284/484 MP camshaft in a 440
- Thread starter Boz
- Start date
rumblefish360
Well-Known Member
The cam could use some decent compresion in order not to loose to much torque down low.
It's not a bad cam, it just needs certain things for it to perform at it's best. Year 440 dependent, a head milling for a rise in the ratio and a balanced head porting, not much is needed, would do very well.
I say balanced head porting because it is a single pattern cam.
It's not a bad cam, it just needs certain things for it to perform at it's best. Year 440 dependent, a head milling for a rise in the ratio and a balanced head porting, not much is needed, would do very well.
I say balanced head porting because it is a single pattern cam.
Histoy
Well-Known Member
I ran that cam in my '68 GTX. I chose it over the 509 cam because my GTX had power brakes, and the 484 purple cam carried higher vacuum at idle. It was a little lopey at idle, which I think you want, but it did seem to lose a little torque down low compared to the stock cam.
rumblefish360
Well-Known Member
In order to make a have way decent suggestion on a cam, tell us what you want out of the car and how you want it to perform and in what area.
Tell us what car it is (Weight if possible) tranny, rear gear ratio, tire size and if there is something else besides a stock stall converter in there. Also, would changing out a converter be OK with you?
Tell us what car it is (Weight if possible) tranny, rear gear ratio, tire size and if there is something else besides a stock stall converter in there. Also, would changing out a converter be OK with you?
Boz
Well-Known Member
Car is a 68 Satellite 727 Trans, 3.23 8.75 going to be a Driver but wanting it to run decent when I get on the skinny pedal. A stall wouldn't bother me either. I was doing some checking and someone said this 440 is only 230 Horse? The 318 in my parts car is 230 horse. Am i wasting time by messing with the 440?
daredevil
Well-Known Member
port the crap out of the exhaust side. a lot of mopar cams have more lift and duration on the exhaust as this is the stock heads downfall.
69 Runner
ADMIN wif a corner office (Deceased - RIP)
If you do any porting leave the exhaust floors alone...especially on a 346 or 452 head
mguner
Well-Known Member
When you set the advance curve up it will fill the low end back up quite a bit along with the revised fuel ratio and elimination of the EGR system. If you can mill the heads or find some early model closed chamber castings that will cure alot of the compression issues. That engine will smoke the 318 hands down, you are not wasting your time.
daredevil
Well-Known Member
the roof and a bowl plunge cut is what i was referring to
rumblefish360
Well-Known Member
Your not wasting time with the 440 even if it is a low compresion engine. A minor milling of the head will restore some compresion. Going up 1 full point to 9.0-1 is enuff to handle moderate cams.
The issue right now is the rear gear ratio. The 3.23 in the car really will not tolorate a cam much bigger than 220* @ .050 and a converter change would only help a little bit.
Your in a little catch22 here between the things that the car has now and what would help.
How fast do you want to go in the 1/4 mile?
Is a gear change OK?
Don't focus in on the HP level. Focus in on the torque output.
IMO, do not port the heads at all at this point, just leave them be and use a split duration cam to help it breath.
The issue right now is the rear gear ratio. The 3.23 in the car really will not tolorate a cam much bigger than 220* @ .050 and a converter change would only help a little bit.
Your in a little catch22 here between the things that the car has now and what would help.
How fast do you want to go in the 1/4 mile?
Is a gear change OK?
Don't focus in on the HP level. Focus in on the torque output.
IMO, do not port the heads at all at this point, just leave them be and use a split duration cam to help it breath.
rumblefish360
Well-Known Member
IMO for some Hwy. useage, a 3.73 gear. Tire no larger than 27-1/2 inchs. Width? As wide as you can stuff unde there.
Meep-Meep
дворянин
Personally I'd go with something like this http://store.summitracing.com/partdetail.asp?part=CRN-643904&autoview=sku
It won't bleed off your cylinder pressure and should be great with your 3.23's. Choose a cam that works with the lower compression and you will be a happy camper! Pocket porting the heads is highly recommended, but do not reshape the short side radius on anything. Just blend from the bottom of the valve seat to the port walls. I'd go with a set of 906's because of the superior port design, or 915's for the good ports and added squeeze. You can use a stock 318/727 torque converter for a little more stall for cheap.
It won't bleed off your cylinder pressure and should be great with your 3.23's. Choose a cam that works with the lower compression and you will be a happy camper! Pocket porting the heads is highly recommended, but do not reshape the short side radius on anything. Just blend from the bottom of the valve seat to the port walls. I'd go with a set of 906's because of the superior port design, or 915's for the good ports and added squeeze. You can use a stock 318/727 torque converter for a little more stall for cheap.
69 Runner
ADMIN wif a corner office (Deceased - RIP)
That's a smaller cam than magnum motors came with from the factory. So it's no wonder it won't bleed off any compression.
daredevil
Well-Known Member
you cant bleed off compression only cylinder pressure. theres a big difference
69 Runner
ADMIN wif a corner office (Deceased - RIP)
misspoke sorry
but it's still a tiny cam
but it's still a tiny cam
daredevil
Well-Known Member
no need to be sorry i was just trying to stop any confusion
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