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Old 04-05-2009, 08:08 AM
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Advance / retard Camshaft ?

Hello. I have a Chevy Vega 2900 lbs empty with 355 SBC and th 350 W. 3000-3500 stall converter and 12 bolt w. 4.10:1 gears and 28" Et streets in the back
The motor has 10.5 compression
Gm Iron heads # 441
Edelbrock Torker intake ( the old one not torker II )
Holley Hp 750 cfm carb
Crane Powermax 272 / 284 - 454" / 480" lift Camshaft.
Headers and dual exhaust
MSD pro billet ignition with 6 al ignition box.
And maybe a little dose of nos in the future. ( 125 hp )

Heres the question since this is a relatively light car, should i retard the camshaft to get more top end power ? or just put it straight in.

Best Regards

Last edited by monzter; 04-05-2009 at 09:05 AM.
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Old 04-05-2009, 02:20 PM
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That cam looks a little short for 10.5:1 static compression ratio, so yeah, I think I'd retard it some. I'd use a two piece front cover so that I could try 2 degrees, then 4 degrees and see what happens.
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Old 04-05-2009, 09:05 PM
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Words of wisdom I got from the late great Joe Mondello... if you have to advance or retard a cam, you picked the wrong one.

That's a bit absolute, but if you haven't already installed it, I might consider more cam. Why crutch what you have with advance/retard when the right cam would be better.
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Old 04-05-2009, 11:16 PM
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While retarding the cam will shift the power curve up and bias the top end, you won't get the effect you really need by moving this mild hyd cam because it is just too small.
You could easily use a larger hyd cam with 230 to 244 duration @.050".
This would be a much more powerfull match to the car, intake manifold, compression ratio, converter stall and rear gearing.
If this was my car and motor, I would swap to a Isky Z-27 street/strip mechanical cam #201027
282-282-247-247 .507 .507 108 in on 104 .016" .018" lash
Very streetable, cool hot rod idle, strong, strong power from 3000-6500 rpm.
This would be a starting point for this motor.

Last edited by F-BIRD'88; 04-05-2009 at 11:23 PM.
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Old 04-06-2009, 06:21 AM
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Quote:
Originally Posted by curtis73
Words of wisdom I got from the late great Joe Mondello... if you have to advance or retard a cam, you picked the wrong one.

That's a bit absolute, but if you haven't already installed it, I might consider more cam. Why crutch what you have with advance/retard when the right cam would be better.

That's not necesarily true- many cam grinders even spec different amount of cam advance for various conditions. No adv/ret cannot crutch poorly matched suration, but it still does have a place. Using it is not a bad thing, using it to cover up another mistake is.
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Old 04-06-2009, 07:55 AM
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Thanks for the help guys. I really appreciate it
Since the powermax is an awfully small cam, how would the Comp Magnum 280 fit my combo, as i am just going to have fun with it on the streets, I donīt want to go over kill with the camshaft, BUT i would like it to be that big so i would be able to run pump gas, 93 octane.

Best regards

P.s. i find this the best source when it comes to hot rodding, you guys rock

Last edited by monzter; 04-06-2009 at 08:05 AM.
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Old 04-06-2009, 08:01 AM
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The comp 280H is a step in the right direction. But you are leaving performance on the table. The cam I recomended will make a good bit more horsepower, with more rpm capability . It is very "streetable". Its a "street cam". It will run fine in your motor with 93 pump gas. It is by no means overkill for your car and purpose.
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Old 04-06-2009, 08:24 AM
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Thanks for the reply F-Bird, I would like to stay with hydraulic cam, because i have the lifters

I was browsing summit racing and found a cam that might do pretty well for my set-up and it would be grate if i could use 93 octane pump gas.

http://store.summitracing.com/partde...1&autoview=sku

What do you Wizards think of this camshaft ?
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Old 04-06-2009, 08:37 AM
How fast is fast enough?
 
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not a bad match to your combo, but its not a solid, which your combo really needs. hyd. cams do not fair well at higher RPM and it looks like the rest of yoru car is built for higher RPM... I see a problem there.

I'd go with a solid like F'bird suggested. You'll spend about the same on lifters as you will on the gaskets- worth it IMO.
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Old 04-06-2009, 10:43 PM
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Another vote for the solid, you won't be disappointed if you do. In a car like yours... Hydraulic cams are for Girls!
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Old 04-06-2009, 10:59 PM
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over kill will doem in evey time the cam you have will make good power to 5500 rpm id get an rpm air gap intake and back off to 6oo or 6500 cfm carb it will jump horspower 5 or 10 percent to much carb and intake will kill power if you dont think so take both setups to dyno and ill prove you wrong install cam straight up you wont se benefits of retarding cam unless you go too a solid cam and are in the 6000 rpm range befor the true benefits kick in you could get that grind in a 4 7 swap and the change in firing order would help at 3500 to 5000 rpm
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Old 04-07-2009, 08:02 AM
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Quote:
Originally Posted by ap72
That's not necesarily true- many cam grinders even spec different amount of cam advance for various conditions. No adv/ret cannot crutch poorly matched suration, but it still does have a place. Using it is not a bad thing, using it to cover up another mistake is.
Agreed, but the ground-in advance from the manufacturer is not there because its best for the engine, its there because we keep buying too much duration, so they advanced it so we wouldn't be disappointed with the results. We've just grown so accustomed to how to buy duration based on the maker's ICL.

I often will buy the duration I want, find it on a 4* advanced grind, then install it 4* retarded so it ends up straight up.
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Old 04-07-2009, 08:35 AM
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I am going to stay with a girly Hydraulic camshaft, at least for now The lifters i have are from Crane and are supposed to be Anti pump up and Crane says that with proper valve train they can handle 6500-7000 Rpmīs

I was browsing summit AGAIN and found this circle track Isky Mega 288° camshaft, it is pretty wild in duration but the lift is only .450, how would this camshaft suit my combination ? Would i be better of with 278 Mega ( a bit milder ) Or just best set with a good healthy street performance camshaft like the Comp Cams Magnum 280 ?

288 Mega - http://store.summitracing.com/partde...8&autoview=sku

278 Mega - http://store.summitracing.com/partde...8&autoview=sku

280 Magnum - http://store.summitracing.com/partde...2&autoview=sku

As i said i would like to stay with a Hydraulic camshaft. If you guys have other camshafts in mind please let me know.


Best regards
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Old 04-07-2009, 08:56 AM
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need more cam!!

I ran a similar setup, but used the compcam 292H.
ran great! pulled hard to 7,000 rpm.

but you will need to use the right springs which may require some machine work and will require screw in studs.

294S (solid) would also run well.
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Old 04-07-2009, 08:57 AM
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If I had to pick from one of those three, then the 288 Mega and throw some 1.6 rockers on it.

Picking from Isky and hydraulic, I would use the 286 Mega- 286° advertised duration, 240° @ .050 with .500" lift and 106 lobe seperation. More lift than the 288 Mega. I'd probably put 1.6 rockers on this one also.

Is there a reason you are limiting yourself to the Summit catalog? If you like Isky, call them and let them pick a grind based on your info and intended usage. Isky (or any cam company) has far more listings than Summit has the room in their catalog to show.
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