S&S 550C Cam compatibility with SE CNC Ported Cylinder Heads

Started by francodipa, January 23, 2021, 12:23:40 AM

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francodipa

Does anyone know if a Screamin' Eagle Milwaukee-Eight Engine CNC Ported Cylinder Heads with Performance Valve Springs (part of a SE Stage IV #92500073 with SE8-515 Cam) will support S&S 550C cam without having to change Valve Springs?

rigidthumper

From their instructions "This kit will work with lifts up to 13.75 mm (0.540 in) and up to 6500 rpm", and still have the recommended .060" clearance.
Are you safe with .010" less clearance? You still have to check V-V and V-P, so measure twice, as they say...
Ignorance is bliss, and accuracy expensive. How much of either can you afford?

Don D

January 23, 2021, 07:40:39 AM #2 Last Edit: January 23, 2021, 07:46:06 AM by HD Street Performance
Yes, just went through that with another cam that had some substantial TDC lifts, fixed
The S&S 550 has some huge exhaust TDC numbers, .232 & .264" with 273 and 278 exhaust duration,  :wink:

francodipa


scotman623

Those exhaust numbers are what give the 550 such a wonderful H-D lope sound..
Always look forward...

Don D

You bet and potentiality send torque right out those pipes

francodipa

It is an S&S 128" Power Pack for a 2018 FXFBS. As soon as I'll have finished installing and tuning I will post the dyno numbers and impressions