PROCOMP HEADS ------ STICKY------

Agreed Charlie and Richter..

The procomp exhaust port is actually quite good when properly ported and only when properly ported.

The intake geometry and flow bias suck as cast and can be improved with careful reshaping of the intake port roof, guide trenches and short turn crest. I have managed 360 cfm and more.

The issue is still quality of intake flow and an absolutely terrible combustion chamber design.

A fully worked pair of p/c castings against a good but not max effort pair of not mine Doves was marginally faster with the reduced static c/r of the larger chamber. Add the additional power that the c/r would bring and they are still woefully short of the other aluminum offerings.

so, is the compression chamber just to big, ??? or do you mean the shape of the chamber is bad ??

jc10000rpm wrote:so, is the compression chamber just to big, ??? or do you mean the shape of the chamber is bad ??

The chamber just LOOKS pretty awfull because it doesn't have a consistant circular outside shape to it; (like a bunch of connected short flat walls which doesn't adversely affect anything but is not very pleasing to the eye).

i have no experience with procomp ford heads but have seen horrible casting problems with chev smallblock heads. The chev blocks are no better either with problems in the main cap areas.

Where's the procomp hero Jeremiah?

richter69 wrote:

Maddmattmustangs wrote:Where's the procomp hero Jeremiah?

You cant use ProComp and HeRo in the same paragraph.............

procrap ZeRo

richter69 wrote:

Maddmattmustangs wrote:Where's the procomp hero Jeremiah?

You cant use ProComp and HeRo in the same paragraph.............

My bad

come on guys lets keep this as technical a possible

thxs
Nick Bruno

richter69 wrote:

bruno wrote:come on guys lets keep this as technical a possible

thxs
Nick Bruno

aint much technical in a procomp product..........

I've heard that on there bare castings the valve guides need honing or complete re machining in most instances. Also the valve seats are recessed far into the port messing with the short turn.

Valves in there assembled heads tend to have wide variations in stem diameter. Widest I've heard of being .060 over what's promoted. The bronze they use also has proven to be weaker than the standard.

Maddmattmustangs wrote:

richter69 wrote:

bruno wrote:come on guys lets keep this as technical a possible

thxs
Nick Bruno

aint much technical in a procomp product..........

I've heard that on there bare castings the valve guides need honing or complete re machining in most instances. Also the valve seats are recessed far into the port messing with the short turn.

Valves in there assembled heads tend to have wide variations in stem diameter. Widest I've heard of being .060 over what's promoted. The bronze they use also has proven to be weaker than the standard.

Getting the ASSEMBLED heads directly from ProComp is certainly not a good idea.
If anything, the seats are to tall in a BARE casting because a valve job is NOT done to them and that makes for GOOD reshaping possibilities. AND, there are NO valves in a BARE casting.
"Proven" bad bronze...??? I haven't seen it in the over 50 pair I've finished with good hardware. Having bad guide clearance set-up will eat-up anybodies bronze guides.

The "I've heard", my "buddy told me" and a "friend of a friend knows", shouldn't be construed as GOOD information; What you have actually witnessed and done yourself is all that should be discussed here.

Has anyone come up with a CNC program to correct the flaws in the chambers and ports?