94 454 pickup engine rocker type? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-20-2005, 11:19 PM
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94 454 pickup engine rocker type?

Haven't messed with BBC's since my 67 396/375 Camaro.

Question on rockers arms.

Friend of mine has a 94 pickup with 454, and is
interested in installing higher lift rocker arms.

We can't find for sure what type rocker arms ithas
now - would it be the self aligning type?

He'd like to put on aftermarket ones that are
usually more accurate in ratio, and maybe the
ones with the roller tip.

Doesn't want to go hi buck, his engine seldom sees
the high side of 3500 or 4000.

The Comp & Crane roller tip rockers say the studs
have to be replaced with specific screw in studs.
Wouldn't that likely mean threading the holes in
the existing press-in (?) studs bosses?
They also require guide plates.

I thought there were self-aligning roller tip rockers
that would directly replace the factory ones?

Thanks for any help and part #'s!

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Old 06-21-2005, 05:49 AM
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What you have is Gen V stuff which is the non-adjustable type rocker config... The Gen V`s were very prone to valve train problems so pay close attention to what you do... Summit can most likely provide you with what you need... Here is a bit of info you might find useful...?

In 1991, the Mark V (later called Gen V) was released. This was offered in 454 and 502 CID versions through the 1995 model year. Some aftermarket engine builders marketed engines that they called “Gen V” but these were basically Mark IV. A “real” Mark V/Gen V engine has a one-piece rear main seal, uses flat-faced hydraulic lifters, and has non-adjustable net lash rocker arms (1.7:1 ratio), requiring different length pushrods than the Mark IV. The oil pan and front cover are also different than the Mark IV, as is the timing chain and gear set. A different water jacket configuration is employed. These engines were primarily designed for marine use and do not have a boss for a mechanical fuel pump, or provisions for clutch linkage. These engines use Mark IV cams and can also be fitted with the Mark IV timing set (check front cover clearance!). For moderate performance applications, the valve train can be easily converted to an adjustable configuration by using Crane Part No. 99152-16 Stud Conversion Kit with the stock pushrod guideplates. Crane aluminum rockers, Part No.’s 13744-16, 13750-16 or 13763TR-16 can then be installed, providing full adjustment with no machining needed.
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