87sschev

Hi guys just joined up and had a few questions, this is my second build and am running with a 350 4 bolt main bored 30 over honed decked and all the good stuff along with a set of fully ported double hump heads, I have just about everything other than my camshaft, I want a big rumble with low end power and not sure what I want to go with, brand, size duration lift I heard mixed reviews about the ****** thumpers, always liked lunati and comp suggestions would be nice thank you.

skinny z

Do you have an idea what your compression ratio is? This goes hand in hand with the cam you'll select (big rumble and low end power notwithtstanding).
Is your engine assembled? Are the heads on?

87sschev

9 or 10 not too sure yet dissambeled still, just picked the block up in December from the shop, getting ready to throw her together soon.

skinny z

Not sure how up you are on engine theory. Here's a link to an interesting read regarding compression ratio and cam selection.
http://cochise.uia.net/pkelley2/DynamicCR.html
It'll give you an insight into where you can start. Since your engine is in pieces, you have plenty of options.
Of course, there are the questions of the vehicles intended purpose and what you have in the way of other parts. Daily driver, street strip, road racer....? Roller cam or flat tappet? Carb or EFI? Rear gear? Auto or manual trans? Premium fuel or regular? Is fuel economy a consideration? Etc. This will all play into the cam that works best and will let you fit whatever kind of personality you want in a way that won't kill performance.

87sschev

Building a street car, mild cam I was hoping someone with the same build could refer me to a camshaft with a nice lope with a range of 2000-6000, I have only had a comp and was wondering about other brands assult racing, lunati and other brands.

skinny z

My experience lies with Comp as well.
Build 10:1 and pick a cam in the mid 270 intake duration and you'll have plenty of torque production. Compression pressure will be high such that you'll need premium fuel with your iron heads. If you've a roller, the xr 270HR or 276HR are good choices. I've used the 276 on a Vortec build with 10:1.
I've put together a couple of iron headed SBCs in the last while. Seems the combination works very well. Sounds good but idles well. Plenty of power to 6000 rpm. Rough estimate based on weight and trap speed is 400hp. Plenty for a fun street car.
You may want to check out Lunati's/Vizards cam selection as well.

87sschev

Thanks man I'm doing a little research before I buy and have to hear some reviews about voodoo's cam's always been interested in those and those new bootlegger cams.

Ozz1967

iTrader: (4)

Roller cam or flat tappet?

I'm really happy with the Lunati Voodoo 60121 in my 355. Little lope but nothing over the top, but it is a roller cam.

Ozz1967

iTrader: (4)

I would also axe those double hump heads and find something newer. Even L98 heads are better than those older ones. Unless they're all you have/can afford of course.

87sschev

I'm going to stick with the 461 double humps.

skinny z

Nothing wrong with that provided they've been done properly. It used to be at one time that's all we had and plenty of guys were going fast. If you were to start from scratch, then the consensus opinion would be to ditch them. But if that's what you've got, then go with it.
Just to be sure to match the rest of your combination to the parts you have assembled. The cam is key here now since you have heads. Do your research and be sure to match the cam to the heads and compression ratio. If you have any data on the heads, that'll help in selecting a cam. Valve sizes...2.02/1.60? Do you know who did the heads? That might help in getting some info in them. Port volume, flow numbers, etc.

87sschev

Do not know much about them after the work had been done they have not seen the flow bench yet, they are the 461's, came from 327 in 64 through 66 intake is 1.94, exhaust is 1.5, 62 cc,

skinny z

I can't imagine that they'll have rocking flow numbers given the valve sizes. It took a lot for the OEMs to build the LT1 or Vortec head with valves of the same size. That said, you never know.
Put the rest of your engine specs together. Ones that'll let you reliably calculate your SCR and work out some decent cam specs from there.
If you don't know already you'll need: chamber volume (62cc), bore (4.030"), stroke (3.48"), piston dish/dome volume, head gasket dimensions and deck clearence.
If you didn't read the SCR/DCR primer in the link I posted previously, you may want to. It'll give some insight into how it all ties together.
You can make those heads work, just be informed about it.

87sschev

Guys, I was simply looking for suggestions from people with similar builds and hoping for feed back on their expierences and what they liked and disliked not be buried in articles about flow and chamber sizes when I asked for suggestions, i suppose people cant just answer the post as to how it was asked. Tell me to take my build in another direction switch my heads what ever at least recommend something, that being said thank you much, just suggestions on cams and people who have similar builds would be great thanks

redneckjoe

understand its hard to give a cam recommendation without knowing all the details of the build. i'm running a small comp 268 hyd flat tappet cam and i actually like it a lot. works great for the street.
if you go hyd flat tappet, beware. a few years ago the gov took out most of the ZDDP in motor oil. you'll wipe your cam in no time without the right oil or additive.
i've not used the mother thumper but i know a guy who did and he liked it.

SouthSide2

Sounds like a mother thumper is what you want. How ever strong low end torque is not realistic. I believe this cam is all about "Bark" with little "Bite". It will give you the sound you seek. You can not have both. But as it keeps some mid range power this cam looks to satisfy parking lot braggers. It's like stuffing a sock in your shorts.

87sschev

Strange reply but thank you I believe I'm going with the new bootlegger voodoo

skinny z

Which one have you decided on?
(Never did hear what style of lifter you intend to use).

SouthSide2

You have made your choice. I think you will be happy. Bootlegger just get's it done a little differently. Similar performance. Pease report your experience. As to give your thoughts on a pretend cam.

87sschev

I believe the specs were 277/304 500 lift, and will let you know, it'll be awhile before she's all assembled and ready to roll but I'll deff hit you back

Night rider327

iTrader: (13)

WOW!

You come across as a 'kid' acting like a jerk.

You need to read up on this stuff. The correct cam is very hard to pick.

Everything goes hand in hand and no two setups will be the same really.

10 cfm diff in head flow is enough to change a cam change.. So this guy's ported 461 heads may flow 190 cfm, this other guys may flow 220 cfm, and this last guy's came from somebody that knew somebody that worked in nascar back in the 60's and his was ported by that guy and flows 250 cfm

All 3 of those heads will need a different cam.

Compression ratio changes the cam need. In fact match the wrong compression and cam and it could be a lazy big, or it could ping it's self to death or nor run on anything under 110 octane..

Chamber size plays a big role in compression.

Again.. 9:1, 9.5:1, 10:1 and 10.5:1 will all need a different cam.

It's not as simple as just saying "hey anybody run something close to this, what cam did you use"

87sschev

Thanks for your concern

TTOP350

iTrader: (8)

Since you want cam advice but won't give out information needed to help you, I recommend a stock, "RV' or even the "3/4 race" cam.