which cam

[923.4v6]

http://store.summitracing.com/egnsearch.asp?N=700+4294908216+4294908198+4294924760+4294840048+4294925232+115+4294887637

[ezrollin]

GMcratemotors.com has the 3.4 cam for $116 but don't see the springs or retainers listed.

[1986]

Crane makes those cams for gm but personaly I don't like Crane I'm a Comp man

whats wrong with crane? is it just your personal prefrence or you've had bad experinces?

[923.4v6]

Just my personal prefrence I've owned a 60* cam and a v-8 and didn't like neither one. Owned a comp x-trem energy for a v-8 and loved it

[Superdave]

Comp's 260 cam is a single pattern, you'd usually only run a single pattern is your exhaust ports flow more than 80% of the intake ports.. which isn't the case on iron heads.

I had a Comp roller cam in my T/A and i was never impressed, the fuel pump lobe wiped off while using a stock pump and it deffenetly never performed like they promised. 240 WHP/320 TQ with their $1100 retro fit roller setup, headers, single plane intake, 750 carb and some light headwork.

[923.4v6]

[QUOTE=Superdave;358606]Comp's 260 cam is a single pattern, you'd usually only run a single pattern is your exhaust ports flow more than 80% of the intake ports.

so would you want to buy a cam to keep the cfm's at 80% flow (if you know the flow numbers of your heads)?

[92_lumina]

crane 272. good power, great economy and sounds like a lumpy cam. easy fo tuning

how are going about the 4.3 setup? just using the 4.3 tb with injector? most of the 90 degree v6 parts are not interchangable. are you fabricating?

I thought the 3.4 camaro's were roller engines?

[bszopi]

Nope, the only roller engines are the 93+ aluminum head engines (3100, 3400, etc).

[toy60]

I'm basicly doing the same thing to my 3.4 with a 700r4 in a Toyota 4x4 and I talked to Mark Engle of Engle Cams yesterday about their cam 21640-H that has 215 @ .050 and.453 in and .471 ex with 112. He said there would be no lope in the 60 degree motor. I have always thought that when you get past 210 degrees @ .050 on the intake side that you can expect to get some lope.SoI'm not sure what cam I going to use.

[1986]

anyone ever used isky?

[latemodelnewbee]

I have used an edelbrock torker (or torker 2) cam in a carb. 2.8L. It sounded mean, like 3 harleys idling. It was in an 84 cherokee chief with the edlbrock 4 barrel intake and 600cfm carb, with 3.55 gears and a T5 tranny it would smoke all four 31" mudterrains. But I don't how it would work with the fuel injection

[Superdave]

Comp's 260 cam is a single pattern, you'd usually only run a single pattern is your exhaust ports flow more than 80% of the intake ports.

so would you want to buy a cam to keep the cfm's at 80% flow (if you know the flow numbers of your heads)?

Yep.. or better.

If you look at the specs for the Crane H260-2 VS the Comp 260 you'll see it..


Comp 260

Advertised duration 260in/260ex
Lift w/1.5 rocker .440in/.440ex


Crane 260

Advertised duration 260in/272ex
lift w/1.5 rocker .427in/.454ex

you can tell that Crane actually looked at the flow numbers of the heads (probably the iron heads) and figured out what would be best.

the Comp 260 would work ok if you were using the aluminium gen3 heads because port flow is so much better on those.. still not much of a cam by todays standards.

[powerdoctor]

Before I would recomend something, I would want to know what you are using this truck for?
Is it a 4x4?, 2 wheel drive?

If you are playing in the mud, you would want a wide lobe sep cam for increased low end power.
If you are racing it, then tighten it to 108/105 lobe sep.

If you are wanting this to be a "daily driver" just put the 3.4 lower in and be happy.
If you put the bigger tb on it you will need to add headers at least.

Really your power will come from compression.
The 3.4 with the 2.8 heads will more than accomplish this "bump" in compression due to bore and stroke differences.

Do not mill the heads unless you need to, you will need to "mill" the intake to match the heads at this point if you do.

Timing will be your other issue, but you have a distributor so this will be realitvly easy.
About 20.0/ 23.5 degrees at IDLE will be a good "curve" for the tb s-10.

Roller rockers, roller chain, ect... for freeing up H.P.

As A final note, DO NOT grind off the "bumps" in the intake ports of the heads.
These are not emission devices, they are actually venturi that help "bend" the intake charge into the cylinder and equate to a 17% increase in airflow over removing them.
Also do not "polish" the intake side of the heads, this will mess with atomization, and cause "pooling" of the fuel in the runners.

If you need to know more e-mail me.

[923.4v6]

The 3.4,3.1, and 2.8 all have the same heads so no compresssion change will happen. The carburator heads has smaller valves.

[923.4v6]

Yep.. or better.

If you look at the specs for the Crane H260-2 VS the Comp 260 you'll see it..


Comp 260

Advertised duration 260in/260ex
Lift w/1.5 rocker .440in/.440ex


Crane 260

Advertised duration 260in/272ex
lift w/1.5 rocker .427in/.454ex

you can tell that Crane actually looked at the flow numbers of the heads (probably the iron heads) and figured out what would be best.

the Comp 260 would work ok if you were using the aluminium gen3 heads because port flow is so much better on those.. still not much of a cam by todays standards.

do you know what the perfert % flow would be between the intake and exhaust