Aftermarket Performance 2F Cams (1 Viewer)

[Mark W]

When you say late model Aisan, what years are we talking?

I have a '78...

I have had best results with the '80 and newer carbs. But I believe Jim C considers anything from '78 up to be pretty much identical in terms of performance. He's more up on the exact details of these carbs than I am. I certainly can not give you any specific reason why the '78 woulod not work as well as a later one.


Mark...

 

[Degnol]

I have not had a problem fitting it to any header. I always am prepared to have to shave and fit the ears of a manifold and a header to make sure they work together. Yiu don't always have to, but you always have to be readu to. No big deal. I have not had any more trouble with this intake than with any other.


Mark...

Mark, thanks for the reply to a hijack. I have the SOR 2-piece and the flange thickness is the same as a 2F intake. It just looked like the thicker runners might interfere with a couple of the tubes on the header, specifically the #2 and #5. I'll try it anyway as I have both manifolds.

Ed

 

[Mark W]

Mark, thanks for the reply to a hijack. I have the SOR 2-piece and the flange thickness is the same as a 2F intake. It just looked like the thicker runners might interfere with a couple of the tubes on the header, specifically the #2 and #5. I'll try it anyway as I have both manifolds.

Ed

I have used this header a few times, with the original maifold, with the Offy Dualport and the Offy C series. No fitting issues. We have used the large runner Toyota intake with two or three different 6 into one headers and had no problems. But I don't remember combining the 2 piece SOR header with the larger runner manifold. May have, but I don't recall right now.


Mark...

 

[Roadnoiz40]

Racer Brown Cams. Not just for Mopars. He ground an FJ40 2F camshaft for the 6 cylinder Toyota engine. A variable lift mech cam. At half the cost of the $$ Man-A-Fre cam. Company: Racer Brown
Contact: Jim Doyle
Phone Number: 410-866-7660

 

[Degnol]

I have used this header a few times, with the original maifold, with the Offy Dualport and the Offy C series. No fitting issues. We have used the large runner Toyota intake with two or three different 6 into one headers and had no problems. But I don't remember combining the 2 piece SOR header with the larger runner manifold. May have, but I don't recall right now.


Mark...

Then I'll be the guinea pig.
BTW, what do you think about clearancing the manifold to match the gasket? as in porting the manifold, not the head?
Thanks, Mark, for the reply.

Ed

 

[Mark W]

If you match the intake to the gasket, you will want to do the same to the head. If the mouth of the intake is larger than the opening in the head, it will produce some significant disturbance to the flow when the air fuel charge its the "lip".

Matching the ports is a good thing.


Mark...

 

[jmaddox]

Regarding the discussion about valve springs, I installed OEM springs (because Downey could not provide the springs they advertised with their camshafts) but they bottomed out when the engine was rotated. I guess there was more lift in the cam than expected. Anyway, the machine shop got me some "performance" springs that seem to be able to handle the cam.

I will update on the performance when I get the engine running. The starter was smoking when we tried to turn her over so I have a new one coming tomorrow. I hope that works.

 

[RUSH55]

What were the "performance" springs, i.e. who makes them and what kind of pressures are they rated?

 

[Mark W]

Regarding the discussion about valve springs, I installed OEM springs (because Downey could not provide the springs they advertised with their camshafts) but they bottomed out when the engine was rotated. I guess there was more lift in the cam than expected. Anyway, the machine shop got me some "performance" springs that seem to be able to handle the cam.

I have never needed to change springs. You may have still had shims under your springs. Often as springs age they loose some of their strength. One way to maintain seat pressure is to shim the spring. This keeps the pressure up to spec, but it effectively shortens the range of movement of the spring. Not a problem with stock cams, but it can be with a higher lift.

Good condition factory springs with no shims under them will work fine for all of the cans I have found for the F/2F/3F engines.


Mark...

 

[PabloCruise]

...This cam also works very well with a late model Aisan on top of the large runner facgtory manifold (if you can find on). VERY well.



Mark...

Continuing on the discussion of matching induction/exhaust to cams; if one cannot find a large runner factory manifold, are there mods I can make to intake to help things out?

I like the Aisan vs. a 4 barrel (never hear about anything performing off-camber better than an Aisan) but wouldn't mind opening things up a bit...

 

[Mark W]

Well, there's still port matching. But I doubt that you will see much (if any) seat of the pants improvement from that alone.


Mark...

 

[PabloCruise]

So the large runner manifold is worth getting (if you can find it)?

Or should I just give in and stick a 3FE head on a 2F?

 

[jmaddox]

What were the "performance" springs, i.e. who makes them and what kind of pressures are they rated?

The springs are Comp Cams 981-16

Here are the specs -

Outside Diameter of Outer Spring (in): 1.254
Coil Bind Height (in): 1.150
Damper Spring Included: Yes
Spring Rate (lbs/in): 417
Inside Diameter of Outer Spring (in): 0.880
Inside Diameter of Inner Spring (in): 0.820

I finally got to sart her up today and I threw the seats back in for a short test drive. It ran great and seems to have good throttle response and more torque but I did not get to test it thoroughly. More to follow...

 

[jmaddox]

I have never needed to change springs. You may have still had shims under your springs. Often as springs age they loose some of their strength. One way to maintain seat pressure is to shim the spring. This keeps the pressure up to spec, but it effectively shortens the range of movement of the spring. Not a problem with stock cams, but it can be with a higher lift.

Good condition factory springs with no shims under them will work fine for all of the cans I have found for the F/2F/3F engines.


Mark...

I am not really sure if the shims were in or not. Teh machine shop assembled it for me. I gave them new OEM springs.

Unfortunately, I am still learning and have to trust others when it comes to more advanced engine work. Sometimes I wish I still lived in Big Lake and could just bring it to you.

 

[4x4Poet]

A few questions:

1. Aren't regrind cams weaker than stock cams from having less material left after machining?
2. What about new cast cams for 2Fs? (Aftermarket or stock)
3. Aren't there billet cams available for 2Fs?
4. Doesn't UPnOver still offer cams for 2Fs? Or were they just for TBI EFI conversions in terms of specs?

 

[Mark W]

Cams don't break. "Weaker" is not an issue. Regrinds do have smaller base circles and so put more stress on the lobes and the lifter faces. But that is largely a theoritical concern in an engine like a 2F

There are aftermarket cams available that are made new as opposed to regrinds.


Mark...

 

[PabloCruise]

Back to cams; are the 2F and 3FE cams different?

If so, what profile performs more favorably in 2F, 40, mix of trail and street?

Second question, can anyone rate the following induction choices in order from best to worst:

1- 3FE set up
2- 2F factory large runner manifold
3- 2F fed spec manifold ('78)

 

[Degnol]

Pablo, I don't think there is such a thing as a "2F large runner intake". It will work on a 2F with maybe a little enlarging of the holes for the studs as I think they are 1mm larger on the 2F. The manifold called the Hi-Po or large runner came only on the '68-'69? F engines.
I stand to be corrected on this by someone more knowlegable, though.

Ed

 

[PabloCruise]

Oh! So it is a F large runner intake... Glad to learn! Thanks!

 

[Pin_Head]

The best performance cam for a Cruiser is a Chevy Vortec cam. Of course, you will have to install the matching assessories, like the Vortec engine. Power you can feel!

D'oh, I could have had a V8