| PROCOMP CYLINDER HEAD DYNO TEST. By the Boat store 11/18/07 |
These are the Dyno results we got when we tested a set of pro comp as cast 64cc chamber, 190cc runner. We selected
this head because of there published flow numbers. (see below) Our test engine was a 377ci. Stroker SB Chevy 9.25:1Cr,
750 edelbrock Carb. We started out with a small cam shaft 488/495 lift, 212/218@ .005. This should have been a good
combo to get us close to 400hp. However, as hard as we tried, we could not make more than 338hp. from the motor. Our
next step was to do a cam change. (thinking we might have been a little conservative on the cam) We stepped the cam
up to 503/510 224/230@ .005, we retested the engine, and did pick up 20hp, (still far short of our 400hp goal) out of pure
frustration,and after doing pull after pull after pull, with different carbs and timing , etc. We decided to change the
heads, (I was reluctant to do this, because of the flow numbers procomp heads claim, and why waste time putting on
stock cast iron heads, but we had to find out what was wrong) we had a set of vortec, cast iron 1 ton pickup truck heads
in a pile. (1.94/1.50 valves) we milled the heads down to the same CC (no valve job) as our pro comp heads, and changed
the valve springs for a roller cam. We did not have a correct set of push rods for these heads, so we had to use our +.150
and +.100 push rods. We also could not use the SS roller rockers that we had on the procomp heads, so we had to use
stamped steel, stock rockers. We get the heads on and set the engine up the same way we tested the procomp heads,
warmed the engine up and did our first (and only pull) "WOW" we made 32hp and 10 lbft more with a set of stock gm
cast iron vortec heads!!! We now know where the problem lies. Now we get on the phone to procomp, (speak with Jay) he
was very apologetic and agreed to send us a set of 64cc. Chamber 195cc runner CNC'd heads no charge (he said we must
have got a bad casting "BS") he also agreed to send a set of 210s for testing. We paid the $185.00 shipping charge and
got our replacement heads. Here is where it gets real interesting. After inspecting and CC'ing the heads we were
shocked!! The heads that should have been 195CC's were 216CC's (they said sorry we shipped the wrong ones) the set
that should have been 210cc's were 213 (not to bad). Now to the chambers of these 64cc heads (shaking my head) they
were anywhere from "67cc's to over 70cc's"(.060 needed to be remove just to get close) upon further inspection we
notice the spark plug hole location (see pictures below) the hole is over 1/2" to low down the chamber. Now we will move
on to the valve seats of the procomp "cnc" cylinder head. (JOKE) On Every valve seat, "closest to the spark plug
hole", the seat was machined right out of the head. When they cnc'd (if thats what you want to call it) the chamber,
they cut the seat right out. This was not a mistake on one set of heads, both sets had the same problem.
(did I mention we spent $2000.00 on custom inconel valves and push rods for these junk procomp heads)
Now I have to call procomp again, and speak to Jay, Jay was not in (I might add that Jay did try to help us) so I spoke to
this CLOWN named Carlos, I had one simple question for "Carlos" it was about a casting #, and we got into it, (I was
going to call back for Jay later and I did) he said (Carlos the clown) I was wrong, and people are making 700hp with
these procomp cylinder heads. I asked him to give me the name of "ONE" person making 700hp with a procomp head!
To my surprise he did, and he gave me his phone number. I hung up on him, (pissed) and called the name and number
he gave me. (Thunder chicken was the co.) I called Thunder chicken, and the owner told me, "CARLOS was CRAZY".
Not only has he never made 700hp with a procomp head, but he has not built an engine in over a year, and can't get rid
of the 2 sets of procomp heads he has in stock. I then called Jay at procomp heads and spoke to him, I told Jay about
the problem with "Carlos the clown" and the phone call I made to thunder chicken, then told him of the problems with
the "CNC'D" heads he sent me. At this point I asked Jay if he had a set of CNC heads on the shelf, in stock, that he
could look at, at the same time I was, so I could explain the problems to him, as he looked at the head. He said he did,
he got a head, and we went over the MANY problems, "HE AGREED" they were a mess!! Then for some unexplained
reason, he got mad at me for calling them junk? After he said he saw the problems! (go figure)
Our conversation was OVER!
These procomp heads may look good, but valves should not seat on aluminum, and the heads should make power, NOT
ROB IT!
Now we buy 2 sets of BRODIX IK 180's, as cast. WOOOW!
(We can't use the same valves or push rods with the brodix, another $2000.00+ out the window)
To be continued: just getting started the procomp head is JUNK!
this head because of there published flow numbers. (see below) Our test engine was a 377ci. Stroker SB Chevy 9.25:1Cr,
750 edelbrock Carb. We started out with a small cam shaft 488/495 lift, 212/218@ .005. This should have been a good
combo to get us close to 400hp. However, as hard as we tried, we could not make more than 338hp. from the motor. Our
next step was to do a cam change. (thinking we might have been a little conservative on the cam) We stepped the cam
up to 503/510 224/230@ .005, we retested the engine, and did pick up 20hp, (still far short of our 400hp goal) out of pure
frustration,and after doing pull after pull after pull, with different carbs and timing , etc. We decided to change the
heads, (I was reluctant to do this, because of the flow numbers procomp heads claim, and why waste time putting on
stock cast iron heads, but we had to find out what was wrong) we had a set of vortec, cast iron 1 ton pickup truck heads
in a pile. (1.94/1.50 valves) we milled the heads down to the same CC (no valve job) as our pro comp heads, and changed
the valve springs for a roller cam. We did not have a correct set of push rods for these heads, so we had to use our +.150
and +.100 push rods. We also could not use the SS roller rockers that we had on the procomp heads, so we had to use
stamped steel, stock rockers. We get the heads on and set the engine up the same way we tested the procomp heads,
warmed the engine up and did our first (and only pull) "WOW" we made 32hp and 10 lbft more with a set of stock gm
cast iron vortec heads!!! We now know where the problem lies. Now we get on the phone to procomp, (speak with Jay) he
was very apologetic and agreed to send us a set of 64cc. Chamber 195cc runner CNC'd heads no charge (he said we must
have got a bad casting "BS") he also agreed to send a set of 210s for testing. We paid the $185.00 shipping charge and
got our replacement heads. Here is where it gets real interesting. After inspecting and CC'ing the heads we were
shocked!! The heads that should have been 195CC's were 216CC's (they said sorry we shipped the wrong ones) the set
that should have been 210cc's were 213 (not to bad). Now to the chambers of these 64cc heads (shaking my head) they
were anywhere from "67cc's to over 70cc's"(.060 needed to be remove just to get close) upon further inspection we
notice the spark plug hole location (see pictures below) the hole is over 1/2" to low down the chamber. Now we will move
on to the valve seats of the procomp "cnc" cylinder head. (JOKE) On Every valve seat, "closest to the spark plug
hole", the seat was machined right out of the head. When they cnc'd (if thats what you want to call it) the chamber,
they cut the seat right out. This was not a mistake on one set of heads, both sets had the same problem.
(did I mention we spent $2000.00 on custom inconel valves and push rods for these junk procomp heads)
Now I have to call procomp again, and speak to Jay, Jay was not in (I might add that Jay did try to help us) so I spoke to
this CLOWN named Carlos, I had one simple question for "Carlos" it was about a casting #, and we got into it, (I was
going to call back for Jay later and I did) he said (Carlos the clown) I was wrong, and people are making 700hp with
these procomp cylinder heads. I asked him to give me the name of "ONE" person making 700hp with a procomp head!
To my surprise he did, and he gave me his phone number. I hung up on him, (pissed) and called the name and number
he gave me. (Thunder chicken was the co.) I called Thunder chicken, and the owner told me, "CARLOS was CRAZY".
Not only has he never made 700hp with a procomp head, but he has not built an engine in over a year, and can't get rid
of the 2 sets of procomp heads he has in stock. I then called Jay at procomp heads and spoke to him, I told Jay about
the problem with "Carlos the clown" and the phone call I made to thunder chicken, then told him of the problems with
the "CNC'D" heads he sent me. At this point I asked Jay if he had a set of CNC heads on the shelf, in stock, that he
could look at, at the same time I was, so I could explain the problems to him, as he looked at the head. He said he did,
he got a head, and we went over the MANY problems, "HE AGREED" they were a mess!! Then for some unexplained
reason, he got mad at me for calling them junk? After he said he saw the problems! (go figure)
Our conversation was OVER!
These procomp heads may look good, but valves should not seat on aluminum, and the heads should make power, NOT
ROB IT!
Now we buy 2 sets of BRODIX IK 180's, as cast. WOOOW!
(We can't use the same valves or push rods with the brodix, another $2000.00+ out the window)
To be continued: just getting started the procomp head is JUNK!
... PROCOMP MOTORSPORT HIGH
PERFORMANCE ALLOY HEADS ...
PROCOMP MOTORSPORT HIGH
PERFORMANCE IRON HEADS ...
PERFORMANCE ALLOY HEADS ...
PROCOMP MOTORSPORT HIGH
PERFORMANCE IRON HEADS ...
| Procomp electronics cylinder heads, forced our hand in publishing this. We gave them every chances to make this right! We have the dyno results, and phone records, to prove every word we say is true!!! |
| This BG 600 flows 900cfm (best results with the procomp 195cc head) |
9.2:1CR
 |
| To make a very long story short, we'll list the results from worst to best. |
PRO COMP as cast 180cc, and cnc'd 210cc (worst)
used Stock GM vortec 1 ton p/u truck heads 30hp gain (good)
Brodix IK 180 as cast, 35hp gain over the vortec (very good)
AFR 195 eliminators, 37hp gain over the IK 180's (Best)
used Stock GM vortec 1 ton p/u truck heads 30hp gain (good)
Brodix IK 180 as cast, 35hp gain over the vortec (very good)
AFR 195 eliminators, 37hp gain over the IK 180's (Best)
We will be testing a set of Brodix IK 200's to see how they compare.
| P.S. We see some clowns out there saying the took off a set of cast iron heads (various brands) and put on PC heads picked up 2 tenths of a second or 1-2 mph on the track. That is not a test of the heads!! When you lose 60+ pounds of weight, you should go faster, second atmosphere, and track conditions change producing different results. (you ever heard of ANYONE saying, I took off my TFS, Brodix or AFR's and swapped them for a set of procomps?) The only way to do an accurate test is on a dyno......... rip off one set of heads, throw on another and do a pull (or in this case hundreds of pulls) A stock set of GM vortec heads will SMOKE the procomps and most after market cast iron heads! (real vortec, not center bolt) a 30hp gain is worth the extra weight!! If i were on a budget, and could not afford a good set of aftermarket heads and wanted to make power, the GM vortec is the way to go. P.S.S. The "problem's" with the PC heads goes much deeper than "flow numbers"! |
"ANYONE" who doubts our findings on the procomp heads,
and is willing to dyno test their engine in a head for head
swap, "with us". We will be glad to do it. $800.00.
we will supply all gaskets and head swap labor + 1 day dyno time,..... you supply engine,oil, af, etc, and your stock
heads. You can bring any configuration PC head you want. If your PC heads beat a stock set of vortecs we pay!
and is willing to dyno test their engine in a head for head
swap, "with us". We will be glad to do it. $800.00.
we will supply all gaskets and head swap labor + 1 day dyno time,..... you supply engine,oil, af, etc, and your stock
heads. You can bring any configuration PC head you want. If your PC heads beat a stock set of vortecs we pay!