Offshoreonly.com - Cam swap

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I’m truly sorry that I asked anyone here for any advice. I’m really not the type of person to have to defend myself for asking a question or explaining my 800 RPM which three mechanicsSet. Nor will I answer A goofball about an MP3 player and a surge answer When there is no surge at idle with a 177 blower.. But I thank the other ones that had some knowledge of what they’re talking about.
Phragle,your right,your not an engine builder. To the other people especially in the beginning of my question, thank you for being professional. Sorry again for asking a question. Ciao

Quote:

Originally Posted by Jojoegen (Post 4798139)

I knew they’d be an idiot somewhere. Reality is not your cup of tea, SB!lol

You came here asking for answers and opinions.

Blame a guy for being honest ?

Same theme, you are trying to push people to answer what you want.

LOL is not on the floor rolling and laughing.

I speak in round table talk.You don't know that yet. That;s fine.

Oh well.

Yes, I am an idiot and sometimes called a deplorable. I am dirty 90% of my day. I smell like walmart too. I am fine with that. Lol:)

Just so others know, that aren't familiar with the mutha thunper cams, they are typically cut with a 107 LSA and have 13-14 more degrees exhaust degrees than intake.

Here is one xample: https://www.summitracing.com/parts/c...make/chevrolet

This, with more duration than needed, is what give these cams the rough idle.

i’m sorry SB. You’re absolutely right I came here looking for answers and there’s more than one answer to the problem. When it looks like a duck and acts like a duck and quacks like a duck it’s a duck so your lol answers made me feel like an ass regardless of how you’re trying to explain them away. There was no need for that. Just answer the questions honestly true to the point and not the way you put it. It’s embarrassing. You know it, and I know it. Thank you very much for the information on the thumper. I’m answering each individual question to the best of my knowledge and there’s more than one answer that I have to give per question. My information is what I know the rest is for people to tell me what I don’t know Without trying to be a comedian. Hopefully this will help you in the future answering The uninformed questions. Hopefully from now on we can proceed as teacher and student Without added abbreviations. Thanks again for the info on the thumper .
now my question to you is would a thumper be OK to replace in my 454? Or should I just abandon this whole idea

Quote:

Originally Posted by Jojoegen (Post 4798097)

Thanks Griff. Between the cylinder head porting roller rockers and lifters ,exhaust changed to , I got it I’ve had a number of engines built for me even one for my cobra which is a 427 550 horse but this time being lazy I’m being told that the cam swap to a crane cam 168741 would do almost as good without having to do everything. The engine only has 32 hours on a rebuild at which time he put in a little wild or Kim and a 177 blower. But I have no idea what else he’s done which would require a total rip down of the motor to find out I was thinking about a mother thumper or a big mother thumper. This mechanic wants to put the crane cam 168741 in saying that it’ll give me what I want but I just don’t think so. Thanks for the reply

Unless you want to spin your engine to 5800rpms, that cam is too big for a marine 454.
The nearly ideal cam for what you have is 168731. BTW-Crane Cams is GONE.
You've got basically a 525SC Clone. If you want to do some real research, do an advanced search with 525SC and my screen name. You'll see numerous threads and posts from several knowledgeable people. Ask your "mechanic" how many of these types of marine builds he has actually done.

Thanks Griff. You have answered my questions. This is what I was trying to get to. I had no idea crane cams was gone . I will do as you ask and learn from it .again thanks so much

Quote:

Originally Posted by Jojoegen (Post 4798142)

Phragle,your right,your not an engine builder. To the other people especially in the beginning of my question, thank you for being professional. Sorry again for asking a question. Ciao

Yep. I must be hallucinating.. my 454 with a 177 dynoed over 650, runs great in the boat and sounds nice. 731 cam btw..

Quote:

Originally Posted by phragle (Post 4798177)

Yep. I must be hallucinating.. my 454 with a 177 dynoed over 650, runs great in the boat and sounds nice. 731 cam btw..

BUT does it have a high, raspy, " ratty tat" idle ? 🤣

Quote:

Originally Posted by Jojoegen (Post 4798173)

Thanks Griff. You have answered my questions. This is what I was trying to get to. I had no idea crane cams was gone . I will do as you ask and learn from it .again thanks so much

Put a stock Mercruiser cam back in and call it a day.
Esp if 35 mph is your goal ....
My bone stock 454 does that at 3k rpm in my Baja 252.
Have you driven your 272 yet?

Quote:

Originally Posted by sutphen 30 (Post 4798034)

your gonna need a 3/4 race cam to get that sick sounding bravo busting sound.

3/4 cams are for posers. ALWAYS go full race.