This is for my buddys boat. It is a 95 7.4l (454) GEN V. It was carbureted and we put and Mercruiser EFI from a 94 502 in it. Long story short...

We are having the ECM for the EFI reflashed from Jim @ Arizona S&M he wants so info on the engine, and we have no idea what it is besides a 454. We were trying to at least get the lift specs of the cam. With the dial indicator on the retainer it only measured .380 lift, it has 1.7 roller rockers. So this would make the lobe lift .223-4

We did provide casting # of the heads and valve size. 14097088...91-up...rect...OPEN...Gen.V 454/502 HO, 118cc chamber 2.19/1.88 short of that no idea about compression.

I have not seem that small of a lift before. All of the BBC boats I have ever worked on are in the .5XX range and higher. Funny thing is this thing hauls butt and sounds like it has a .450-.500 lift cam. This thing is no slouch. It's a 21'er and with a 3 blade prop @ 24 pitch and will do 70MPH with 2 people in it.

I just find it hard to believe the cam is that small. Anyone with any info help me out.

Thanks in Advance,
Denis

So you took a 330 HP engine with cast internals and installed rectangular port heads and MPI setup from a Magnum engine? Hope the next guys that buys the boat know's its not a real Mag engine. Your compresion will be lower. You need to upgrade the oil cooler. The cams on the 330's are small, do a little research they have been posted several times.

Nice assumption... but no. The engine was built by an engine builder and has a steel crank, don't know the compression but has forged pistons, 4 bolt block and rectangular heads. It was carburated now it has EFI.

Why are you worried about the next guy. I don't know about you but my friend and I are reputible people and would disclose all information about the boat. He has a stack of records and reciepts, but nothing specific about the specifications.

He is the 2nd owner and it's a 95 Essex and it was a mag cover boat. It's a well known boat, but no one has specs on the engine it is a UA code block GEN V and not a Mercruiser there is no tag above the starter and there never was one. That info we got the other day. The compression is somewhere around 9.5 -10.0 We will be tearing into it when it comes back from the river. We were just trying to get an idea for a new flash. I have measured plenty of cam lift in all kinds of engines and gotten a rough idea I know I can't get duration without putting my degree wheel on. So we are just going to flash it for a 454 w/9.5 comp and a mild cam.

When its your first post and you give incomplete information thats what a lot of people will assume. You must have high dome pistons because that sounds like very high compresion for a stock 454. I have 8.9cr, 110cc heads, 489ci, flat top pistions. Maybe if you give more details and a complete history other people will chime in.

I can only give what I have when I have it.

I see, you really need to know what pistons you have to figure cr. He should probably install a cam compairable to the 454 mag. I do not have those specs handy but if you do a search you can find all the specs you need. Then you can use a know configuration for programing. If you go with a bigger performance cam he should use aftermarket exhaust with long risers.

IT SOUNDS LIKE TO ME THAT 454 YOU HAVE IS FOR A TOW APPLICATION FOR A TOW TRUCK SOME WERE DOWN THE LINE THE MOTOR WAS FOR A TOW TRUCK AND CONVERTED TO A MARINE MOTOR WITH THAT SIZE CAM WITCH THERES NOTHING WRONG WITH THAT. SO WHEN YOU DO YOUR RESEARCH MAKE SURE YOU CHECK INTO 454MOTORS THAT WERE BUILT FOR TOWING THE CAM THAT IS IN YOUR MOTOR IS A TOW HIGH TORQUE CAM JEGS AT JEGS.COM SALE THESE MOTORS OR YOU CAN CALL ERIC OVER AT TEAGUE CUSTOM MARINE 661 295 7000 AND TELL HIM ERIC FROM 310 EXPRESS SENT CHA. HAVE A NICE DAY GENTLEMEN AND HAPPY BOATING. I ALSO HAVE (2) 454 MAGNUM CARB MOTORS JUST REBUILT AND (2) BRAVO 1 OUT DRIVES WITH 24" PROPS FOR SALE FOR A BAD ECONOMY PRICE IF ANYONE IS LOOKING FOR A GOOD DEAL DROP ME A LINE ON OFFSHORE.COM OR CALL 310 213 7685 ERIC

Thanks for all the info. The engine was built for that boat specifically and installed by Essex brand new in 95. As for Teague we licv just a couple of miles form them and have spent thousands and thousands between friends.

I was possibly doing something wrong in my measurements, but I have done plenty in my day. I do remember there hydrolic lifters that pump up with oils PSI and RPM's we are going to try and measure the lift based on the case of the lifter. or just wait a couple of weeks and tear it all down and do it the right way.

B. Break
O. Out
A. Another
T. Thousand

Are all the cam lobes the same? I had a flat tappet cam the had a few lobes flatten out.

We measured the #1 exhaust and the #5 intake. It was a P.I.T.A. because or the big ole headers. The thing hauled a$$ with the 850 Holley!