gas is mixed with air further in the plenum, the only thing that is may due is make it leaner at wot which may be good because they are on the rich side to start with (more air and closer to the perfect mix = HP)
I actually had plans to rebuild the 454 at the end of the season, new heads cam etc., but I came across a GREAT deal on a complete 502 MPI I could not pass it up,,, it needs refrshed (450 hours ) but it runs so I through it in for this season,, I will keep the 454 on a stand just in case this lets loose during the summer as a backup.
Yes, let me know how things worked out. I have a 7.4l (1999). I put a K&N on it. Cleaned up the transom alot and you get a little more mid range "umpf". I have a small boat 99 Hammer so maybee that is why.
jimgoog,,, what plugs are you running,,, I switched to Rapid fire #1,,, between that and the K and N, my transom was pretty clean,,,,, now that 502 is still terrible with both installed so I get to try again !!!
Don't really know. I gues the OEM replacements. I do mix in PRI-G with my fuel though. The PRI-D works great iny F-350. Seems to run great in the boat too.
check it out , http://www.priproducts.com/Home.htm
CR, mine is a 99 Hammer, 23 pitch mirage plus. I run full tank of fuel and 4 people loaded with gear 66 on my gps and more around 74 on the speedo. I got my filter from Rex Marine, www.rexmar.com(Great service dept, tech was really helpfull) . I don't remeber the exact price, but it was cheaper than buying it straight from [email protected] It goes on in about 5 min. Well worth it from a looks stand point. It got about 200 more rpm out of it. For me lab finishing will be next.
well I trimmed the gasket and ran it in the driveway with no problems, so the only thing it should do is lean it out. Im hoping to do a test run this weekend to read the plugs if anyone want to go for a ride let me know the wife says its still to cold
well I took the boat out on sunday for the first time this year and after trimming the gasket, I had the wife and kids with me so I couldnt take her over 3000 rpms but with a day of running the gasket trimming doesnt seem to hurt, the transom does not show any signs of running rich. I still have to go out and run WOT and check the plugs and my MPH