Hi.... I'm curious, has anyone out there used these 308 heads & if so, have they had any problems?
I know that quality parts cannot be beaten when building an engine for performance, and that YT-9 or COME heads are the most desirable, but I'm just wondering how the ATR/ProComp heads compare to a standard cast iron VN head & how much room there is for improvement compared to the benchmark YT/COME heads?
Jason
ATR Racing/ProComp alloy 308 heads?
Started by
_78GroupC_
, Feb 14 2011 06:30 PM
37 replies to this topic
#2
_niterida_
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Posted 14 February 2011 - 06:37 PM
do a search on pro-comp and you will find your answer.
which will be basically stay well clear of them.
which will be basically stay well clear of them.
#3
_78GroupC_
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Posted 14 February 2011 - 06:46 PM
Yeah.... I've already checked their feedback..... thats what prompted me to ask this question.
Cheers
Cheers
#5
_78GroupC_
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Posted 14 February 2011 - 07:02 PM
Thanks thats usefull info.
Basically very poor castings & end machining.
Cheers
Jason
Basically very poor castings & end machining.
Cheers
Jason
#6
_Kush_
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Posted 14 February 2011 - 07:05 PM
Why does everyone bag Procomp?? They produce very amusing novelty paper weights that resemble engine components!
Cmon guys.....
Cmon guys.....
#7
_daveHQ_
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Posted 14 February 2011 - 07:43 PM
Why does everyone bag Procomp?? They produce very amusing novelty paper weights that resemble engine components!
Cmon guys.....
and there head gaskets make great stencils for the kids!
#8
_nemo355v8_
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Posted 14 February 2011 - 08:19 PM
Ha Ha good to see my Ebay add still getting refered to, LMAO
Still using there heads thou, nothing in the heads are their thou.
Still using there heads thou, nothing in the heads are their thou.
#9
_AGGETTS_
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Posted 15 February 2011 - 12:12 AM
I have a set of precision custom sheetmetal r/covers that the bolt holes dont line up!! I built an engine for a mate at least the bolt holes lined up but after tightning the covers up you could still move the gasket with your finger. Would have put them in the scrap but had already had them polished and catch can fittings welded in them.Had to get them machined as they were over 300 thou out!!! Another blown clevo engine I know of had these heads on it and all the exhaust seats fell out of the heads. What a mess that was!!!!!
STAY AWAY!!!!!!!!!!!!!!
STAY AWAY!!!!!!!!!!!!!!
#10
_sbc57lx_
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#11
_uctorry_
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Posted 15 February 2011 - 09:41 AM
heads make excellent door stops
cant beat them
just need to grind ends square first
then they work great
cant beat them
just need to grind ends square first
then they work great
#12
_nzstato_
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Posted 15 February 2011 - 10:46 AM
For anyone over here that need a warning, these are the guys that are flogging the procomp gear on trade me (though they often don't name it as a brand)
http://www.trademe.c...?member=2194622
I got ripped off too, back when I had more money than sense (and hadn't done my research)
Sadly the local rare spares is also stocking their crap
http://www.trademe.c...?member=2194622
I got ripped off too, back when I had more money than sense (and hadn't done my research)
Sadly the local rare spares is also stocking their crap
#13
Redslur
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Posted 15 February 2011 - 11:50 AM
Out of interest. A mate of mine purchased the same set of heads, prior to their "more recent reputation" was known. They actually worked very well, he had no issues with machining or fitment and they flowed around the same as VN cast heads. The car was a healthy 13 second Torana. Guess he was one of the lucky ones.
Not that I support their product but just found it to be interesting. Can't comment on any other of their products though.
Not that I support their product but just found it to be interesting. Can't comment on any other of their products though.
#14
Punchy
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Posted 15 February 2011 - 10:45 PM
Must agreed i fell into their trap as well some many years ago - before the news got out..
However not only did i buy the set of alloy heads they offer - i also bought the 355 stroker kit as well ! through EGay and said well known procomp reseller
Since then i have been unbale to convince anyone to remachine / rebalance the rotating assemblys as in their own words, "it would cost more in mallory metal to get them to the right weight than to buy a new replacement chinese crankshaft" ( as stated by crankshaft engineering )
In addition to his comment, they added the indexing of these cranks is quite poor, and further more, the key slots are usully out as well so best of luck gtiing the cam timing within cooee as well..
All of this has been said, without a single micrometer being put on my gear as yet..So who knows
But the common knowledge is the hardened valve inserts tend to fall out of the head as they are cold pressed in....bad bad bad in an alloy head
So in short, i have 2 alloy heads and a rotating assembly which i nows use as a clearancing aids for grinding the blocks and so on for the stroker kits to be fitted. Better than damaging a nice come crank or the like i suppose
However not only did i buy the set of alloy heads they offer - i also bought the 355 stroker kit as well ! through EGay and said well known procomp reseller
Since then i have been unbale to convince anyone to remachine / rebalance the rotating assemblys as in their own words, "it would cost more in mallory metal to get them to the right weight than to buy a new replacement chinese crankshaft" ( as stated by crankshaft engineering )
In addition to his comment, they added the indexing of these cranks is quite poor, and further more, the key slots are usully out as well so best of luck gtiing the cam timing within cooee as well..
All of this has been said, without a single micrometer being put on my gear as yet..So who knows
But the common knowledge is the hardened valve inserts tend to fall out of the head as they are cold pressed in....bad bad bad in an alloy head
So in short, i have 2 alloy heads and a rotating assembly which i nows use as a clearancing aids for grinding the blocks and so on for the stroker kits to be fitted. Better than damaging a nice come crank or the like i suppose
#15
IMORAL
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Posted 26 March 2011 - 10:18 PM
I really wish I read this 6 weeks ago! I am not game to start the car now.
#16
_LJ355_
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Posted 26 March 2011 - 11:05 PM
unfortunatley mate you wont be the only one to learn the hard way
#17
_Bomber Watson_
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Posted 27 March 2011 - 11:04 AM
I really wish I read this 6 weeks ago! I am not game to start the car now.
Personally i wouldent.
Just pull it out, pull it down and start again.
If you re ebay the stuff now before it breaks you will get back more of your losses.
Cheers.
#18
_Quagmire_
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Posted 27 March 2011 - 12:07 PM
alloy is about 5 bucks a kilo
if all else fails you got 50-100 from the scrappy
if all else fails you got 50-100 from the scrappy
#19
madmax
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Posted 27 March 2011 - 07:12 PM
mate of mine calls motors built with pro comp "chinese hand gernades' you dont
know when they will go off!!!!!!!!!!!!
but how can they get away with selling junk???????
know when they will go off!!!!!!!!!!!!
but how can they get away with selling junk???????
#20
dattoman
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Posted 27 March 2011 - 07:31 PM
They get away with it because the consumer... i.e us... are essentially tight arses
We know better... we know the brand names that work... but we want cheap
So we buy crap
Well... you guys have
My heads are Patroits out of USA
We know better... we know the brand names that work... but we want cheap
So we buy crap
Well... you guys have
My heads are Patroits out of USA
#21
_Kush_
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Posted 27 March 2011 - 08:15 PM
You have to research the crap out of everything before you put money down.
There is nothing in this life that is cheap AND high quality....except shaggin the missus
As the saying goes, you get what you pay for.
Ps. I'm getting AFR heads. And yes the pennies had to be saved up.
There is nothing in this life that is cheap AND high quality....except shaggin the missus
As the saying goes, you get what you pay for.
Ps. I'm getting AFR heads. And yes the pennies had to be saved up.
Edited by Kush, 27 March 2011 - 08:20 PM.
#22
_bathurst-racer_
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Posted 28 March 2011 - 03:27 PM
Just curious Kush, did you buy the AFR heads with the high exhaust ports which need different headers ? I'm looking at a set myself and I'm wondering if other people think the extra expense is worthwhile like I do.
#24
Toranamat69
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Posted 28 March 2011 - 07:24 PM
There is nothing in this life that is cheap AND high quality....except shaggin the missus
Don't worry - you pay one way or another :-)
I tell my wife she is an emotional terrorist.
#25
_Kush_
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Posted 28 March 2011 - 07:55 PM
Toranamat69, yes I know what you mean...... It just works easier in my head if I think of it as free, because I don't hand over cash before the deed.
Bathurst-racer, I haven't ordered the heads yet, but I will get the 210 mid year. I've been looking around at top end (heads, intake etc) equipment and I just know that's what I want. Wherever the exhaust ports are won't bother me because I'll be building the pipes to suit. Sorry I can't be more help.
Bathurst-racer, I haven't ordered the heads yet, but I will get the 210 mid year. I've been looking around at top end (heads, intake etc) equipment and I just know that's what I want. Wherever the exhaust ports are won't bother me because I'll be building the pipes to suit. Sorry I can't be more help.
Edited by Kush, 28 March 2011 - 07:58 PM.
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