he stated the use of the b30 push rods. He has since told me that the b30 push rods are slightly shorter and was given the advice to use them to correct the rocker geometry after decking the block by Mike Aaro from Sweden. Phil tells me that he has since sold that motor (MPPE) and built about another 35 or so motors since then but none comes to the hp the MPPE produced. He now uses good standard Volvo push rods with no complaints. The story of the build (MPPE) is on google and is a good read. I wrote to Phil after posting my comment so I do not wish to look like a smart arse answering my own comment and will check the measurement when I rebuild. Maybe someone will have both types of push rods and put the comment to bed.
  • When you get advice from Phil Singher and Mike Aaro about B20s, you're doing it right.

    I read the story of the MPPE too years ago, and it's time I read it again.

    Oddly enough, I do have both types of pushrods - trouble is, my B30 ones are still in a shed up on the mainland and have yet to cross Bass Straight for me.
  • Angus242164Angus (@Angus242164) Western Victoria
    I think I might have some loose B30 pushrods actually, all my B20 ones are inside engines though.
  • Having read about it somewhere, I used the B30 engine mounts under a B20 engine and it certainly made a difference to the stability of the engine.
  • I have just found some b 18/b 20 push rods and compared the length to the b 30 push rods. B 30 LENGTH 203 MM B 18/B 20 LENGTH 205 MM. 3 mm shorter in a b 30 motor so if you wished to deck your block of your b 20 for any reason you could keep the rocker geometry somewhat correct. The diameter of both push rods was the same. The length of the rods was only measured with an engineers ruler so do it with a vernier caliper before you machine and certainly do not take what I say as gospel.
  • The B30E pushrods are shorter and B30A ones are normal length. The shorter rod is for the thinner high compression head
  • Vee_QueVee_Que (@Vee_Que) South Eastern suburbs Melbourne.
    As a twist to this, if you go with chev lifters you need different length rods anyway so the point is moot. As per the ipd kit, the cam and head makes the bigger difference.
  • Vee_QueVee_Que (@Vee_Que) South Eastern suburbs Melbourne.
    People who have merely give the guy money and receive nothing.
  • People who can hit his workshop in person for parts have an OK run but anything remote you are just giving your money away

  • That's John Parker. He has a reputation as a thief, for taking money for parts that never get delivered.
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