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Cylinder heads
- Thread starter Catch 22
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PatriYacht
Charter Member
We really need more info about your combination. Engine size, Hp expectations etc.
Catch 22
New member
My combination is a 1998 454mpi mag with a procharger running 7lb of boost. Other then the procharger the engine is stock. It has stock heads now with good parts. Looking for a little hp gain and still keep it reliable. It's not a race boat but i would like it to run as good as it runs now. Thanks Jim
The Edelbrocks won't give you much better flow than the stock heads with your setup. You will pick up the benefits of the aluminum head's thermal transfer properties which will make your engine a bit more detonation-resistant. The ProFiler- they're more of a drag race head. The volumes are a bit big for your application.
The forced induction gets you past some of the intake port issues that are more important with N/A engines. A bigger concern though is getting good exhaust port flow. The intake is going to flow what it does but by compressing the charge, you're going to get more into the cylinder. You need to get it out. Most heads are built for N/A port flow ratios. With forced induction, you're going to want a head with a lower ratio of intake to exhaust volume. Dart and AFR have several offerings that would work for you.
The forced induction gets you past some of the intake port issues that are more important with N/A engines. A bigger concern though is getting good exhaust port flow. The intake is going to flow what it does but by compressing the charge, you're going to get more into the cylinder. You need to get it out. Most heads are built for N/A port flow ratios. With forced induction, you're going to want a head with a lower ratio of intake to exhaust volume. Dart and AFR have several offerings that would work for you.
MERPerformance
Sponsor
I have used Profiler, over the years since they came out. I have had excellent results with them. You can use the 320 since you are using boost. If I can help feel free to call.
Mark
Mark
Isn't their 320 an oval port head?
Chris & Catch 22
Profiler doesn't make a oval port head that I am aware of and their 24 degree head in a 320 cc intake port will outflow and perform better than almost any other 24 degree aluminum big block head out there. If these are Profilers new 24 degree 320 cc port heads, they will do a great job on that engine if set up right. If you are going to run them raw in salt or brackish water I would consider hard anodizing them before using on that engine.
Best Regards,
Ray @ Raylar
Profiler doesn't make a oval port head that I am aware of and their 24 degree head in a 320 cc intake port will outflow and perform better than almost any other 24 degree aluminum big block head out there. If these are Profilers new 24 degree 320 cc port heads, they will do a great job on that engine if set up right. If you are going to run them raw in salt or brackish water I would consider hard anodizing them before using on that engine.
Best Regards,
Ray @ Raylar
2112
Founding Member / Contributor
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Catch 22
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They will be run in salt, who does the hard anodizing, is the anodizing in the water jackets as well as the outside? That's why I was looking at dart and edelbrock also. Any other pro's/con's about running aluminum head's in salt.
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Catch 22
New member
Thanks. I have a 1998 Donzi 22 Classic, 454mpi mag M3 Pro Charger. It has Marine Machine full hydraulic steering, 280 K Planes, Stainless Marine Exhaust, 2 inch Imco Shorty.
We boat from Central Florida to the Key's. but we live in West Palm Beach. Most of our boating is done in salt except when we go up to central FL.
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PatriYacht
Charter Member
If you are looking for big power, Afr can't be beat with their 315 Cnc rect. port head. If you want more low end and drivability, they also have a couple of smaller oval port heads. They offer hard anodizing as an option.
The reason the 315CNC does very well in this application is that the intake/exhaust ration is the lowest of any head available in that size range. The CNC porting is a little more expensive and doesn't give you the same benefit in a blown application as it does in N/A, but they do work amazingly well. That would be my choice. There are probabaly plenty of metal finishing shops in your local area that can do the hard anodize for you. And they are fully coated.
http://www.profilerperformance.com/bbc-heads-174.html
They call it an oval- looks like a hybrid.
It looks like they flow nicely on the intake side and have good volume while maintaining good velocity. The exhaust ratio is a little down. Probabaly wouldn't hurt them too badly on a N/A engine but you'd leave some on the table with a blower.
This is a nice source for data- and a good way of graphically seeing how and wht port volume is only one of many attributes that determine how well a head will work.
http://users.erols.com/srweiss/tablehdc.htm#Chevy_Big_Block
MERPerformance
Sponsor
Chris, It's a rect-oval 320 and 350, after that comes the SNIPER SERIES, full CNC, I have used the 385 on some 598s. Nice results! You do know, Darren Morgan, works for Profiler.
MERPerformance
Sponsor
Ray, You are right! I have used them on N/A and supercharged, on the supercharged you have to add more fuel and boost due to the flow. I have used the 12 degree heads also. As you know the castings are realy clean, plus Greg, does an excellent job on the CNC work.
MERPerformance
Sponsor
NO! They are cast in Ohio, and machined in North Carolina. Ray Franks, company started by casting aircraft parts. The castings are some of the best I have ever seen, the casting is a ceramic mold or it was up until now. I think they went to a clean sand cast to keep the price down. They started by casting a 12 degree head to compete in the Pro Stock Drag Racing, but the head required a OEM part number to be legal. Ray, had his own team and car, so since that didn't happen, he sold to others.
Sorry, for going on. You hit a nerve, asking if they were CHINESE. If you called Mike,Jan, or Dave @ Profiler and ask them that, they would FLIP-OUT!
You must have the Profiler, confused with PRO-COMP
Mark
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