Pushrods and rockers for my 2332 - few questions

[jaqo]

Hello
I'm changing the heads on the 2332, that's going to my fiat. I have some new comp eliminator heads with 48x40 valves that are equipped with double springs that I know nothing about - they came with those heads. I wonder if my pushrods - manton 3/8 x 0.035'' - will be strong enough or should I buy the 0.058'' ones? The cam is SCAT c65 and  lets say that I'm planning to use a 1.5 pauter rockers.

The other question is what rockers should I use? I have 2 sets at my disposal - 1.4 scats and 1.5 pauters?
Engine spec is: 94x84 with a lightened flywheel, balanced etc, scat c65 cam, comp eliminators 48x40, 48 IDAs with short manifolds. I'll think about the exhaust when I will be sure about final engine spec

You can see those springs here:

[John Rayburn]

The C65 is for a stock ratio rocker arm.

[jaqo]

The C65 is for a stock ratio rocker arm.

Hmm quoting the scat's page "GRINDS FOR 1.25:1 & 1.40:1 ROCKERS"
So I'm confused now. Not sure if I want to open this engine but maybe... what cam would work good there?

[John Rayburn]

That's interesting, when I ran a C 65 years ago, Scat stated it was for stock ratios only. Unless they changed it, it was very close to an Engle 140. I hope they did change it, I hated that cam.

[jaqo]

Ok but what about the pushrods?

[K-Roc]

Hi, by the looks of it your heads have the K800 springs ( the stripe ) you will Pretzel the thin wall pushrods instantly with those springs. I would at the minimum use the thick wall cro-moly or better yet go for the dual taper ones (even less flex )
I agree with John, ditch that cam and go with a proper ratio rocker cam, 86C, FK87, or FK89 perhaps.
For the rockers I would choose the ones that give you the final lift you want and best geometry, the only way to know that is to trial assemble the top end with the 2 rocker assemblys and see which one will work the best.
Remember that the older Scat rockers listed as 1.4 ratio actually lift to 1.5 or better.

Cheers, K-Roc,

[neil68]

I ran the 0.035" Manton's for a couple years and then started to notice some slight bending on a couple pushrods, as I increased HP from 131 to 169 to 180.  Switched to 0.058"-wall and no more problems.

Then I had to swap to different valve adjusters temporarily, which required using the old 0.035's again (it's all that I had availalble at the time) and sure enough a couple more pushrods bent!!  I've stayed with 0.058" Manton's since then with no problems...

[jaqo]

thanks!
I have one fk89 on the shelf so maybe I should use it? Taking the engine apart is not a problem now.

[jaqo]

Ok so I followed your advice and changed the cam for fk89. At the same time we swapped the crank for a scat pro-comp and put some longer rods in. We'll see what will come out of it. Fiat weights ~600kg so it should be fast.
Trial assembly for deck height measurements:

[Mike Lawless]

That cam will work very well with those heads. However, do yourself a favor and make sure you don't run into coil bind. I have the same combo and the Pauter rockers lift closer to a 1.6 ratio which is good because it really wakes the heads up. This will put your lift in the .640-.670" range. You will need 1.800" installed height. You'll also need piston notches around .200" deep

[jaqo]

Thanks, I'll check it out. What is your engine spec and how much power does it produce?
[EDIT] ok I saw your page.

[Chris bugster]

Checked the cam timing etc. and the specs came out like this.
Cam lift 0.395
Lift at valve .595 with Pauter 1.5 and 0.555 with Scat 1.4s so I will go with the Pauter ones.
With the gear on the cam at 0 got the intake to spec with the cam card but the exhaust was 2 degrees off- can't remember which way though.

Wished for a bit more lift, but at least no coil bind issues