I am at 9.25

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir

My valve lash....hmmmmm

I started out with Ersons recommendation....probably

I lash cold with a rough feeler gauge on assembly ....and by feel/vacume gauge there after......

Frankly once i know how a measured gap "feels" I just do the whole motor .....

I doubt Im very far off whatever Erson recommended.

Bren...Id leave the converter where it is .

My cam is 230/220....more intake duration than exhaust.

The difference between a 230 and a 220 is about the same as tight lash / loose lash.
(Chime in if you agree/disagree...Im half guessing here)

Note: my car has a tiny carb and exhaust> I get a great vacume signal and very nice idle mix. The car is never rich or over carbed. I have my advance curve matching my build and driving habits. Your combination will be different.

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Yeah....Im the one who destroyed this rare, vintage automobile.....

How are cam shafts ground? Can I pick what ever specs I want? I understand there are masters, but what can be adjusted?
I'd like a single pattern 220 duration cam that is .500-.530 lift. Or an dual pattern as long as its not in the 230 range. I notice that most cams in the 220 range seem to be around .465 lift. Is the lift I want going to be restricted by a master? Also can I pick other specs like:
@50
INTAKE OPENS:
TDC OVERLAP:
EXHAUST CLOSES:
EXHAUST OPENS:
INTAKE CLOSES:
LS:
Are all these numbers adjustable?

Maybe Doug you could help me fill in some of the numbers based on a 220 duration and a (110-112 LS (not set in stone)). I am looking for a little better fuel mileage and cleaner exhaust. I'd also like to improve my idle vacuum as its 13in now. I know the shorter duration will help that in of it'self.
I'd like to be able to call Ersons and tell them what I want and not have them guess on any of the numbers.

CR=9.25

Mostly street driven. Lets call it only street driven.

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir

That would be a lot of lift in a short duration....you might need a roller lifter to do that.

Did you have your head flowed? What were the flow numbers like at .400 and .500?

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Yeah....Im the one who destroyed this rare, vintage automobile.....

this is how my slant is set up and also how all my familys carburated cars are... i didnt know it wasnt common mopar practice though is there a reason they didnt do this from the factory? i know i have had the vac advance line get oil soaked and swell up to the point it wouldnt stay on. that was a pain to track down

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1975 Plymouth Duster,225/6 2bbl. and duels, 904, 7 1/4
1986 Dodge Charger Shelby, 2.2 Turbo I, A525

I didn't have the head flow tested. I remember ya all thinking the head work was crap when you guys checked out the pictures.

The lift:
That might be why we don't see it that high on a shorter duration cam. Can someone confirm this?

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir

Here's a cam that looks to be in the ball park.
Chrysler P4529343 221/221@50 .528 lift IO 40, IC 64, EO 68, EC 36, Overlap 68, LS 108, ICtl 102

Here's another
Chrysler P3690768 221/221@50 .520 lift I don't have valve info. Overlap 66, LS 110, ICtl 108

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir

Any input on these two cams. Maybe some ideal numbers to shoot for on a custom grind in this range? What are the limitation in terms of what can be custom ground?

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir

Bren,

Those factory duration at 0.050" numbers are bogus. that is more like a 240 @ 0.050" cam. Mopar did not measure their @0.050" durations, only advertised.

If you want something docile but good power, get an Erson 280/270 (230/220 @ 0.050") cam with 108 deg LSA. That should work very well with 9.25:1 and take the stink outta your exhaust. Install at 100-102 deg centerline and forget what they tell you.

Lou

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Home of Slant6-powered fun machines since 1988

Is there a place or link where I can look at all the numbers for that cam? (230/220@50

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir

just talked with John at Ersons and discussed basicly one cam with some tweecking.
Off the shelf is a 220/220 @50 .465 lift 111 LS +4 installed +4+2=+6
Valve events would be IO 3* IC 37* EO 45* EC -5* -2* overlap

Same cam but a 110 LS +2 installed +2+2=+4
IO 4* IC 37* EO 44* EC -4* 0*overlap

Same but 108 LS +2 installed +2+2=+4
IO 6* IC 34* EO 42* EC -2* 4* overlap

I am tring to cleanup the exhaust smell and help fuel mileage with out killing all the power. I am running 87 octane and don't mind running 93 octane if I have to. 9.25:1 CR I plan to lower the stall when I have the motor out down to 2200 -2500 rpm. I havn't decided yet.
Also I might install some 1.6 rockers someday to bring the lift back up some.

Any thoughts or suggestion as to which of these cam you'd go with?

PS I am using the +2 because I already have a +2* bushing drilled into the cam sproket that I'd like to use.

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir

Bren,

The 230/220 cam is just a mix of the Erson 280 lobe on the INT and 270 lobe on the EXH.

If that is really your CR, then the 270 cam should work well too and be very smooth and clean.

Lou

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Home of Slant6-powered fun machines since 1988

i alway thought chrysler used 85% of advertised dur to get there 0.050lift #`s??

Desk top dyno basicly says that this cam can be installed almost anywhere from 108-111 and +6 to -3 and the power is basicly the same. (other than power band movement) I like the 108 because if there is a chance for detonation, it is less likely with this one. I like the 110 because the exhaust should be cleaner and I could retard it some if it tries to detonate. I also have the option of moving up from 87 to 93 octane.
Do you think you could tell the difference between the 108 and the 110 just by standing behind the car at idle?

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir

Anyone would have trouble telling the difference of 2 degrees in any cam spec, LSA included. With that cam, your fuel smell should really clean up, assuming everything else is tuned properly.

Lou

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Home of Slant6-powered fun machines since 1988