As I confessed, mine is just a layman's guess. I don't have definitive cam specs. But it is somewhat more aggressive. Can't be radical since it idles and runs so smoothly. I can say that the power from this engine compared to the previous 300 HP Crusader is immeasurable. Whether it has 360 or...
Thanks, Scott. Happy to learn about the 140º temp. Engine is 1987-vintage marine 5.7 rated at a dynoed 373 HP from manufacturer. The Vortec heads have been massaged and a higher lift non-marine roller cam swap, a marine Edlebrock intake and 670 CFM (Holley) carb and custom exhaust (sounds...
Thank you, Lou. Makes sense. I did find the temp at the intake manifold above and below the sender and thermostate housing to be consistent with the 128º to 145º range. Actually, the sender screws into the side of the new Mercruiser housing itself, and not into the intake manifold where it...
New 350 Chevy engine with about 400 HP. Running terrific but water temps seem to be too hot. Gauge reading 190º at, say, 3500 rpms. However with my hand-held LED thermometer I get readings of 125º-145º taken from the thermostat housing, the manifold, the engine block and the risers. Thermostat...
Chris, you're the best. I forwarded your letter to the seasoned mechanic who's helping me straighten this out (a 45-year friend). He fully agrees with you. He had showed me the same diagram you attached and he concluded the current setup might have been okay for the original Crusader engine but...
Hello, Chris! Your input is SO very much valued, and I'm positive that 98% of your advice and observations are spot on, but this situation is falling into the 2% range. The Holley-made carb is marine with the correct Holley marine carb return tubes, it is an expensive all-metal flame arrestor...
Subject: my fresh marine Chevy 350/375hp in the 1977 Aquasport 222 Osprey. Raw water cooled engine is running great, but temps are in the 110° to 130° and it takes forever to warm up. 140° thermostat. It will get up to 140 on the gauge at, say, 4000 rpms, but in my mind not fast enough. I think...
I managed to cross-thread the Quadra Jet male-threaded fuel intake fitting. Of course it leaks. The brass fitting male threads look good, the carb female threads not so much. If I tap out the intake housing, I assume the male fitting will no longer fit properly (?). I'm not sure if it is a...
You all know the carb size formula for a basic engine: CID x RPM, divided by 3456. In my case; 350 x 5000 / 3456 = 506. My engine is a refirb Gen 1 with vortec heads and roller cam, rated by Summit to be 373 HP. So adding 50 or so volumn points for the mild added grunt, I figured 506+50=556. I...
ALL of you trusted boaters just saved me over a thousand dollars, 40 hours of hauling and stress!! I found the Uship trucker group and they will come to my business in Venice, load it up and boogie it to San Antonio for $900! I can't thank you enough for your wisdom and advice. I'll be back ...!
