Q: I’m planning a Mopar 440 to 500ci stroker build. One thing I have had trouble picking out is the camshaft. The engine will be going in my 1970 Challenger that I want to be streetable but with a healthy lope. I’m looking at a hydraulic roller so I can have the largest usable rpm range. How does the larger displacement affect the behavior of the cam? If the cam is listed to have an rpm range of 2,200 to 6,000 rpm for a 440, will that change for a stroker? Should I be shooting for more duration or lift to accommodate the extra displacement? When do you pick higher ratio rockers versus just getting a cam with more lift? For background, I plan to use Trick Flow heads and an Edelbrock Performer RPM intake manifold with a Holley Sniper EFI system. This will be my first engine build, and I will be buying the stroker short-block from an engine builder.
HOLMES’ 505CI CHRYSLER ADDITIONAL INFORMATION
Direct conversation with Mr. Holmes returned this additional information.
Short-Block
Muscle Motors Racing short-block
Displacement
505.3ci
Bore x Stroke
4.35” bore x 4.25” stroke
Connecting Rod
7.100” center-to-center
Rod/Stroke Ratio
1.67:1
Cylinder Heads
Trick Flow Specialties PowerPort 240
Combustion Chamber
78cc
Valve Sizes
2.190” intake/1.760” exhaust
Peak Flow @ 0.700 Lift
334 cfm intake/262 cfm exhaust
Compression Ratio
This story is from the December 2020 edition of Hot Rod.
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This story is from the December 2020 edition of Hot Rod.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.
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