Old Country
Well-Known Member
Calling all non-novice motor-heads; I need some 'thoroughly thought-out advice'.
Eng specs:
408 Stroker - Eagle kit, forged crank, Eagle rods
Probe forged 10:5.1 pistons
Eddie RPM Perf heads - blue-printed and approx 3/4 ported
Probe 1.5 roller rockers
Eddie 6-pack manifold with Direct Connection Holley carbs (end carbs are mechanical)
Solid cam: 244 @ 50 / .539", 112 CL
Smith Bros Pushrods
ARP studs for mains & heads.
Kevco pan..
..etc...etc.. lots of cool yet standard stuff.. nothing too exotic.
Dyno tuned - came in at a slightly de-tuned 418 hp/436 tq at the tires (approx 535 hp / 560 tq)
Has roughly 1500 miles since new 2 yrs ago.
I've decided to switch out my 6-pack setup and try a 4 barrel... just because. I'm toss'n on a port-matched & slightly massaged Eddie Airgap & a Holley HP 750 street/mech sec, which has a good rep for a street setup (car is a 72 Duster 4 spd, 3.73 8 3/4)
The issues is this: I've a real nice custom solid cam carved by CamMotion Cams, simply a 'terrific cam' for this 408 6-pack setup, buuut it has that 112 CL, it may be 'perhaps' a bit soft on the dur/lift for this particular 408 AND this new 4 barrel setup... At least that's what has me bugged and why I'm here. ale:
I'm thinking of pulling the cam/lifters when I make the switch and trying this Lunati VooDoo solid stick:
Duration @ .050 (Int/Exh): 251/259
Gross Valve Lift (Int/Exh): .566"/.586"
LSA/ICL: 110/106
Valve Lash (Int/Exh): .016"/.016"
RPM Range: 2800-7000
Obviously this new cam has a bit more of everything (perhaps not enough?), and it's 110 CL... which is great since I won't be managing 3 carbs...ie: don't need as big a vac signal. But I'm not exactly happy at all about the big emphasis on the exhaust side (259/.586"), since my heads breath pretty well. Now I know it's not a huge cam, but this is just a lil street blaster, no race car, so I'm trying to push just a bit closer to that 'race' line in the sand without losing the fun factor when driving the car. Anyone whose driven a drag small block with a big roller setup at +265 dur/+.650 lift/108 CL" knows what I mean... no fun at all on da-street.#-o
I could go one step bigger to this one, but I'm fearful I'd be crossing THAT line:
Duration @ .050 (Int/Exh): 259/267
Gross Valve Lift (Int/Exh): .586/.606
LSA/ICL: 110/106
Valve Lash (Int/Exh): .016/.016
RPM Range: 3000-7200
So why am I here? Well.... I'm asking this group of wise & seasoned mopar motor-heads: "In your opinion, will the new cam make enough more power to be worth the cost & effort...?" OR "will I have to go even bigger to see any noticeable difference?" OR "am I being a bit foolish and the current cam will work just great with the 4 barrel..?"
I will check-in in a couple days to see if this manifests anything fruitful wisdom.
I thank you.:salut::
Eng specs:
408 Stroker - Eagle kit, forged crank, Eagle rods
Probe forged 10:5.1 pistons
Eddie RPM Perf heads - blue-printed and approx 3/4 ported
Probe 1.5 roller rockers
Eddie 6-pack manifold with Direct Connection Holley carbs (end carbs are mechanical)
Solid cam: 244 @ 50 / .539", 112 CL
Smith Bros Pushrods
ARP studs for mains & heads.
Kevco pan..
..etc...etc.. lots of cool yet standard stuff.. nothing too exotic.
Dyno tuned - came in at a slightly de-tuned 418 hp/436 tq at the tires (approx 535 hp / 560 tq)
Has roughly 1500 miles since new 2 yrs ago.
I've decided to switch out my 6-pack setup and try a 4 barrel... just because. I'm toss'n on a port-matched & slightly massaged Eddie Airgap & a Holley HP 750 street/mech sec, which has a good rep for a street setup (car is a 72 Duster 4 spd, 3.73 8 3/4)
The issues is this: I've a real nice custom solid cam carved by CamMotion Cams, simply a 'terrific cam' for this 408 6-pack setup, buuut it has that 112 CL, it may be 'perhaps' a bit soft on the dur/lift for this particular 408 AND this new 4 barrel setup... At least that's what has me bugged and why I'm here. ale:
I'm thinking of pulling the cam/lifters when I make the switch and trying this Lunati VooDoo solid stick:
Duration @ .050 (Int/Exh): 251/259
Gross Valve Lift (Int/Exh): .566"/.586"
LSA/ICL: 110/106
Valve Lash (Int/Exh): .016"/.016"
RPM Range: 2800-7000
Obviously this new cam has a bit more of everything (perhaps not enough?), and it's 110 CL... which is great since I won't be managing 3 carbs...ie: don't need as big a vac signal. But I'm not exactly happy at all about the big emphasis on the exhaust side (259/.586"), since my heads breath pretty well. Now I know it's not a huge cam, but this is just a lil street blaster, no race car, so I'm trying to push just a bit closer to that 'race' line in the sand without losing the fun factor when driving the car. Anyone whose driven a drag small block with a big roller setup at +265 dur/+.650 lift/108 CL" knows what I mean... no fun at all on da-street.#-o
I could go one step bigger to this one, but I'm fearful I'd be crossing THAT line:
Duration @ .050 (Int/Exh): 259/267
Gross Valve Lift (Int/Exh): .586/.606
LSA/ICL: 110/106
Valve Lash (Int/Exh): .016/.016
RPM Range: 3000-7200
So why am I here? Well.... I'm asking this group of wise & seasoned mopar motor-heads: "In your opinion, will the new cam make enough more power to be worth the cost & effort...?" OR "will I have to go even bigger to see any noticeable difference?" OR "am I being a bit foolish and the current cam will work just great with the 4 barrel..?"
I will check-in in a couple days to see if this manifests anything fruitful wisdom.
I thank you.:salut::