mcollinstn

I think he needs all the cc it presently has. He is running 10.5:1 pistons.

jw454

I will definately try that trick for cc,ing the heads. Do you think the Lunati cam is a better choice because it has less duration (less chance of reversion), or another reason? Im the type that will install the one cam and allways wonder if the other would have worked better. JW454.

formula31

There can be lots of arguments on cam choices. My choices are based on safety (reversion)with my silent choice exhaust (Gil magnum choice) and fuel (89 octane only). That limits my compression and as such, my cam options. Ive always believed that high compression and lots of overlap are not necessary and may even be counterproductive in a marine engine. Lots of lift, yes, and thats why a roller cam does so much better, it can give you the lift and airflow without needing excessive duration. But, the valve lift muct be proper for the heads and the airflow. .550 is about it for the large oval port heads unless they get worked over real good. Ive also believed that the difference in a few points from one cam to another doesnt show much in a boat so I try and lean on the conservative side.

In a nutshell, Big cam without big compression and big heads (and exhaust) doesnt work. And big compression means racing fuel and lots of maintenance. For what you want to do, you will be much happier with smaller cam. I run the Edelbrock torker 2 cam on my 454's. Could i make more power, sure, but for what I want to do, they are perfect.

formula31

Oh, and I do run the 2399 pistons. I think Crazy choice is better for power but Im chicken with the crap fuel I have available.

Crazyhorse

I'll build them with the L2465F (with approx. 119cc heads) but the owners get told what's gonna happen if they don't run quality fuel.
Plexiglass can be used instead of real glass if you wish.
By the way, Formula31 has been around the inside of big-blocks for a while and I've never seen him give bad advice yet. He's ok for a cruiser guy.

jw454

Im going to try that Lunati cam, hope it KICKS. With 2465 pistons, what will comp. ratio be with 119s. (Still have to cc the heads) Formula31, do you think lunati will hit harder out of the hole than stock .271in .282ex @cam lobe, (not shure of duration). Stock cam felt very mild. Even 454 MAG cam .300 in-ex @ cam seems mild. Still need carb ideas. Do you think large ovals will make good improvement over peanut heads.

jw454

I was intrgued, to come across the 330-454 build up you guys had posted at one time. I found it very helpful and very discouraging. Formula31, that Torker2 cam that you like to run isnt far off from Performer RPM. what else do you run in your 454? And how does it run? I also saw where JAY13 had a lousy time with his. Have you done any mods JAY to rectify your dissatisfaction with the project? Im about the same build (still havent decided on cam) Edelbrock rpm , high lift but long duration or Lunati 30218 .540-.550 [email protected] Want to crank high rpm horsepower, but dont want to be dog out of the hole. JW454.

formula31

The guy that built Jays engines the first time around didnt know what he was doing for marine. From what I understand, he used the large oval port heads as they were. I never heard the whole resolution to his engine problems. They do need the larger valves installed, hardened seats on the exhaust, and bowl work at least. There is another old thread about 454's on steroids but I cant remember the actual name. Put your money in the block, bottom end and valve train.

Crazyhorse

Dyno did a thread a while back about 330's on steroids. He started out with 330 Mercs and added Merlin oval-port heads w/2.19 intakes/1.88 exhaust, H693CP+30 hypereutectic pistons, E233K+30 rings, resized 330 rods, ARP 3/8 rod bolts, cast cranks turned -.010, CS1140R camshafts(.563/.578, 234/[email protected], 112 degrees lobe c/l) with HT817 lifters, 1404M cam bearings, 3190CP-10 rod bearings, 4400M-10 mains bearings, Cloyes Tru-roller timing chains, FelPro gaskets, Performer RPM intakes with 800 Holley carbs. Blocks were align-honed, decked parallel to the crank bores and zero piston height, bored and honed with torque plates. These are all Federal Mogul part numbers. SuperV's engines are identical except for L2465+30 forged pistons. Waterfoul's engine is the same except for H426CP+30 pistons, GM rectangle-port heads and a CS1139R camshaft. BGIII's engine was identical to Waterfoul's with the exception of an Ultradyne cam he bought from KAAMA.

jw454

That cam is very close to Edelbrock RPM specs. Do you know if he had good luck with it? Cam supposedly has power-band of 1500-6500. Sounds like too broad of a powerband to be true. Also peaks 1700rpms from my desired limit of 4800. Lunati 30218 is 2000-5500. What cam will (if either) do you think will get me out of the hole stronger. Also I will be running Revolution Marine exhaust system. I did not hear of any exhaust on Jay 13 engine. Still love to see sight of 330s on roids.