Deck height

From MoparWiki
Jump to: navigation, search

If you have information, corrections or reference links that could improve this Wiki, but are uncomfortable with editing in the markup language - you can click the Discussion Tab above and freehand type your information. An editor usually checks the discussion prior to editing the Wiki.

Deck Height is center of Crankshaft to the block's deck


Deck height is a vital engine measurement that dictates rod length, crankshaft stroke, piston-to-head clearance, and so much more. Deck height is simply the distance from the crank centerline to the deck surface of the block.

This really isn’t a critical dimension if a standard rebuild is the goal. But if you’re a performance engine builder and stroker cranks, longer rods, shaved decks, and custom pistons are your thing – then block deck height is an important dimension that demands attention.

Deck height dictates many engine dimensions. It limits stroke, rod length, and piston compression height. This last dimension is a critical part of the rotating assembly equation and is defined as the distance from the wrist pin centerline to the piston deck.

The proper way to deck a block involves using a mandrel placed in the crankshaft main webs to simulate the centerline of the crankshaft. Then measurements are taken from the outside diameter of the mandrel to the block deck surface at multiple positions. This establishes whether the deck is parallel to the crank centerline. Often, this is not the case.

Given inequities, simply leveling a block in a fixture and then milling the deck “flat” could in fact make a bad situation worse. A simple way to evaluate an engine’s deck alignment is to use the same piston to check piston-to-deck heights at the engine’s four corners and compare the numbers. If all the deck heights are within 0.002 to 0.003-inch, consider yourself lucky. This still leaves plenty of opportunity for the block to be “out of square” but at least it will be close.

Deck Heights of Mopar V8 Engines

Engine Family Deck Height in.
273-318- Poly 9.60
273-318-340-360 LA 9.60
Chrysler LA Race 9.56
361-383-400 B 9.98
413-426-440 RB 10.725
426 Hemi 10.725
5.7L- 6.4L Hemi 9.240

Random Page | Longest Wikis | Oldest Wikis | Newest Images | Newest Wikis | List of Categories | List of Every Freakin Wiki

Register to Edit
It takes less than 5 minutes to request registration for editing, and we try to approve within 24 hours. Click the Register Link in the Top Bar.
MoparWiki Help
While editing Wikis may at first glance appear a little overwhelming, it really isn't. You will find this site's HELP (link found in the sidebar) to be very strong and easy to understand. The best way to start is with small edits and working on your user page -- and you will become a Pro in no time.