Comp Cams XTQ290S-6 in 408 stroker?
- Thread starter Tomsun
- Start date
-
Hard to say what kind of power it will make for you; would need to know the rest of your combination. I'll say this it would be rowdy, streetable is very subjective. What are you willing to put up with? It's gonna need loose converter, gears.
As a side note, I have a Teener with an XTQ281s-6, strictly drag car, ran a best of 12.54, if the car was street legal and had plates on it, I would have driven it around town, but it would not be anything to take a trip in.
As a side note, I have a Teener with an XTQ281s-6, strictly drag car, ran a best of 12.54, if the car was street legal and had plates on it, I would have driven it around town, but it would not be anything to take a trip in.
Wyrmrider
Well-Known Member
HTQ series is for Chevies 842 lifter
go to comp catalog and look on pg s 69 and 70 for MOPAR grinds
if you are going to spend that kind of money get your monies worth
else check with someone that understands MOPARS
Mike Jones Street Performance | Jones Cams
(filling this out will ensure you have all the info a good grinder will need)
Bullet/ Ultradine
Engle
Crower PM Dart19666 a member here
Racer Brown
Howard
Lunati
vary widely in tech support
Think EDM lifters
and be sure you ask for at least the intake off the MOPAR list
go to comp catalog and look on pg s 69 and 70 for MOPAR grinds
if you are going to spend that kind of money get your monies worth
else check with someone that understands MOPARS
Mike Jones Street Performance | Jones Cams
(filling this out will ensure you have all the info a good grinder will need)
Bullet/ Ultradine
Engle
Crower PM Dart19666 a member here
Racer Brown
Howard
Lunati
vary widely in tech support
Think EDM lifters
and be sure you ask for at least the intake off the MOPAR list
yellow rose
Overnight Sensation
If Wy is correct (and I don't doubt that he is...I just don't have a Comp catalog...guess I should call and get one) and that's an .842 lobe I'd pass on that. That's a pretty quick lobe for that small lifter. That's about as fast as the MM lobe for the .904 lifter.
Wyrmrider
Well-Known Member
Lobe Catalog is online
COMP Cams Lobe Catalog
just re-checked
COMP Cams Valve Train Geometry
still useless
also in their mopar tech page
"Rocker Arm Geometry
Proper rocker arm geometry is necessary to ensure the maximum benefit from any cam design. Camshaft base circle, block deck height, cylinder head design and lifter design all contribute to possible errors in geometry, which must be compensated for with pushrod length and shaft height. Usually, a longer than stock pushrod will be necessary in a high performance engine, but care must be taken to choose the correct length."
now that really helps
COMP Cams Lobe Catalog
just re-checked
COMP Cams Valve Train Geometry
still useless
also in their mopar tech page
"Rocker Arm Geometry
Proper rocker arm geometry is necessary to ensure the maximum benefit from any cam design. Camshaft base circle, block deck height, cylinder head design and lifter design all contribute to possible errors in geometry, which must be compensated for with pushrod length and shaft height. Usually, a longer than stock pushrod will be necessary in a high performance engine, but care must be taken to choose the correct length."
now that really helps
How much power and how streetable it is, or not, is up to the end user and there vision and tolerance.
A 408 stroker with common optimized HP parts can make 600, + or - hp. Using less than this will yield 550-ish while using well ported racing heads, intake, exhaust, max carburation (sp?) could yield over 700 easy.
How much converter, gear, etc... is used depends on car weight and intended application of the parts.
Thanks guys...
I find it really interesting that no one appears to be using the Comp Cams XTQ290S-6 in a 408 stroker; not just on this forum but general google searches. Aim is 570-600HP (80% Drag, 20% Street).
On the Comp Cams website search feature with the following basic Search Parameters:
1) Engine = 273-360cui
2) Type = Solid Flat
3) RPM Range = 4,000-7,000 (Max RPM for my motor is 6,800. The stroker should drop the RPMs)
Comp Basic Search page Chrysler & Dodge - Camshafts - Products
The Comp Cams Search spits out the following 4 cams:
Option A) 277MM (Oval Track series) #20-631-5 251/255 (@.050) 0.570/0.582 (1.5:1) LSA 108 The MM profiles are the most aggressive Comp Grinds for a Mopar 0.904 lifter, so I don’t want to be on the bleeding edge of performance/reliability.
Option B) 306S (Magnum series) #20-249-4 260/260 (@.050) 0.555/0.555 (1.5:1) LSA 110
Option C) 290A-6 (Drag Race series) #20-249-4 255/255 (@.050) 0.540/0.540 (1.5:1) LSA 106
Option D) XTQ290S-6 (Oval Track/Strip series) #20-633-5 260/266 (@.050) 0.558/0.555 (1.5:1) LSA 106 This cam was the same cam that was recommend by Comp Cams after I filled out the detailed cam request form.
I’m looking for people with real world experience with any of these four cams in a 408 stroker by the XTQ290S-6 in particular would be great. Cheers.
Note: The other cams that I have been contemplating are:
Lunati VooDoo # 30200742 251/259 546/566 LSA 110
Lunati VooDoo # 30200743 259/267 566/586 LSA 110
Crane F-256/383-2S-8 # 690931 256/260 575/585 LSA 108
Crower 304FDP # 31312 250/254 581/595 LSA 108
Hughes various STL5054 or STL5460 or STL6064 LSA 108
I find it really interesting that no one appears to be using the Comp Cams XTQ290S-6 in a 408 stroker; not just on this forum but general google searches. Aim is 570-600HP (80% Drag, 20% Street).
On the Comp Cams website search feature with the following basic Search Parameters:
1) Engine = 273-360cui
2) Type = Solid Flat
3) RPM Range = 4,000-7,000 (Max RPM for my motor is 6,800. The stroker should drop the RPMs)
Comp Basic Search page Chrysler & Dodge - Camshafts - Products
The Comp Cams Search spits out the following 4 cams:
Option A) 277MM (Oval Track series) #20-631-5 251/255 (@.050) 0.570/0.582 (1.5:1) LSA 108 The MM profiles are the most aggressive Comp Grinds for a Mopar 0.904 lifter, so I don’t want to be on the bleeding edge of performance/reliability.
Option B) 306S (Magnum series) #20-249-4 260/260 (@.050) 0.555/0.555 (1.5:1) LSA 110
Option C) 290A-6 (Drag Race series) #20-249-4 255/255 (@.050) 0.540/0.540 (1.5:1) LSA 106
Option D) XTQ290S-6 (Oval Track/Strip series) #20-633-5 260/266 (@.050) 0.558/0.555 (1.5:1) LSA 106 This cam was the same cam that was recommend by Comp Cams after I filled out the detailed cam request form.
I’m looking for people with real world experience with any of these four cams in a 408 stroker by the XTQ290S-6 in particular would be great. Cheers.
Note: The other cams that I have been contemplating are:
Lunati VooDoo # 30200742 251/259 546/566 LSA 110
Lunati VooDoo # 30200743 259/267 566/586 LSA 110
Crane F-256/383-2S-8 # 690931 256/260 575/585 LSA 108
Crower 304FDP # 31312 250/254 581/595 LSA 108
Hughes various STL5054 or STL5460 or STL6064 LSA 108
yellow rose
Overnight Sensation
Why does it have to be a cam from the catalog??? Wyrmrider already posted the names of some very good cam grinders who will custom grind a cam for YOUR application. Why guess at it?
I'm not sure your guess on RPM is very good either. I'm 60 inches less than you, and 255 at .050 gets me max HP at 6600-6700 and a shift speed of about 7000.
Unless you are running W2 heads or better you are induction limited. Simple as that.
I think you need an MM lobe or equivalent, at least 260ish at .@050, somewhere as close to netting .600 lift as you can get even if you need 1.6 rockers (and you probably will) and an LSA no wider than 108 and probably 107 would be better. It will idle at 700 RPM if you let it (I don't do that) and be nice to drive.
Or, I could be nuttier than a jar of goobers.
Call someone. I prefer Jim at Racer Brown. You have to call him AFTER 2 PM eastern time. He answers the phone.
I'll PM you with the grind number of the cam I use. It isn't a a cam number like most people recognize from RB. Then you can call Jim and at least talk to him.
nm9stheham
Well-Known Member
Harder to do from Australia.
Wyrmrider
Well-Known Member
Tomsun wrote
"The MM profiles are the most aggressive Comp Grinds for a Mopar 0.904 lifter, so I don’t want to be on the bleeding edge of performance/reliability."
The MM lobes have been around a long time
as YR observed they are about the same as the chevy lobe but spread out over a bigger lifter
Engle and Mopar performance are slightly less radical- Engle is also easy todeal with
Howard More so
Bullet/ Ultradyne may have the widest selection- easy to deal with
Jones most likely has the most modern lobes
Crane .904 lobes are special order and also been around awhile
Me I'd fill out Jones cam card and get whatever he recommends
or do what YR suggests
do not just pick out of a catalogue
Hughes does not grind cams
I gave you a Crower member here to contact- he will also give you the straight shot or suggest what is best for you
are you thinking of beehive or dual springs
lots of decisions, it's iterative
a quick test is to compare recommendations with cams for a SBC
if they are the same- PASS
then check the recommendation against the vendors lobe list
have your head flows handy B4 deciding on a cam
"The MM profiles are the most aggressive Comp Grinds for a Mopar 0.904 lifter, so I don’t want to be on the bleeding edge of performance/reliability."
The MM lobes have been around a long time
as YR observed they are about the same as the chevy lobe but spread out over a bigger lifter
Engle and Mopar performance are slightly less radical- Engle is also easy todeal with
Howard More so
Bullet/ Ultradyne may have the widest selection- easy to deal with
Jones most likely has the most modern lobes
Crane .904 lobes are special order and also been around awhile
Me I'd fill out Jones cam card and get whatever he recommends
or do what YR suggests
do not just pick out of a catalogue
Hughes does not grind cams
I gave you a Crower member here to contact- he will also give you the straight shot or suggest what is best for you
are you thinking of beehive or dual springs
lots of decisions, it's iterative
a quick test is to compare recommendations with cams for a SBC
if they are the same- PASS
then check the recommendation against the vendors lobe list
have your head flows handy B4 deciding on a cam
yellow rose
Overnight Sensation
My bad. I didn't see he was upside down. Then a shelf cam or a cam someone stocks down there is probably the best option.
I'm using the Hughes cam that is 1 step larger than the last cam you listed (HUG STL6468AS-8). In my 408 with ported heads Edelbrocks it makes about the power you are looking for (570-600hp). I'm also about 25% street and 75% race....very happy with the cam.
@Tomsun I don’t know why you find it interesting but if you look at the cams spec for spec, there is probably a good reason why it is listed as the 4th choice.
I think it is a low lift cam for the duration @.050 it has. Not that 1.6 rockers couldn’t help adjust that..... but why.....
I think it is a low lift cam for the duration @.050 it has. Not that 1.6 rockers couldn’t help adjust that..... but why.....
Hi Fly, I’d love to make that sort of power. How much work have you done to the heads? Valves? Also, what comp ratio? Intake manifold, carby cfm? Thanks
Yeah, less options and parts in stock. I’m running out of time for my build.
The heads were a "stage II port" from Ryan Johnson (fully ported). The engine is 13:1 compression running on e85, Victor intake (port matched by me), I have 2 carbs that run the same. The first is a 750dp e85 carb that I built, the second is a new Holley XP 950 e85 carb. They both run the same for some odd reason, low 10's in the 1/4.
Edit: I'm also using Howards direct lube lifters...its a little peace of mind for flat tappet cams.
Wyrmrider
Well-Known Member
Tom
none of the cams in your list were designed for strokers with modern heads
given your choices
PM the crower rep and see if they ship to the land of wonder- the land down under
else Hughes if they ship
edm lifters- good choice
That first Comp MM cam would be their best choice with edm lifters if in stock and they ship
Lunati voodoo if they ship
IDK if Jones has any street/strip .904 grinds he says his EMV series is race only
Howard
Bullet
get some e-mails going
you can get some of these through summit or jegs if they ship
but YOU have to pick first
as YR says Racer Brown is one of the few that can pick for U
none of the cams in your list were designed for strokers with modern heads
given your choices
PM the crower rep and see if they ship to the land of wonder- the land down under
else Hughes if they ship
edm lifters- good choice
That first Comp MM cam would be their best choice with edm lifters if in stock and they ship
Lunati voodoo if they ship
IDK if Jones has any street/strip .904 grinds he says his EMV series is race only
Howard
Bullet
get some e-mails going
you can get some of these through summit or jegs if they ship
but YOU have to pick first
as YR says Racer Brown is one of the few that can pick for U
-
Similar threads
- Locked
