still debating wich cam to use to go in my truck ( 1989 F150 reg cab 5 speed short box ) with the new 5.0HO carbed engine

the E303 cam ( notes : not good for a truck )

the 35-422-8 Comp Cam ( notes : too much lift needs new PR and few other things)

The COMP Cams 35-421-8 ( PErfect duration PErfect LIft) but notes says : FOR ENGINES THAT DID NOT COME FROM FACTORY WITH ROLLER CAM


this cam the 35-349-8 (is perfect !!!! ) but not for Carbed engines
LSA need to be lower fr CArbed engine ( a comp cam tech told me that )

 

I am both capable and willing to help you select a cam, but PLEASE don't make ME go find catalogs and look up specs!

Get the intake and exhaust duration @ .050 numbers along with the lobe center angle. Post that info here and I will help you. I am headed out for a wedding shortly, but I expect to be back online late tonight or in the morning.

 

FordRacing E cam
Intake Duration at 050 inch Lift: 220
Exhaust Duration at 050 inch Lift: 220
Duration at 050 inch Lift: 220 int./220 exh.
Advertised Intake Duration: 282
Advertised Exhaust Duration: 282
Advertised Duration: 282 int./282 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.498 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.498 in.
Valve Lift with Factory Rocker Arm Ratio: 0.498 int./0.498 exh. lift
Lobe Separation (degrees): 110


COMP Cams 35-421-8

Intake Duration at 050 inch Lift: 218
Exhaust Duration at 050 inch Lift: 224
Duration at 050 inch Lift: 218 int./224 exh.
Advertised Intake Duration: 270
Advertised Exhaust Duration: 276
Advertised Duration: 270 int./276 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.513 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.513 in.
Valve Lift with Factory Rocker Arm Ratio: 0.513 int./0.513 exh. lift
Lobe Separation (degrees): 110


I LIKE THIS ONE THE MOST if you say it will work fine with a carbed engine ill get it..
COMP Cams 35-349-8
Basic Operating RPM Range: 1,500-5,500
Intake Duration at 050 inch Lift: 212
Exhaust Duration at 050 inch Lift: 218
Duration at 050 inch Lift: 212 int./218 exh.
Advertised Intake Duration: 264
Advertised Exhaust Duration: 270
Advertised Duration: 264 int./270 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.512 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.512 in.
Valve Lift with Factory Rocker Arm Ratio: 0.512 int./0.512 exh. lift
Lobe Separation (degrees): 114

 

#3 would be my pick.

 

why is that?

 

Okay great. These look like good possible selections, but I need still more info. The info I need is:

What gear ratio?
What tire size?
What transmission?
What will you be using the truck for, towing, stop light to stop light?
Tell me about your exhaust system, stock? dual exhaust? Headers?

 

Ok thanks!

4.10's
26's tires

C6 trans

daily driver, i dont depend on it everyday normally i walk to school i only use it to go to the gym and stuff, and some weekend fun, drags, show, etc etc

headers going into 2 electric exhaust cut outs, when closed its giong into a single Borla muffler

 

Have you checked into this? COMP Cams 35-000-8 - COMP Cams Custom Ground Camshaft Cores - summitracing.com

 

hmm not a bad idea.. but i dunno wich lift and duration i would want..

 

I would give my info and intentions of use to a comp tech and let him give you an idea. I think the lift and dur. figures on the other cam are pretty good, but this might allow you to run a diff. LSA. I'm not sure why the comp tech told you you needed a smaller LSA to start with, though. I think that the comp. needs the LSA of 114. If it weren't for the comp. compatable thing, your cam choices would be a lot broader. What was the original set -up that you are replacing with this motor?

 

jepp i was thinking more of the line about

270 Duration in. & ex and about 0.512 list with 110 LSA

this engine is brand new stock 1996 5.0HO explorer GT40 heads.. that im going to swap into an 1989 F150

or the E cam ? dunno it has good duration 281 Int & ex. and 110LSA with 0.498 of lift..

 

ahh thats it im going with the E cam!!!

 

I think that's a mistake for your usage. That's just too much cam, plus it is a symmetrical grind. Unless you have headers and a VERY free flowing exhaust, you would benefit from more duration and lift on the exhaust side. Most Ford engines respond well to this, especially with a restrictive exhaust system.

I would recommend the Comp 35-349-8. It won't have too much intake duration and the extra exhaust will work well. Remember, this is a relatively small displacement engine. If it had more cubes, specifically with more stroke, you could get by with 220 @ .050, but it will just not have enough on the low end for your purposes.

The most common mistake in cam selection is giving into too much cam. The thinking is typically; "if a little bit is good then a bunch must be better."

Don't get carried away. You will regret it. If you insist on more cam, go with the other Comp cam with the split duration.

 

well buddy thanks!! thats what i will get for my engine then! thanks a bunch! it will work fine with the Carb right? all the LSA mambo jambo ?

i will use the recomended springs and retainers but do i need new pushrods?

 

I have the E-cam in my 88 5.0 Mustang. It makes good power from 2500 to about 6000rpm. Not really good for the heavy truck.
Go here and fill out the info and get the recommendation from the experts!!!
Online Cam Help