I'm confused as to what makes up a High Output vs a Base 3.0L. It's my understanding that both are the same HP? If this is the case, is it fuel economy at the same HP or just name sake ..etc?? Anyway, On the High output I find electronic ignition and small port heads and on the older base 3.0L, points/condenser and large port heads. Both have 2brl carbs, High output comes with Holly and base 3.0L has Rochester. Which head has the advantage, if any? Are the smaller ports making use of the hotter ignition and timing that the electronic ignition provide? Basiclly I'm asking for specs and details as to what constitutes each. Below is what I'm dealing with just to probvide some perspective in all this.....
Got the boat cheap with a cracked block, yes same old story, previous owner didn't know you have to winterize an inboard. I welded the first top crack with no problem then found the second at the bottom. At that point, (add some language) decided not to take a chance on finding a third. Found the 2006 Penta for $200. It was traded in on a new motor because the guy flooded it somehow.(water).. the real story will never be known because i'm sure it involves some real stupidity somewhere, anyway his loss, my gain. He kept some of the parts to fit his new long block and I started the clean up and rebuild. Short of the long bottom end is back together and I'm to the top end..
1989 OMC 3.0L that is being replaced with a 2006 Volvo Penta 3.0 HO, but having to use some parts from the older base 3.0L motor to get it together, ie. manifold, carb. I have the flywheel and coupler issue being resolved thanks to the advice I got the other day from here....Thanks guys! Helps to bounce things for a new perspective. The big issue at this point is port to port size between the manifold and head. Thought I had it figured out as to what I wanted to do, then decided to post for some advice. The manifold from the older motor has large ports and the newer head has the smaller. This causes a problem as I need to use the old manifold and carb. (Both heads are in good shape and within spec). If I use the older head, my manifold matches up and all is good unless there is going to be some kind of power loss based on diffrences between the two motors I don't understand. If I use the newer head, the manifold ports don't match and I have to get an adapter kit, which I have located for $155. What I really need to know is if there would be a power loss going to the older large port head and manifold (how/why, if so). As far as I can tell, the heads seem to be the same. Granted I'm not taking into account any possible volume and flow diffrences with this statement. I'm hoping someone would be able to shed some light on these issues. Sorry for the novel......
Got the boat cheap with a cracked block, yes same old story, previous owner didn't know you have to winterize an inboard. I welded the first top crack with no problem then found the second at the bottom. At that point, (add some language) decided not to take a chance on finding a third. Found the 2006 Penta for $200. It was traded in on a new motor because the guy flooded it somehow.(water).. the real story will never be known because i'm sure it involves some real stupidity somewhere, anyway his loss, my gain. He kept some of the parts to fit his new long block and I started the clean up and rebuild. Short of the long bottom end is back together and I'm to the top end..
1989 OMC 3.0L that is being replaced with a 2006 Volvo Penta 3.0 HO, but having to use some parts from the older base 3.0L motor to get it together, ie. manifold, carb. I have the flywheel and coupler issue being resolved thanks to the advice I got the other day from here....Thanks guys! Helps to bounce things for a new perspective. The big issue at this point is port to port size between the manifold and head. Thought I had it figured out as to what I wanted to do, then decided to post for some advice. The manifold from the older motor has large ports and the newer head has the smaller. This causes a problem as I need to use the old manifold and carb. (Both heads are in good shape and within spec). If I use the older head, my manifold matches up and all is good unless there is going to be some kind of power loss based on diffrences between the two motors I don't understand. If I use the newer head, the manifold ports don't match and I have to get an adapter kit, which I have located for $155. What I really need to know is if there would be a power loss going to the older large port head and manifold (how/why, if so). As far as I can tell, the heads seem to be the same. Granted I'm not taking into account any possible volume and flow diffrences with this statement. I'm hoping someone would be able to shed some light on these issues. Sorry for the novel......