Senior Tech Team
Join Date: Mar 2002
Location: Westminster, MD
Well, for one thing, the larger bore unshrouds the valves...which is good for airflow.
The down sides I see...
502 has no provisions for a mechanical fuel pump
502 requires an adapter & machining to run a two piece seal crankshaft...more $$$ to convert
502 has an oddball timing cover which means your stuck with a stock style timing chain, or special machining to accept a mkIV double roller chain cover
Personally, my ideal street/strip engine would be a 509 which is a 4" stroke with a 4.500" bore...kinda like a big bore 454.
The short stroke is entirely up to you and is dependant on your intended usage. There are many ways to skin a cat...each has their pros & cons.
- What weight vehicle will this be used in?
- What rpm range (redline) are you looking to stick to?
- How will the car be used, and what percentage of each assuming street/strip?
- how much compression & cam?
- what trans?
- what converter?
- what rear gear?
- what tire size & type?
- any specific race class, or just for pleasure/T&T use?
- will power adders be used?
Many, many things need to be taken into consideration to make a balanced package. A matched combination is much more important than one part such as crank stroke, rod length, cam choice, or head choice. None of these matter a hill of beans if the combination is mismatched.