Need some cam spec's

[gnarley]

I'm looking for some cam specs to make a decission on for my MK V 454. Can't build a 502 yet so while the engine is out I thought I'd change the bumpstick. It gets 5-7 #'s on 8.5:1 & won't see past 5500. Midrange cruise is 3000 to 4000 & I'm not looking for the super top end setup, just a nice mild blower cam that works well.
What lifts, durations & lobe centers??? Any idea's, opinions welcome.

[Schiada76]

Call George at Clay Smith, then order the cam he recomends. :D

[Blown 472]

gnarley:
I'm looking for some cam specs to make a decission on for my MK V 454. Can't build a 502 yet so while the engine is out I thought I'd change the bumpstick. It gets 5-7 #'s on 8.5:1 & won't see past 5500. Midrange cruise is 3000 to 4000 & I'm not looking for the super top end setup, just a nice mild blower cam that works well.
What lifts, durations & lobe centers??? Any idea's, opinions welcome. The beauty of the blower is you dont need a bunch of cam, but you do need at least a 112 to 114 lobe sep.

[Craig]

Lunati makes a good blower cam. Donnie runs one in his blown 509 (8-71) and I ran one in my blown 454 (B&M 250) It's part #50249X, this is a hydraulic roller. Intake lift is .578, exhaust is .595. Duration at .050" tappet lift is 232 degrees on the intake and aand 242 on the exhaust. (Advertised duration is 290 intake and 300 exhaust) This cam has a good idle and makes great power.
Craig

[gnarley]

Craig whats the RPM range?

[Craig]

You know, neither the cam card or the catalog says :confused: Looking back at my old dyno sheets, it started dropping off a little after 6200 rpm. I spun it to about 6000.
Craig

[gnarley]

Craig, sounds like its more than I would use & wouldn't work in my desired RPM range. I bet it starts peaking later in my desired range & hence would yield a waste since I would not see those RPM's & I wouldn't have the power where I want it. I would like to find one with good rise 2500-3500 and then a strong rise from 3500 to say 5500-5700 and drop off after that. Anything that continues to build after 5500 is just a waste for my needs.

[gnarley]

Craig, found your cam specs.
HYDRAULIC ROLLER, Fair idle. Very strong mid-range torque. Needs headers.
2000-6000
290°
300°
232°
242°
.578"
.595"
.340"
.350"
112° Sep
110° Int C/L
06°BTC 46°ABC /
55°BBC 07°ATC

[gnarley]

Where are all you cam guru's???

[hot_diggity_dog]

Call George at Clay Smith, then order the cam he recomends. Clay Smith (http://www.claysmithcams.com/)
Cam specification info (http://64.49.218.119/page.asp?id=5)
HDD :cool:

[FASTERDAMITT]

Gnarley,
What supercharger are you running? Big diff. in cam choice.
Chief Engines set me up with a hell of a deal for my 454 mag carb motor. So good I don't want to post $'s
Chevy performance rec port heads
Rpm intake
Lunati roller cam 224-236 110Ls
Roller rockers, guides, pushrods ect..
Procharged 5#'s boost this weekend 95mph 5400+, still climbing. I don't want to spin faster than 5200 so I'll prop up again. We went with 110Ls because of the Procharger's lack of bottom end boost. It will help with torque in lower r's

[gnarley]

[QUOTE]Originally posted by hot_diggity_dog:
Call George at Clay Smith, then order the cam he recomends.
I don't just talk to just one guy for his opinion & order from them, do you buy a car from the first salesman you talk to? It's too much of a pain in the ass to change again if they're wrong & not enough invested to dyno. So collaborative input from others who have tried different combos helps make a good decision, & maybe even with some input from George at Clay Smith. Everyone seems to have their own magic formula & I'd like to hear what the real numbers are from an actual combo that was tested & what parts were on that actual combo.
FASTERDAMITT the combo currently is 94 MK V 454 8.0:1, Weiand 177 running 4-7 #’s. The cam is a Comp Cams # 11-404-4, lift @.547 & duration I .232 & E .237 @ .050 & Lobe Separation at 114. this cam is for 3000 to 6500 & I’m not going to twist it that much so I am looking for a more suitable choice if possible where I don’t give up to much HP but end up lowering the usable HP range

[carreraboat]

hey faster were those iron heads and what comp. ratio?

[FASTERDAMITT]

Sorry I'm not familiar with the head specs on your motor. I would bet that the cam specs I'm running would be up your alley with a 112 or 114 lobe sep. The higher ls will bring up your powerband a little. Mine should peak around 5200 but still pulling past 5400.

[FASTERDAMITT]

Iron heads @ compression I can't remember 8 or 8.5
Gnarley, do you know your head flow specs? Rec or oval port. I can play on desktop dyno for ya. Not perfect but a close program
[ March 24, 2003, 07:42 PM: Message edited by: FASTERDAMITT ]

[Infomaniac]

The cam that B&M used when they made the blowers is an excellent cam. Call Crane they supplied it.
The cam for the 420 Mega Blower. It is not very big.

[gnarley]

[QUOTE]Originally posted by FASTERDAMITT:

Gnarley, do you know your head flow specs? Rec or oval port.
Stock heads now Small oval ports #10114156...91-up...oval...OPEN...Gen.V & VI 454, 118cc chamber. Junk in my opinion, but I can't replace them for a while. Comp is 8.0:1 & if you need the carb size is 830, any other inputs?

[FASTERDAMITT]

Gnarley,
From what I come up with, the cam you have is pretty good for your package. Your heads are limiting the flow and the larger cam is helping the restriction. It looks like your heads won't make much power than 5200 even with your bigger cam. You could go with a smaller gring for torque but, a little less on top. the best thing is to buy a set of used heads. I assume you have 2.00 and 1.60 valves. If you do end up getting heads you will then want a smaller cam to keep you in your powerband.
Buy heads!! A good set could net you 100hp with a blower. Check with a well known builders like Chief Engines ect.. I'm not an expert, just trying to get you in the right direction.

[502procharger]

Faster
i am glad the pulley worked ok. those were some good numbers. what boat are you running.

[gnarley]

I don't know what heads will work on a MK V but I have a nice set of older oval port open chamber heads (don't remember the part #) but they are all ported & ready to go & I know they have bigger ports & valves! I just don't think the MK IV heads will work on a MK V.
Anyone know???

[Cas]

Gnar,
I was going to offer up a set of oval ports to try but it looks like you're set with them. I also ran the DTD...FD is right, changing heads will give you just about 100hp right off the bat.
I'm not sure about your other heads fitting or not. When I need answers like that, I usually call John at LJ's machine shop in Napa....great guy and knows his stuff. His number is 707-255-4611.

[FASTERDAMITT]

502procharger,
26 American offshore 454ci. I'm going to a 32" Bravo1 next. expecting around 100mph running 5#'s boost now, maybe going to 7#'s. Not bad for a 454 in my opinion.
BIG thanks to you for letting me try your Procharger pulley!!!

[gnarley]

Thanks Steve! I called John & HE says that they will interchange WITH the conversion gasket by Felpro! As the water jackets are slightly different.
Has anyone here done this before? Any cooling problems???
I called Felpro & talked to a guy who said he had been an engine builder for about 30 years before doing this & built several hundred MK V's with MK IV heads! said the heads are the same (I'm going to look) but the gaskets are different for the MK V and force the water to circulate better so the MK V head gasket must be used! The MARINE Part # is 17042.
[ March 25, 2003, 09:55 AM: Message edited by: gnarley ]

[502procharger]

faster,
no problem, any time. my 30' chris cat is the same mold as the 30' AO. i look forward to seing how it runs with the 4 2.5's am outting on it. should be a fast boat. i guess we will see. :D