Roller cam for mild blown 454

[bigsbetter]

I've been wanting to put in a hotter cam in my Gen V 454 in my 251 Convincor. My engine is a stock 330 horse Gen V 454 with a Weiand 177 supercharger, CMI headers and an 850 Holley. The supercharger has been on this engine for 6 years and I have had no problems with it at all. I know I should just leave it alone....its fast and reliable....but it doesn't sound good at an idle....sounds like a stock motor and I'm bored with that sound. I was considering the Mercruiser 525SC camshaft, (Crane part # 132561) which is used in there 454 with my same supercharger. But then I was thinking of going roller cam. I never have delt with roller cams. I know they are better, more power, less friction and more money, but How are the specs read? Since the lift occurs more drasticly, do they act as a larger cam even with the same specs as a flat tappet? I do not want a huge cam, I just want some lope at idle. It has to be 112 or 114 lobe separation for the reversion aspect. Has anyone had any experience with a mild blower roller cam engine?

 

[jazzy]

Crane 731 or 741 work real nice but you'll blow that motor up

 

[Wrenchmate]

Pretty sure Im running 731 that jazzys talkin about.
Its a crane marine applications hydraulic roller cam with the 112 degree
lobe separation your lookin for. Gross lift at 587int. 610 exh.
Dont think thats much over stock but sounds great with fair idle.
Also dont know much about super chargers and what cams are
better for them.

 

[corey331]

In my opinion, if you are going to tear your motor down far enough to convert to hydraulic roller, you should go ahead and spend a little more and at least put some better internals in the block. And if you are going that far, a 4 bolt main block would be nice too!! lol. I'd say you are pretty lucky to have gotten that much time out of a boosted 330hp motor. Tells me you have it set up right!!

If you decide not to convert to hydraulic roller, my dad has a stock 525sc cam he would sell. He had a piston let go in his, so he rebuilt using a GEN VI block so he converted to roller, and went with fuel injection and a whipple. If you are interested. let me know.

 

[bigsbetter]

In my opinion, if you are going to tear your motor down far enough to convert to hydraulic roller, you should go ahead and spend a little more and at least put some better internals in the block. And if you are going that far, a 4 bolt main block would be nice too!! lol. I'd say you are pretty lucky to have gotten that much time out of a boosted 330hp motor. Tells me you have it set up right!!

If you decide not to convert to hydraulic roller, my dad has a stock 525sc cam he would sell. He had a piston let go in his, so he rebuilt using a GEN VI block so he converted to roller, and went with fuel injection and a whipple. If you are interested. let me know.

I am suprised it has lasted this long also! I run it hard too. 2 years ago, the last run of the year I really put it to the test. Ran 17 miles straight down river at full throttle, only letting up a little for waves or whatever. I was trying to make myself an excuse to rebuild it! I run the total timing @ 28 degrees to be safe and just run premium pump gas.
Yes i may be interested in the 525sc cam. I'll PM you.

 

[Gimme Fuel]

Yea, a 330 was not built to hold up to that. Kudos to keeping your tuning mild and making it last! But if you want to make more power than what you have, you need a new short block for sure. Even some better heads would help a ton too.

 

[253 SED]

Crane 741 is what i used on my my blower engine....but everyone is telling you correct.....a 330 base motor needs some upgrades if your gonna make more power....heads...a good ignition....good head gaskets.....good rotating assembly.....Hell if your gonna go thru the trouble....bore it and stroke it to a 496.....up the timing to 33* and put some boost to it......makes a nice package in my boat and runs well