cruzn57

I had the same set of heads (not pro comp LS heads)
flowed on 2 different flow benches,and were over 25 cfm diffferent
on intake and ex ports.
so to see a difference from what is advertised, is no surprise.
I have a friend ( here is goes) who has run the pro comp LS head, right out of the box, instant 50+ HP increase, nothing else changed.

ls1 down under

Agreed that you probably wouldn't put something cheap on a race car but for a budget street driven car with street sized camshafts it suits me. Besides my tv, fridge , 3d blu ray player, stereo head and speakers are all made in china and they are all fine

ls1 down under

I've heard the same too bud! There's as much a good story as there is a bad story with anything. Hell, I've paid top dollar for high end products for them to end up not being what you paid for. It's what suits the individual at the end of the day. I've heard many times NEVER re use gm tty head bolts and I thought well why not try that theory and see what happens, so I re used gm tty head bolts that had been on a car for 8 years.......ported 241's milled 30 thou with .45 head gaskets.....5 years later and not a single issue at all. Call it luck, maybe, but each to their own. My car currently makes 360rwhp with btr stage 2 cam, those pro comp heads will be installed in the upcoming weeks so will see how much of a gain they give. If they give a decent gain and last me 5 years, money well worth spent IMO.

.boB

iTrader: (1)

This is exactly right. If your cheap chinese spring retainer fails at 5,000 rpm's, bad things will happen. The little bit of money you "saved" goes right out the tail pipe.

Your asian TV as invented and developed in Asia. Your cheap chinese knock off performance part was invented and developed in America, and then copied. IMO, that's stealing. We make a big deal in theis country about downloading free music. But then we flock to stolen car parts.

ls1 down under

That all good and said but I'm Australian so either way American or Chinese the $ ain't staying in Australia :-) plus I bought BARE not complete. I'm using Brian tooley platinum spring kit and Ferrera valves.

cruzn57

when you get them on,
interested in the results.

Cwarta

iTrader: (12)

454/425 on my h/c 6.0 thrue irs and 3:91's

cruzn57

difference between then and now?

chikn305

iTrader: (8)

I put a set of these one a ls2 vette with btr springs and btr stage 4 cam. The car has ran 128mph in the 1/4 on street tires. Hopefully we will find out what it will run on some good tires

Cwarta

iTrader: (12)

I now have a 13.5:1 compression 416 these are going on this week, car made 505/490 thrue stock ls6 heads. I now have these cnc pro comps all new guides, new vj, decked .065, hand ported and hoping for ATLEAST 550rwhp. My old cam was a 241/255 .624/.634 on a 110+4 and as said made 505/490 and 400rwtq by 2200rpm.

New cam is a 255/266 .624/.598 on a 109+3 running rectangle single plane and 4500 dominator tb.

My gto is a solid axle 9" with 4:11's so that may sap my power numbers some.

ls1 down under

Went and checked out the heads at the cylinder head shop today. Paul is a master with heads in my neck of the woods. First thing he said was "Jesus Christ they done a terrible job with these heads".

However, without a valve job and being bare heads, he said there's plenty of room for improvement.

Paul said that none of the ports were the same size so first thing he done was to make them all the exact same size. Then he plunge cut valve seats and done a three angle valve job with Stainless Pep-pro elite valves (Aussie made since 1985) being used.

Tomorrow Paul is going to hand blend the CNC port work and then will flow the heads once done.

Will post pics and flow results as soon as Paul's flowed heads.

The heads will be fitted to car next week

.boB

iTrader: (1)

These heads are sounding less and less like a bargain by the minute. Yu get what you pay for -If you're lucky.

A set of Dart heads are more expensive. But you just clean them and install, right out of the box.

ls1 down under

Bob I did look at the dart pro 1 as casts which for a blemish pair u can get for only $800 bare (cheap) but I didn't get them as dart are on almost every head and cammed ls1 in Australia so I opted to be different.
Honestly I would certainly NOT recommend anyone else buying 3017 procomp/speedmaster CNC heads at all. Yes they are crap in reality - I totally agree. And in no way do I defend procomp for making such bad quality inconsistent heads.
But as for out of the box , my last set of heads were TSP CNC ported 241's which were a lot more expensive and I still did not install them right out of the box. I sent them to my head guy who flowed them and he still managed to improve them more and he does to suit my cam specs.
I budget for $2000 all up for complete heads whether they are standard cast 243 and then ported or if they were TEA's.
and the last 3 sets I have had have all been $1900-2000.

So as long as these procomp ones end up flowing as good as the last 2 sets, I'm happy with that.

Just don't buy procomp if u want something straight out of the box and don't want to spend more $$ making them decent. PC3017 is the part number to stay clear of!!!!

cruzn57

some will bash it , forever.
buy like your finding out, even the hi $$ heads aren't perfect.

CBM Motorsports

iTrader: (2)

We have used these heads many times but not in stock form. We use different guides, valves, springs, and of course, a different CNC program. The head casting itself is great. Nice and thick where it needs to be. Here are our flow numbers after our port job.

Lift In Ex
.100 72 57
.200 148 113
.300 203 155
.400 261 195
.500 301 213
.600 321 219
.650 321 223
.700 306 224

Cwarta

iTrader: (12)

Are those cathedral or rectangle port flow #'s?

CBM Motorsports

iTrader: (2)

Cathedral. Our LS3 stlye heads flow a lot more across the whole board.

Cwarta

iTrader: (12)

Agh very nice, i. The gen 3 section someone posted flow numbers for rec pro comps and yours flow mbe tree down low but up top tgey outflow these by a lot. But since it's ls3 vs cathedral that makes sense . Can you tell me what size guides your ks3 pro comps come with? 5/16 or 11/32?

ls1 down under

Wow! Those numbers are good and u give me some hope with the end result of my pro comps. If I can get 260cfm @ 400 lift ill be satisfied. I will be picking them up Tuesday so will post up flow sheet same night.

JoeNova

The butchered set above doesn't look like any of the pro-comp CNC heads I've seen. Those look like used hand-ported heads that someone tried to pass off as something else.

All of the Pro-Comp heads I've seen locally had a full CNC port, not a casting clean-up.