|07-04-2014 01:15 PM|
|Sundance7055||I have the same heads on my 383...the problem with these heads are there is too much meat inside the chambers witch block the flow...check it out you'll see...I saw a video on you tube that dealt with this problem|
|04-22-2013 06:40 PM|
|04-22-2013 04:32 PM|
is it me r does the rocker arms not look right.
Yes i know this is over a month old
|03-01-2013 09:26 PM|
I got some cnc AVG/PC 351C A3 port heads for $1900 complete, really nice castings, really happy with them, looking to buy another set right now.
|11-16-2012 04:17 PM|
|496CHEVY3100||me 2 cents I purchaced a set of procomp oval port 300cc aluminum heads pro comp layered gaskets and proconp studs for aluminum headsfor a total of $1150.00 including tax from ASA in COLUMBUS GA add said completly assembeled opened package today to puy on my BBC engine they are NOT together have to put on guide plates and studs problem is bolts for studs are7/16, holes in heads 4 are 7/16 4 are 1/2 holes 1 head came with helicoil but they dont fit the holes 2 guide plates do not align with pushrods the set at approx 30 degrees so i am going to have to remove heads redrill tap and helicoil both heads so rocker studs will fit i will loose layered head gaskets 70.00 plus labor sealer and antiseize trial fit intake after problem with heads you guessed it, intake does not fit some of bolt holes are off 1/2 of the hole this is a factory GM tripower intake so i cant enlongate holes with runing value of intake approx $1200 just incase anyone cares I AM NOT HAPPY, Dont wast your money|
|10-15-2012 07:26 PM|
|Jim Rockford||Why was it back when we made everything here and bought the things WE made a man could have a decent paying job and things where affordable... **** went to hell in a hand basket when we started importing all this crap and sending jobs overseas.|
|10-15-2012 06:32 PM|
Based on the valve issue, sound like the previous owner lied to you and they had a clean up and new valves put in. There are several dealers on ebay selling the heads with their own valves and springs. No telling what they do in assembling them. Hard to say it's Procomp's fault.
Could also be a machine shop drumming up business..."yep, they're all bad"
My heads worked perfect. The new owner has had them on a year and loves them. My Airwolf heads use a Procomp core and are flat out ******.
|10-15-2012 04:31 PM|
Pro comp heads
I have the new revised 210/ 64 pro comp heads on my sbc 383. Motor is in a 1967
firebird. 3000lbs and I am running 10.90 at 122mph and 6.95 in the 1/8 th @ 99mph
I bought the heads bare and put in my own hardware. Running a .600 solid roller by lunati. Have a ton of passes on them and no problems. Until you buy a set of the new ones dont knock them...
|06-19-2012 10:03 PM|
So now I have input on Pro Comp aluminum heads, and it ain't good.
Last fall I got a smokin deal on a pair I found on the local Craigslist. $500 for the pair and a set of ARP head bolts tossed in too! Brand new, but had been installed on a SBC, but never started up.
Well I was looking for a pair of old "fuelie" heads, but what the heck, these were too good to pass up. Famous last words! I picked them up and during the off season I installed them on the 327 in my Austin gasser. The heads were angle plug, which created some clearance issues, but I got around that. Installed a new set of roller tip rockers, and a new cam while it was all apart.
A couple weeks ago I started noticing one cylinder was not firing well at idle. Pulled the valve covers to find one rocker had a bad roller! It also ate up the valve stem a little, so pulled the head and took it to the local machine shop to have it looked at.
Machinist told me the next day that all the valves were sloppy in their guides! Said it appeared someone bored the guides without honing them to fit each valve correctly. Pulled the 2nd head and he confirmed it also was assembled in the same sloppy manner and all valves guides were sloppy.
Wasn't too excited aout having to replace all the guides, especially when I found out they're all oversized OD also! The new guides would have to either come from Pro Comp, or one of their distributors like Skip White in Tn.
At that point I decided to cut my losses. He had a pair of old 2.02 camel hump cast iron Chevy heads with all new SS valves, hardened seats, new guides and seals, and chambers CC'd. I gave him the crap Pro Comp heads and $150. and walked out the door happy.
In the end it was a cheap lesson, and one I wont forget. I'll never buy Pro Comp again, but if anyone considers them be sure to get bare heads and have your local machine shop assemble and fit them. Don't let the idiots at Pro Comp toss them together!
|04-24-2012 09:06 PM|
|onlyfnway||Well we finally got some track time in on the 509ci BBC with the procomp heads. took a little work to get it dialed in but it went 5.84 on motor and 5.31 on a small kit.|
|02-13-2012 06:38 PM|
ask about what machine work they do to the heads......
something as simple as do you measure installed heights on all springs...
if the anwers dont come.......you get the idea.....
a monkey can assemble heads its as simple as putting the round peg in the round hole.....doing it correctly......takes knowledge
some simple questions...
whats your spring installed heights?
what spring pressures are at that?
what is spring pressure at lift??? (normally its a generic number like firstname.lastname@example.org) and thats an acceptable answer
what is coil bind of spring?
how much clearence do you leave minimum before coil bind?
these are some very basic spring related questions....that should be answered without hesitation... if not......maybe should look some more....
biggest question they should ask you is for your cam information many cams are pretty much built on a baseline that use the same spring rates from several cam companies so 1 spring fits 100's to 1000's of cams..... but there are many that very quite a bit from those baseline (generic) type builds
|02-13-2012 05:37 PM|
i have bin entertaining purchase some prostar heads for sbf. the ad on e bay claims Assembly andmachining is by the seller and comes with 1year warranty. they want 650 with free fraight. Does any one have comments on prostar.i planed to use them on a 302 ford in my 32 2dr,which is used for street only.Old guy needs advice thanks cliff
|02-13-2012 12:51 PM|
on the dui it broke app. mid shaft area
i must admit have never seen the ear on the dizzy shaft end broken off...but that would be the most logical to fail for sure....as the shaft would be weakest.
|02-13-2012 11:56 AM|
I've been around a couple engines, and I can say categorically that I've never seen a shaft broken in two on any distributor, stock or aftermarket.
I have seen gears stripped and worn totally out, and I've seen the oil pump drive shaft on a 351 Cleveland twisted like a pretzel, and the ear broken off a Chevy pump stub where the d-shaft indexes the slot, though.
Clean living, I suppose.
|02-13-2012 11:48 AM|
and a dui HEI unit
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