Don't bother on this build. That's just nit picking for exra $$$$.

Just so we get the cams basics down, here's a quote from me in another forum:

I don't know a lot about cams but what are you trying to tell me :party-smiley-004:

the first two are the 330-365 mag flat tappet cams followed by the 310 and 454 mag post 94 or 5 roller which i think is still rated 365 hp. they got very conservative on the lift on the later mag roller cam. the 454 HO is a crate engine rated 425 HP at the crank. that cam has a good bit more lift, similar duration and a 112 lobe sep angle. it is a bit much cam for peanut heads but it will do just fine and be in the ballpark when you upgrade to rectangle or aftermarket alum heads. with the Gil exhausts there are no real reversion issues with that cam. apparently you have to watch valve to piston clearance with those pistons. the valve relief is not real deep. and will be even more important to watch with the 2.18 or 2.25 (or 2.3?) valves in the next set of heads.

I want to run a bob m cam with a set of aluminum heads maybe and my short block but I might just run this set up for the next 2 seasons. I want to use my moral lifters and comp roller rockers but that means a roller cam. I like the looks of the 454 ho cam but you think it will be overkill?

Also I just want to say thanks to everyone on oso this one of the most knowledgeable and helpful forums I have ever been on

Speed secret.

Teddy Peanut Butter (made in Everett, MA) is amongst the best.

And never refer to merc published cam specs .if your eyeballs are on the numbers on the back of a oe roller because its in your hand go to the gm crate spec for the mag and vortec .but that majic flat tappet that adds 100 horses to the wagon motor , thats something something there .

I would consider finding someone with a good takeout Mag roller cam and buy it from them to run with your peanut port heads. I think Mike Tkach on this forum had a couple for sale recently. You could probably find one for less than $150. You can run your Morel lifters with this cam no problem. You may or may not have to run a custom length pushrod to get your valvetrain geomoetry set up correctly. Pretty sure with such a moderate lift you could wing it with the Mag roller and run the stock length pushrods and even the stock rocker arms. If you had a Gen VI instead of Gen V it would be a simple matter of running the stock roller lifters and dog bone retainers, and store away your Morel's for when you order up that monster cam from Bob.

I ran the piss out of a two bolt main, cast crank mild blower, (8-71), in a jet boat for 6-7 years. Never a hiccup until my dumb ass buddy ran it out of gas at 6,000 rpm. We went back with the same block and crank though.

so do you guy think that the 454ho cam will have to much lift for the peanut ports? or would I be better off with the mag roller installed at .050”. if I am not mistaken I want to keep the duration under 235 and lsa no more than 112.

I doubt it, without some work to shorten the guides and changing seals. Peanut ports can handle around .500 lift, but not sure of exact spec. I got stuck and had to switch them back on when a 781 leaked. My cam runs.565 and I had to have the guides /seals worked to run them (but it salvaged a month of summer :)). It was more than .050 that had to be cut to get decent clearance, though. Only way to know is measure - compress the valve to the lift required and measure . You want.050 min between retainer and seal/guide.

Did you lose any power going back to the peanuts?

What about http://www.summitracing.com/parts/cca-11-232-3 ?

chris that is not a hyd roller camshaft. i am going to measure the max lift for the heads and see what i come up with. i know comp cams makes a tools to cut down your valve gides to get more clearance. so with the 454 ho cam i am going to need about .600 between the seal and the retainer that will leave about 060 clearance. what kind of seat and open pressure do you guys think 130ish seat 360ish open (sorry i don't have my book infront of me to check numbers)

5 mph, so 100 hp or so. It's a mild build, 450 hp range - a little warmer than the old 420

peanut port 156 casting number •PORT SIZE: 195
•CHAMBER: 115cc
•VALVE SIZE: 2.06 / 1.72
•PRICE: N/A
•[email protected]: 54 / 35
•[email protected]: 123 / 87
•[email protected]: 184 / 121
•[email protected]: 222 / 147
•[email protected]: 226 / 168
•[email protected]: 226 / 174
•[email protected]: 227 / 176

Cam specs
510/540. 112 LSA 211/230 dur at .050.
What kind of spring pressure?

Not the best flowing numbers but with a little clean up of the ports maybe alittle better. But with the lift of the 454ho cam I should be right in the max flow of the heads. I am going to measure the seal to retainer clearance this weekend and see what I got. Any thoughts

I have a set of peanuts on the shelf next to some 781s the thought has crossed my mind to rework them just for the hell of it .gmpp catalog should give ya springs for ho cam .still going to be able to use rotators?you ought to scare up the peanut port build up article by lingenfelter .

i just got some clearance the backyard a$$hole way. bought a set of comp cams 3/8 umbrella seals. they give a few thousandths over stock GM nylon with viton grommet umbrellas. then i took out my trusty belt sander and started shaving them shorter. you only need intake seals. exhaust has no vacuum on them so seals are unnecessary. excess stem clearance will give a puff of smoke on startup only. about 1 minute of sanding to a seal gives me 600 of valve travel before seal hits retainer. i have a 1 inch travel dial indicator and magnetic stand for it. i may also kiss the tops of the intake guides with a dremel for another .025 or so...edit; apparently there is a lot more room on the exhaust side. i have 650 of travel with seals on exhaust. 800 total travel without seals. of course this is 241 L29 heads. but i can't see the guide lengths being much diff. what casting number are your peanuts?

Derek sounds like what I am going to do but I might use a mill vs a belt sander lol. With the trw 2399 pistons they have a 13.8 cc domes and with 540 lift do you think that the valves will hit the pistons. Trying to figure it out befor I buy the cam

there is a lot of talk about valve clearance with 2399 cuz their valve relief is small, but it is a stock replacement piston for the LS6. has block been decked? heads milled? larger than 2.19 intake valves? (2.06 is 1/8th smaller) from what i hear it is not so much the depth of the valve relief as the diameter valve the relief is made for. The factory solid lifter cam in the LS6 had a duration of 242 degrees @.050 and a lift of .520/.520 on a 108 LSA. 454 HO 211/230 Duration @.050, .510/.540 Lift, LSA 112 i THINK you are OK. i think the clearance issues are with 2.25 or 2.3 valves and drag strip durations...

UPDATE. I found a set of 088's for a great deal so I bought them. Good bye peanut butters. The 088's are off of a 502 mag efi. I just need to figure out a cam for it now. I am thinking the 500efi cam but I am worried about revert from the exhaust. I do not have the manifolds any more (long story) so I still need exhaust but I will be using captains call. suggestions

500 efi specs. http://www.offshoreonly.com/forums/g...cam-specs.html you don't wanna go back to stock merc exhaust with that cam. just got me a set of 088's too, with fact intake... now i need pistons.

I'm seeing another call to Bob Madiera.