bbc cam selection
Thread Starter
Racer
Joined: Apr 2007
Posts: 364
Likes: 1
From: Dane Wisconsin
bbc cam selection
i have a 468 that will be going in to my 69 the car will have a tko trans in it a nine inch rear end it will be 60-40 street strip.
i'm looking for a cam that will complement this combo
468 cid
9:1 compression forged pistons
grumpy bill jenkins merlin oval port heads with head studs and mls gaskets
stock rods with arp bolts
scat 4340 crank
fully balanced
stock tri-power
hydraulic roller
the biggest problem is i don't know where the tri-power runs out of breath. i don't want a cam that is good for 6500 if the tri-power stops at 5500 or 7000 and 6000. my guess is a cam that is good to about 6,000 is going to be plenty. the cam that is in there is something goofy as far as i know has like .577 lift and low duration, not sure of .050 numbers but it was like 260ish advertised i think. stopped making power by about 5 and was down hill fast after that. that was with bigger heads and an demon 850.
i'm looking for a cam that will complement this combo
468 cid
9:1 compression forged pistons
grumpy bill jenkins merlin oval port heads with head studs and mls gaskets
stock rods with arp bolts
scat 4340 crank
fully balanced
stock tri-power
hydraulic roller
the biggest problem is i don't know where the tri-power runs out of breath. i don't want a cam that is good for 6500 if the tri-power stops at 5500 or 7000 and 6000. my guess is a cam that is good to about 6,000 is going to be plenty. the cam that is in there is something goofy as far as i know has like .577 lift and low duration, not sure of .050 numbers but it was like 260ish advertised i think. stopped making power by about 5 and was down hill fast after that. that was with bigger heads and an demon 850.
Melting Slicks
Joined: Aug 2006
Posts: 3,429
Likes: 20
From: Kingston Ontario
I picked a Lunati Voodoo cam. The 60213. It's .629 lift intake and exhaust and 241 and 249 dur in/ex. Unfortunately I can't tell you how it runs because my motor is as you see it in my avatar, stuck on the stand. It should work good in a 496. It would seem a little more lumpy in a 468. It costs about $550 for the cam and spring kit which includes retainers and locks. It's a nice billet hydraulic roller.
Thread Starter
Racer
Joined: Apr 2007
Posts: 364
Likes: 1
From: Dane Wisconsin
are those 50 numbers? that might not be a bad unit i am looking for a somewhat big cam just not anything that is going to be too big for the tri-power. don't want the cam to have the sweet power too high where the tri power can't go. but i want to have a nice lumpy idle 
Drifting
Joined: Aug 2005
Posts: 1,682
Likes: 3
From: League City TX
With only 9.0 to 1 compression, I think the Voodoo 60213 is a little large for you. I would step down one size to the 60212. Its .600" lift intake & exhaust. Duration @ .050" is 231 intake & 239 exhaust. Lobe sep. is 110.
Burning Brakes
Joined: Feb 2005
Posts: 894
Likes: 91
Hydraulic Roller vs. RPM
Unless you have some "high-end" secret I believe you'll be "hard-pressed" to get ANY retro-hydraulic into that (high) RPM range mentioned. It's not going to happen just yet!
The SB's will go that distance, but not the "big ones"!
As of today, we are using 160# closed pressures and 380# open @ .714" lifts and we have only attained 6500 RPM "safely" on all the dyno testing we've accrued to date!
With a C.R. of 9:1 (?) in a small(er) BB, I would stay small(er) on the cam anyway!
Good luck!
Thanks, Gary in N.Y.
P.S. Haven't tried the "bee-hives" yet, can't get past the "single-spring-syndrome". It took us 30 years of "advertising", to get away from the
"singles", making it somewhat difficult, if not impossible, to sleep nights giving my customers "singles" again!!! "Lose" a single spring, "lose" your unit!
The SB's will go that distance, but not the "big ones"!
As of today, we are using 160# closed pressures and 380# open @ .714" lifts and we have only attained 6500 RPM "safely" on all the dyno testing we've accrued to date!
With a C.R. of 9:1 (?) in a small(er) BB, I would stay small(er) on the cam anyway!
Good luck!
Thanks, Gary in N.Y.
P.S. Haven't tried the "bee-hives" yet, can't get past the "single-spring-syndrome". It took us 30 years of "advertising", to get away from the
"singles", making it somewhat difficult, if not impossible, to sleep nights giving my customers "singles" again!!! "Lose" a single spring, "lose" your unit!
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Melting Slicks
Joined: Aug 2006
Posts: 3,429
Likes: 20
From: Kingston Ontario
Unless you have some "high-end" secret I believe you'll be "hard-pressed" to get ANY retro-hydraulic into that (high) RPM range mentioned. It's not going to happen just yet!
The SB's will go that distance, but not the "big ones"!
As of today, we are using 160# closed pressures and 380# open @ .714" lifts and we have only attained 6500 RPM "safely" on all the dyno testing we've accrued to date!
With a C.R. of 9:1 (?) in a small(er) BB, I would stay small(er) on the cam anyway!
Good luck!
Thanks, Gary in N.Y.
P.S. Haven't tried the "bee-hives" yet, can't get past the "single-spring-syndrome". It took us 30 years of "advertising", to get away from the
"singles", making it somewhat difficult, if not impossible, to sleep nights giving my customers "singles" again!!! "Lose" a single spring, "lose" your unit!
The SB's will go that distance, but not the "big ones"!
As of today, we are using 160# closed pressures and 380# open @ .714" lifts and we have only attained 6500 RPM "safely" on all the dyno testing we've accrued to date!
With a C.R. of 9:1 (?) in a small(er) BB, I would stay small(er) on the cam anyway!
Good luck!
Thanks, Gary in N.Y.
P.S. Haven't tried the "bee-hives" yet, can't get past the "single-spring-syndrome". It took us 30 years of "advertising", to get away from the
"singles", making it somewhat difficult, if not impossible, to sleep nights giving my customers "singles" again!!! "Lose" a single spring, "lose" your unit!
I have read that hydraulic rollers don't rev too high.
Le Mans Master
Joined: Oct 2000
Posts: 7,831
Likes: 5
From: Austin TX
That 9 to 1 compression is leaving a lot on the table for a 40% strip car.
You might want to look into milling the heads or something...
Thread Starter
Racer
Joined: Apr 2007
Posts: 364
Likes: 1
From: Dane Wisconsin
this is just what i was told it was i will be pulling the heads to install mls gaskets so i will check piston numbers and quench area then i will have a better idea what is going on.
