455 Cam Question

[Taylorman]

For those of you running high compression pistons 9-10:1 in your 455, what cam are you running. Im trying to find out about lobe seperation and how it affects performance in a jet boat.

[Anthony75]

I am running a hydraulic roller specs are 236 int. 244 ex. @.050 .544 lift 110 lobe separation with 10.5 to 1 .040 455 olds.

[sidewound]

I'm running a hydraulic with full roller rockers. 518 lift, 244 duration, lobe sep. 110.
Peace Man
CESAR :cool:
Havn't started it yet tho. :D
Peace Man
CESAR

[sidewound]

OOOOPs Forgot.
9.5 to 1 . .040 over 455

[Taylorman]

The reason I ask is im in the process of rebuilding my 455 and a guy in town told me I should be running a cam with 114 seperation. I am currently running an Isky 280 int 280 exh. 517 lift and 108 seperation. So my question is what is the difference between a car cam and a boat cam?

[Wet Dream]

The jet cam produces more torque through more of the rpm range compared to a car cam.

[Taylorman]

How. What specification (duration, lift, lobe seperation) make a cam better for a boat or car?

[nelsonf]

I am running a Engle 523 544 236 248 @50 just Installed it. Had a Comp 518 518 244 244 @ 50 i hated that cam no Midrange and would only turn my A Impellar 4900 new cam has major midrange still only getting 5000 but have alot of tuning left in it oh the Motor is a 060 455 10.5 to 1

[396_WAYS_TO_SPIT]

I just put a new cam in my olds 455 .60 over and let me tell you it woke the motor up;) the specs are comp cams: 2000-6000 rpm,230@.50 duration,280 advertised,.490 lift and 110 lobe seperation. The guy that has been helping me said not to go over 230@.50 duration because that motor will never see the rpm's to make the power. By the way I have 9.5-1 comp and she sings from idle through the top end and I still have more to go;) I am still adjusting the motor.
396

[Omega21]

You know, the Oldsmobile camshaft wizard is UDHarold on realoldspower.com...he's the guy that would know what's what with an Olds cam.
Oh yeah, FCRTerry is really good with them as well.
Todd
[ April 22, 2003, 12:25 AM: Message edited by: Omega21 ]

[GlastronGuy]

Omega21:
You know, the Oldsmobile camshaft wizard is UDHarold on realoldspower.com...he's the guy that would know what's what with an Olds cam.
Oh yeah, FCRTerry is really good with them as well.
Todd Are car and boat motors built with the exact same specs? How about lobe seperation of the cams?

[GlastronGuy]

Taylorman
Did you ever get an answer to the original question?

[Taylorman]

Not really. Im going to keep the cam I have now. Im going up on compression since I have to bore my cylinders. Going to the 2323 pistons. About 9.7:1 with my heads. Hopefully that will get me from 63-80. NOT!! Maybe a couple of mph. We will see. Oh, just got one of HTP's ride plate and shoe kits. I will not put it on until after I get a good feel of the performance increase with the new motor. Im hoping for good things from that shoe.

[GlastronGuy]

You should be able to hit 63 easily. This is the cam we are using.
Part #JM-22-25-108,
Intake Lift 0.512
Exhaust Lift 0.523
Adv. Int/Exh Duration 274°/280°
Intake @.050 230°
Exhaust @.050 236°
Lobe Separation 108°
RPM Range 1400-6000
This build (http://home.attbi.com/~glastron_carlson/wsb/html/view.cgi-photo.html--SiteID-317712.html) is good for 62 GPS in a deep V with A impeller in an E pump, 10/1, logs and Q-Jet carb.

[Taylorman]

What I meant jokingly was I would go from 63 to 80. Im at 63 mph now with my 8:1 comp pistons. Im hoping for a couple more mph with about 10:1 comp. which is about what I will get with new 2323 pistons.

[GlastronGuy]

Taylorman:
What I meant jokingly was I would go from 63 to 80. Im at 63 mph now with my 8:1 comp pistons. Im hoping for a couple more mph with about 10:1 comp. which is about what I will get with new 2323 pistons. :) My bad.

[sleekster]

i run a bbc but for what it is worth i run a crane cams int 325 exh 336 dur. int 553 exh 571 lift with a 114 lobe separation, 11:1 pistons and makes 474.8 hp @5500 and 501.6 torque @4250 on the dyno.