Cam upgrade
 

Please help me select a cam!

Sonic 35ss.

461 cui.
9.5:1 compression ratio
rectangular port heads 990
weiand team G (looks like stealth) dual plane
Holley 850
Gil exhaust (silent choise).

Prefere hydraulic flat tappered (not roller lifters).

Takes a long time to look at all available cams (crane, comp, isky, ...), give me a shortcut!

/Goran:confused:

I'm no cam expert, but I do know that the short riser Gil Magnum Choice exhaust will hold you back (I have the same exhaust). The exhaust flows fine, but I think those risers can only accept very minimal cam overlap (if any), so your duration and LSA choices are going to be limited. If you run a Crane 168731, you would need to have it ground with a 112 or 114 LSA. You might get by with a 168721, but I think that's a significant drop in power from the 731. That said, you should still be able to make a lot of power.

Anyway, as I said, I'm certainly not a cam expert. So I'm very interested to hear what the smarter guys have to say.

Two good hydraulic flat tap cams are the crane cam found in Merc's 370,400,420,425,525... and Edelbrock's torquer cam. I don't have part numbers for you, but they can be found easily on their web-sights.

Both have 114 LSA so the overlap is minimal; there won't be any problems with your exhaust.

Erson JB 100 on a 112+4
Specs are 228/235 @ .050" with .540" lift.
I have used this cam on a couple of motors very similar to yours and it works great. Prop for 5200 to 5500 max.
No reversion with stock manifolds! Very good power from 2500 to 5500.
:)

I use the Edelbrock torker cam for very similar engines with good success. I have the same exhaust. That cam is 224, 232, .527, .553 on a 114 seperation.

I have 2 hp420 cam's and lifters in perfect cond., if interested

JMPH

Does someone know the Crane part number for Merc's 370,400,420,425,525 cam?

Thanks!
Goran

Goran,
Merc # 451-7892
Crane Part #132561.
Here is the spec card for that cam.
http://dab7.cranecams.com/SpecCard/D...1=Display+Card
Bob

JMPH, please let me know the price?
photos?

/Goran

Thanks Bob!

Please help me identify the cams I have now, the nb stamped are: UD, E7448, 288 296 H10.

Thanks
Goran

Goran,
Ultradyne
Int 288/Ex 296 110
I can check the master catalog if you need more info.
Bob

Thanks Bob,
Would love to get more info and be able to run it in Dyno 2000 and compare with the recomendations above. Then I will get a hint what will happen to my boat upgrading the cam.

Thanks!
/Goran

The Ultradyne 288/296 cam is 231*/239* on 110* lobes @.050" lift.

Lift is .550" intk/.575" exst

Back in the 1980's, this is the cam that Merc used in their 454cu.in. 440hp Cyclone engine. They also used it in their 482cu.in. 460hp engine which actually made more like 475hp.

Goran; I doen't have pictures, but they are in perfrct cond., I also have stock merc, 420 exh., rear lower exits with tailpipes 3" I really doen't know what they would be worth, I have had them stored for a few years, make me a reasonable offer and you can have them.

thks Joe