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Tahoe540

06-01-2018 09:52 AM

Another Cam recommendation

Not very happy with the performance of this reground cam so I am looking for something to push my single 30 ft Advantage better than what I have. I currently have a Crane 741 in my Summit Racing cart to buy but before I pull the trigger I wanted to see if someone had something better to suggest. I have read a ton of threads on here on cams and the 741 is very popular it seems. My motor is a 555 with just over 10:1 compression and has some massaged 088 heads with a single plane intake. My main concern is reversion as I have Imco Thumper exhaust. Would love to have headers but just not in the cards for right now. I also have a step nose Gen VI cam.

https://cimg4.ibsrv.net/gimg/www.off...7845635882.jpg

Baja Rooster

06-01-2018 09:58 AM

The Comp Cams 525EFI cam has same specs as the 741 but with 114 LSA

SB	06-01-2018 10:07 AM

Don't you boat at a bunch of elevation tahoe540 ?

Tahoe540

06-01-2018 10:10 AM

Quote:

Originally Posted by SB (Post 4629581)

Don't you boat at a bunch of elevation tahoe540 ?

Yes I mainly boat on Lake Tahoe at 6200 ft elevation. Have to stay N/A due to no room for blower pulleys. Trying to make the best of what I have to work with.

F-2 Speedy

06-01-2018 10:12 AM

the note on the card recommends installed @ 6* advanced, is that where you put it ?

Tahoe540

06-01-2018 10:30 AM

Quote:

Originally Posted by F-2 Speedy (Post 4629583)

the note on the card recommends installed @ 6* advanced, is that where you put it ?

I did install it @6* advanced when it was a 548 and got some very minimal signs of reversion. Since I rebuilt it this winter I installed it only 2 degrees advanced and am seeing reversion plus not very happy with the performance even though it dyno'd well as a 548 at 6* advance.https://cimg9.ibsrv.net/gimg/www.off...d63a990a2d.jpg

Ryan00TJ

06-01-2018 10:34 AM

What are you not happy with about current cam? I'm not in love with the current cam specs. Single pattern cam with poor flowing 088 exhaust ports and restrictive exhaust. 6-10 degrees more exhaust duration than intake will help your setup. IMO......741 cam is too small for a 10:1 555ci. It should help with reversion though.

Baja Rooster

06-01-2018 10:39 AM

Well, we did mention turbo;). What’s the current cam specs? Edit: Nevermind. The cam card pic finally loaded.

Baja Rooster

06-01-2018 10:47 AM

I’m no engine builder, but everything seems kinda small for the size engine that you’ve got. Getting power at elevation is tough as you’ve got to pack in tons of air to get any power and your set up is on the mild side for even a 502. My guess is that you’ll need better heads and a bigger cam to get enough air for the power that you want.

Tahoe540

06-01-2018 11:04 AM

Quote:

Originally Posted by Ryan00TJ (Post 4629591)

This is the only cam I have had for this boat and engine so just looking to see what might be a better choice with minimal reversion with my crappy exhaust. I also feel the 741 is too small and that is why I am asking for suggestions. May just end up getting a custom ground done as that has been my best outcome on past motors.

endeavor1

06-01-2018 11:21 AM

I’d be looking at cranes 651 cam. The 741s I had fell on their face @ 5200ish with my old 565s and 320 heads. 651s woke the engines up. I was at 9.2:1 iirc

Tahoe540

06-01-2018 11:52 AM

Quote:

Originally Posted by endeavor1 (Post 4629602)

I’d be looking at cranes 651 cam. The 741s I had fell on their face @ 5200ish with my old 565s and 320 heads. 651s woke the engines up. I was at 9.2:1 iirc

That looks like a much better cam for my size motor. Read some threads on the 651 and some guys have made some good power with motors up to 598 cu inch with this cam.

Thanks

TylerBurich

06-01-2018 01:25 PM

Quote:

Originally Posted by Tahoe540 (Post 4629607)

That looks like a much better cam for my size motor. Read some threads on the 651 and some guys have made some good power with motors up to 598 cu inch with this cam.

Thanks

Used a Crane with 4 degrees more intake duration than a 651 on a 533 10:1 deal a few years ago, didn't seem to make any more power than the 651 in the previous 540 setup so hindsight I would suggest sticking with the 651 if doing it again. Great cam.

F-2 Speedy

06-01-2018 01:48 PM

the 651 with the right heads will probably work fine, I dont see the 088's flowing enough to make a big difference with a cam only change, remember he's running up in the mountains 6400'

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