Aluminum cylinder heads
#1
Aluminum cylinder heads
ProComp Aluminum Cylinder Heads Bare Castings. $795/pr. + $65 S&H READY TO SHIP
Will fit 330/350/403/400/425/455 and D/DX 350.
IMG_20140629_175753_656_zpszylnlsrm.jpg
IMG_20140629_175439_504_zps0sl7mehk.jpg
IMG_20140629_175525_086_zps1rtmcmvg.jpg
Options/add ons:
Assembled w/77cc chambers, Stainless Ebrock Valves, springs for flat tappet hydraulic cam, etc. $1595
Ported & Assembeled $2295 2.072/1.680 FLO 300/180 70cc CHAMBERS
Ported & Asssembled $3177 2.150/1.650 FLO 340/210 CHAMBERS PER REQUEST FROM 70cc-55cc, CUSTOM MANLEY VALVES, HYD ROLLER SPRINGS.
Will fit 330/350/403/400/425/455 and D/DX 350.
IMG_20140629_175753_656_zpszylnlsrm.jpg
IMG_20140629_175439_504_zps0sl7mehk.jpg
IMG_20140629_175525_086_zps1rtmcmvg.jpg
Options/add ons:
Assembled w/77cc chambers, Stainless Ebrock Valves, springs for flat tappet hydraulic cam, etc. $1595
Ported & Assembeled $2295 2.072/1.680 FLO 300/180 70cc CHAMBERS
Ported & Asssembled $3177 2.150/1.650 FLO 340/210 CHAMBERS PER REQUEST FROM 70cc-55cc, CUSTOM MANLEY VALVES, HYD ROLLER SPRINGS.
Last edited by Smitty275; July 12th, 2014 at 02:51 AM.
#3
As far as getting the heads to flow it is initially all done by hand a little at a time. Back and forth from work bench to flow bench. Then templates are made so it is easy to reproduce each port. After doing a pair ir two of a given head I can usually get very close before I even pick up the templates. Since the ProComp castings are new I do not use a CNC. Though it would make reproduction essiey it would add expense due to the low volume of heads ran. Should demand grow I'll have the ports digitized and go that route. Each head is guaranteed to produce the numbers on the included flow bench test sheet that accompanies each head. I've had my own flow bench for about 20yrs and have never had a customer that took heads for independent testing come back with numbers less than I tested at.
#4
pro comp heads
I already have a pair a pro Comp heads how much to get them to flo 300 and 180?and also what do these blow out of the box and at what lift will they flo 300 ?what is the most horsepower /torque you've gotten with these heads ?
#5
On your castings its $1595 for 300/180 @ .600 w/70cc chambers.
As far as with these heads I have not had opportunity to do any builds shooting for max power. But if you build it right and maximize your combination 650-700hp is well within reach.
As far as with these heads I have not had opportunity to do any builds shooting for max power. But if you build it right and maximize your combination 650-700hp is well within reach.
#6
As far as getting the heads to flow it is initially all done by hand a little at a time. Back and forth from work bench to flow bench. Then templates are made so it is easy to reproduce each port. After doing a pair ir two of a given head I can usually get very close before I even pick up the templates. Since the ProComp castings are new I do not use a CNC. Though it would make reproduction essiey it would add expense due to the low volume of heads ran. Should demand grow I'll have the ports digitized and go that route. Each head is guaranteed to produce the numbers on the included flow bench test sheet that accompanies each head. I've had my own flow bench for about 20yrs and have never had a customer that took heads for independent testing come back with numbers less than I tested at.
#7
re
I sent my heads to Smitty late last year. I was OVERLY happy with the results and I did have them put on a local flow bench. They flowed within 1-2 cfm from what Smitty stated they flowed. Very honest and great work. There are a lot of big names out there claiming 300-320 cfm @ .600 that really flow 270-280 cfm and they charge more. This is the real deal!
#8
what type of engine did you build? What combination is it?
I sent my heads to Smitty late last year. I was OVERLY happy with the results and I did have them put on a local flow bench. They flowed within 1-2 cfm from what Smitty stated they flowed. Very honest and great work. There are a lot of big names out there claiming 300-320 cfm @ .600 that really flow 270-280 cfm and they charge more. This is the real deal!
#9
re
We are still putting mine together. 468 bottom end. Edelbrock air gap and heads done by Smitty, pro systems carb, ARH headers. 480lE trans with paddle shift. But this isn't helping Smitty's original post...sorry for side tracking.
#11
There are a lot of things that influence HP. "IF" the engine is built in a manor to make full use of the cylinder heads potential you can figure on approximately 2.3HP per CFM of intake flow as your max HP potential. And yes that should ring true for these heads as well as most others.
Even on engines that are not meant to make absolute maximum HP better flowing heads will make more power. Remember an engine is nothing more than an air pump and, to an extent, the more air in the more power out.
Even on engines that are not meant to make absolute maximum HP better flowing heads will make more power. Remember an engine is nothing more than an air pump and, to an extent, the more air in the more power out.
#14
ok thanks. some guys dont. do u have the low and mid lift numbers? i know procomp has a mixed reputation but how many sets of these olds heads have you sold? the chevy boys ive spoke with either say they hate there chevy heads or they love them! lol. they raised the exhaust ports and added longer valves so u cant run standard bolts etc. any changes with their olds designs? thanks. sorry for all the ?s. cam
#15
I only use the ProComp castings that come machined with seats and bronze guides. All other hardware I supply from trusted sources like Manley, Milodon, Edelbrock, etc. depending on the build.
Yes, I have all the numbers. Just not off top of my head. Below is a thread that is mainly about the ProComp head from a while back. There are some flow numbers and a lot more pictures for you to peruse.
https://classicoldsmobile.com/forums/showthread.php?t=74468
Yes, I have all the numbers. Just not off top of my head. Below is a thread that is mainly about the ProComp head from a while back. There are some flow numbers and a lot more pictures for you to peruse.
https://classicoldsmobile.com/forums/showthread.php?t=74468
#16
And yes, the early ProComp heads for the Chevies were suspect. No denying that. But they have grown a lot since then and continually improved. Their castings for all of their heads are very good now. I know of several shops who use their SBC and BBC castings just as I do and out fit them to fit the build. Then they put their own insignia on them.
#18
Yes, they are a direct bolt on. Compression ratio can be from stock to "more than it should be". I can cut the chambers to what you need which is what would determine the cr based on piston used.
#19
I'm paying full attention.
#26
A lot to this question. Why run lash caps? Which Manley valves? (I'm a warehouse distributor for them.) Are they off the shelf or custom?
Alignment, pushrod/stud/valve/rocker isn't going to change. But where the roller ends up on the valve tip may. ( Centered vs inboard/outboard.)
Alignment, pushrod/stud/valve/rocker isn't going to change. But where the roller ends up on the valve tip may. ( Centered vs inboard/outboard.)
#28
Fully ported with chamber work I have them going 340+ @ .600 lift. Max lift can be anything within the realm of lobe size and rocker ratio and has to be known going into the build so proper components are used. With regular roller rockers you limited to about .800. With shaft mount over an inch is possible.
I use custom Manley valves. Springs depend on application (cam type). Usually Manley, PAC, or CC.
I use custom Manley valves. Springs depend on application (cam type). Usually Manley, PAC, or CC.
Last edited by Smitty275; August 21st, 2014 at 06:22 AM.
Thread
Thread Starter
Forum
Replies
Last Post