Good evening, I’m new to the forum. I’m building a Wrangler stroker engine using a 4.0L block, 4.0L connecting rods, and a 4.2L crankshaft. For the valvetrain, I installed a Comp Cams 68-401-5 camshaft, Comp Cams valve springs, and Scorpion 1.7 rocker arms (the standard ones, not the adjustable type).
My question is: has anyone used this same camshaft and rocker arm setup and can tell me what pushrod length I’ll need?
push rods calculation
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Dimitris Siou
- Posts: 1
- Joined: August 31st, 2026, 2:55 pm
- Stroker Displacement: 4.7
- Vehicle Year: 2002
- Vehicle Make: Jeep
- Vehicle Model: Wrangler
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Russ Pottenger
- Strong Poster
- Posts: 937
- Joined: August 15th, 2009, 1:27 am
- Stroker Displacement: 4.7
- Vehicle Year: 2000
- Vehicle Make: Jeep
- Vehicle Model: Cherokee
Re: push rods calculation
Your camshaft or rockers should not affect the pushrod length rather than how much you surfaced if any of the deck of the block and head surface.
The stock nominal length pushrod should be around 9.625 and should shoot for about .040 to .080 lifter preload.
Aftermarket pushrods should you need them are typically sold in .050 increments.
The stock nominal length pushrod should be around 9.625 and should shoot for about .040 to .080 lifter preload.
Aftermarket pushrods should you need them are typically sold in .050 increments.