looking for F4.6 (purple cooling head) info

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blown68ssrs

Active Member
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110
I recently bought an used F4.6 and installed it in a 25 that had a S-25 in it. Ran it tonight and I didn't noticed any significant performance increase. I thought the F4.6 is night and day comparing to the S-25.
I have two q's:
1) How much more output does the F4.6 comapring to the S-25
2) This motor will run for awhile and dies when I turn around after a WOT pass. 220F ish. It will fire right back up. It idles good and I set the LSN pretty lean. Haven't checked the fuel lines and caps yet.
Thanks in advance
 

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