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grey_esp · 01-31-2005, 23:35

Do standard 2V and 4V heads share the same rocker gear? and Valve springs? If not what is the differnce? rocker Ratio? Valve spring pressure?

brenx · 02-01-2005, 17:17

Quote:

Originally Posted by grey_esp

Do standard 2V and 4V heads share the same rocker gear? and Valve springs? If not what is the differnce? rocker Ratio? Valve spring pressure?

yes, I am pretty sure they do. The GT's had slightly heavier springs due to the larger cam but thats it.

Brenden

fat071 · 02-02-2005, 02:17

It all depends if you got a black or blue motor some 351 4vs had ajustable fomoco rockers Im pretty sure it was the black 351 4v that had this style of rockers
Mick

grey_esp · 02-02-2005, 17:04

There were no Black 4V in the falcon range. Were these in the F series?

I was reading an old Tunining guide last night and it stated that some 4Vs 70s and 71s had higher spring pressures than others 75 onward. ANy comments. Im asuming its because the pre pollution cars had bigger cams in them.

4Vman · 02-02-2005, 18:36

Guys,
the rocker gear on standard clevelands regardless of blue (xw to xc) or black (xd/e)blocks is essentially the same (except spring rates) and is NON adjustable, the only adjustable rocker gear on clevelands was on the phase 2 an 3's with solid cams.

grey_esp · 02-02-2005, 19:08

I didnt think they would be adjustable but I had thought that perhaps the Rocker ratio in the 4Vs may have been different to a 2V, in order to get a little more lift, for something like a GT.

fat071 · 02-03-2005, 03:20

I bought a 351 from the wreckars out of a xb gs coupe and it had the rocker gear that i was talking about the cam is large id say around 580/600 thou lift peek rev around 6800 rpm a realy good street engine

grey_esp · 02-03-2005, 16:40

I think you just got lucky. Definatley not standard gear there.
I was just looking for a cheap alternative to upgrade my valve train. Dont need rollers, as I wont be reving that high, just wanted a good tough street engine, that is very reliable.

clevo400 · 02-03-2005, 18:19

Quote:

Originally Posted by grey_esp

Do standard 2V and 4V heads share the same rocker gear? and Valve springs? If not what is the differnce? rocker Ratio? Valve spring pressure?

All 2V and 4V heads should be the same specs except for the Oz 4V GT Closed Chamber heads which should have a 4 and a dot on the heads. I was told the dot meant they were machined for screw in studs and guide plates for the solid cam setup !!! I think the 4V Oz GT heads had around 120lb at the seat.
All Clevo heads have a 1.73:1 rocker ratio but the standard springs were around 85lb closed. I think the 4V Oz GT heads were just 70, 71 and 72 American Mustang Boss heads imported for Bathurst and shoved onto the Phase 3 and 4 and some lucky XA GTs and even some XBs.
Thats what I think anyway. I will c if I an post some pics of my 4V heads !!!

clevo400 · 02-03-2005, 18:23

Quote:

Originally Posted by grey_esp

I was just looking for a cheap alternative to upgrade my valve train. Dont need rollers, as I wont be reving that high, just wanted a good tough street engine, that is very reliable.

Try Performance Valve Springs CLBB1 springs which r single with damper and 120lb seat and around 0.550" max lift. Good for cams up to 230 dur @ 0.050". Must buy new steel retainers and collets while ur there. Standard rockers with better push rods. All should be fine to 5500 rpm where a Streeter should rev to.