How much HP and torque
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Elder User
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How much HP and torque
How much HP and torque?
410 ci (4.050” x 3.980”)
Edelbrock Performer intake
Edelbrock aluminum heads milled for 9.66:1 compression
2.09 intake valve
1.65 exh valve
hyd lifters
Crower cam (270HDP):
Duration @ .050 = 210/220
Lift = .493/.521
Lobe separation = 112°
Lobe lift = .280/.298
Roller rockers = 1.76 ratio
Edelbrock 650 carb
410 ci (4.050” x 3.980”)
Edelbrock Performer intake
Edelbrock aluminum heads milled for 9.66:1 compression
2.09 intake valve
1.65 exh valve
hyd lifters
Crower cam (270HDP):
Duration @ .050 = 210/220
Lift = .493/.521
Lobe separation = 112°
Lobe lift = .280/.298
Roller rockers = 1.76 ratio
Edelbrock 650 carb
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
I'd be happy to run it through DD2k for you, but there's something you must do first.
Get the valve events for that cam. By that I mean the IVO (intake valve opening), IVC (intake valve closing), EVO (exhaust valve opening) and EVC (exhaust valve closing) angles. Without them that cam cannot be accurately simulated. You'll have to call Crower since they are not listed on their website.
Get the valve events for that cam. By that I mean the IVO (intake valve opening), IVC (intake valve closing), EVO (exhaust valve opening) and EVC (exhaust valve closing) angles. Without them that cam cannot be accurately simulated. You'll have to call Crower since they are not listed on their website.
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
Those are still .050" specs. I'd call crower and beat it out of 'em. If they're interested in selling you a cam they'll tell you. However, I'll run it with the ones you gave earlier.
391hp @ 5000rpm, and 463ft-lbs @ 3500rpm.
Personally, I think the Crane 343941 would be a better choice. That would get you 411hp @ 5500rpm, and 450ft-lbs @ 4000rpm. You lose a little low end torque but really gain on the top end.
391hp @ 5000rpm, and 463ft-lbs @ 3500rpm.
Personally, I think the Crane 343941 would be a better choice. That would get you 411hp @ 5500rpm, and 450ft-lbs @ 4000rpm. You lose a little low end torque but really gain on the top end.
Senior User
Joined: Sep 2003
Posts: 131
Likes: 1
same motor
Im building a similar motor:
422 cid (4.11" x 3.98")
stock rods, bolts and crank.
silv-o-lite pistons
9.9:1 CR
rollmaster billet timing set
Crower 270
stock rockers and shafts
comp 625 springs
HD DSC pushrods
Ported iron heads, polished chambers @72.5cc
SS 2.07 1.65 valves
Performer RPM
Holley 670 TA
Cheap headers
Precision oil pump with all oil mods.
10qt oil pan.
Based on my research, I expect around 390hp and should rev to 5500 no problem. It is going in an F-250 and i have been deeply contemplating weather or not to go bigger on the cam because i like to go fast! However I decided on the crower 270 for a few reasons. I didnt want much more RPM because of my stock bottom end. Another reason was because my budget leaves me with stock rockers and shafts, and the Crower 270 is getting close to the limits of the stock rockers/shafts. Also, since the motor is going in a pickup that can potentially carry heavy loads, and will be ran for extended periods at WFO. So bacically I went with the Crower 270 because of reliability. I left it at "Ill try this cam out, if i dont like it, then i'll just change it later on". Anyone else agree or disagree with my motor?
422 cid (4.11" x 3.98")
stock rods, bolts and crank.
silv-o-lite pistons
9.9:1 CR
rollmaster billet timing set
Crower 270
stock rockers and shafts
comp 625 springs
HD DSC pushrods
Ported iron heads, polished chambers @72.5cc
SS 2.07 1.65 valves
Performer RPM
Holley 670 TA
Cheap headers
Precision oil pump with all oil mods.
10qt oil pan.
Based on my research, I expect around 390hp and should rev to 5500 no problem. It is going in an F-250 and i have been deeply contemplating weather or not to go bigger on the cam because i like to go fast! However I decided on the crower 270 for a few reasons. I didnt want much more RPM because of my stock bottom end. Another reason was because my budget leaves me with stock rockers and shafts, and the Crower 270 is getting close to the limits of the stock rockers/shafts. Also, since the motor is going in a pickup that can potentially carry heavy loads, and will be ran for extended periods at WFO. So bacically I went with the Crower 270 because of reliability. I left it at "Ill try this cam out, if i dont like it, then i'll just change it later on". Anyone else agree or disagree with my motor?
Last edited by fling; Nov 27, 2004 at 12:36 PM.
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Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
The stock rockers and shafts might not work with that cam. For one, they're non-adjustable. This means if the base circle of the cam is smaller or bigger than the stock one it could either cause valvetrain noise or cause valves to remain open. Not good. I'd call crower and ask if the stock non-adjustable system will work with it.
FWIW, that cam looks identical to the Crane 343901 in DD2k. It is known to be a very mild cam, and they recommend a maximum of 9.5 compression for it. I think both of you will have problems with pinging if you use this cam. I'd look at either the Crane 343941, or the Crower 16241 (280HDP).
FWIW, that cam looks identical to the Crane 343901 in DD2k. It is known to be a very mild cam, and they recommend a maximum of 9.5 compression for it. I think both of you will have problems with pinging if you use this cam. I'd look at either the Crane 343941, or the Crower 16241 (280HDP).
Senior User
Joined: Sep 2003
Posts: 131
Likes: 1
well shoot
I will see how she runs with the Crower 270. The cam is saposed to work with stock rockers. The cam is also good to 10.5:1 CR per Crower. I just degreed my cam, and sealed up the timing cover and oil pan so, for now its a done deal. I dont really look forward to swapping out the cam while the motor is in the truck though. 
The Crower 270 cam is saposed to have a near stock idle as well. Do you have expirances towing with the Crane 343941?
The Crower 270 cam is saposed to have a near stock idle as well. Do you have expirances towing with the Crane 343941?
Last edited by fling; Nov 27, 2004 at 01:53 PM.
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
I dont, but I know a few people on here do, maybe they'll chime in. According to Crane, the 941 is supposed to be real good for towing.
This is the importance of valve timings. I'd be willing to bet that the Crower 270 grind closes the intake valve later than the Crane 901. Closing the intake valve later bleeds off more compression, allowing you to run a higher static compression ratio.
This is the importance of valve timings. I'd be willing to bet that the Crower 270 grind closes the intake valve later than the Crane 901. Closing the intake valve later bleeds off more compression, allowing you to run a higher static compression ratio.
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