my set of AFR 205cc Heads
08-18-2005, 06:49 AM
#1
my set of AFR 205cc Heads As my mechanic was putting the accessories back together in the car, after swapping in the AFR heads, he ran into a problem with the bolts for the water pump.
Turns out the holes in the AFR heads were too shallow (or too deep, i forgot which), so the stock bolts wouldnt work!
He was able to scrounge around his box of bolts, and find some that work out, but I wish I knew of this on advance, and would have puchased the right bolts up front.
Anyone else run into something like this?
Turns out the holes in the AFR heads were too shallow (or too deep, i forgot which), so the stock bolts wouldnt work!
He was able to scrounge around his box of bolts, and find some that work out, but I wish I knew of this on advance, and would have puchased the right bolts up front.
Anyone else run into something like this?
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08-18-2005, 04:17 PM
#12
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Mine were fine too. If I recall, this (accy hole depth) came up with one of the very early 205 runs and way corrected long ago, find out how long they sat on the shelf.
08-18-2005, 04:53 PM
#13
Originally Posted by Mirek
Mine were fine too. If I recall, this (accy hole depth) came up with one of the very early 205 runs and way corrected long ago, find out how long they sat on the shelf.
You are correct (well almost....LOL)
There was a concern over accessory hole depth and after evaluating the situation we found out that the General decided to drill different types of castings at different bolt depths. We modeled our casting geometry and locations from a stock LS6 243 casting.....what we came to find out later was that a 5.3 head is deeper than a 243 casting, a 5.7 head was actually more shallow (might have been the other way around....its been awhile). Anyway, we had the room to slightly deepen the threaded accessory holes which we did, now matching the deepest depth that came out of the factory. The heads on my car were pre-production units (one of the first heads to be produced) and I had no bolt depth issues on my C5 install. Why a select few did and most did not I have no clue, but the bottom line is that all the LS1 castings produced in the last 12 months or so incorporate the deeper drilled accessory bolts.
Hope this helps to clear a few things up....
Tony M.
PS....By the way, it's never out of the question that a tap might have broken in one of our CNC machines causing an issue that would have easily gone un-noticed by QC. It's not out of the question that might be the case here if in fact the depth of the hole was checked and found to be different than the others. Just a thought....
Last edited by Tony Mamo @ AFR; 08-18-2005 at 05:00 PM.
08-18-2005, 07:13 PM
#14
Thanks for chiming in Tony.
How can I determine when these heads I purchased, from one of your vendors, was produced?
And is it alright, being that he was able to come up with alternate bolts to fit the holes ?
-------------
There was a concern over accessory hole depth and after evaluating the situation we found out that the General decided to drill different types of castings at different bolt depths. We modeled our casting geometry and locations from a stock LS6 243 casting.....what we came to find out later was that a 5.3 head is deeper than a 243 casting, a 5.7 head was actually more shallow (might have been the other way around....its been awhile). Anyway, we had the room to slightly deepen the threaded accessory holes which we did, now matching the deepest depth that came out of the factory. The heads on my car were pre-production units (one of the first heads to be produced) and I had no bolt depth issues on my C5 install. Why a select few did and most did not I have no clue, but the bottom line is that all the LS1 castings produced in the last 12 months or so incorporate the deeper drilled accessory bolts.
Hope this helps to clear a few things up....
Tony M.
PS....By the way, it's never out of the question that a tap might have broken in one of our CNC machines causing an issue that would have easily gone un-noticed by QC. It's not out of the question that might be the case here if in fact the depth of the hole was checked and found to be different than the others. Just a thought....
How can I determine when these heads I purchased, from one of your vendors, was produced?
And is it alright, being that he was able to come up with alternate bolts to fit the holes ?
-------------
There was a concern over accessory hole depth and after evaluating the situation we found out that the General decided to drill different types of castings at different bolt depths. We modeled our casting geometry and locations from a stock LS6 243 casting.....what we came to find out later was that a 5.3 head is deeper than a 243 casting, a 5.7 head was actually more shallow (might have been the other way around....its been awhile). Anyway, we had the room to slightly deepen the threaded accessory holes which we did, now matching the deepest depth that came out of the factory. The heads on my car were pre-production units (one of the first heads to be produced) and I had no bolt depth issues on my C5 install. Why a select few did and most did not I have no clue, but the bottom line is that all the LS1 castings produced in the last 12 months or so incorporate the deeper drilled accessory bolts.
Hope this helps to clear a few things up....
Tony M.
PS....By the way, it's never out of the question that a tap might have broken in one of our CNC machines causing an issue that would have easily gone un-noticed by QC. It's not out of the question that might be the case here if in fact the depth of the hole was checked and found to be different than the others. Just a thought....
08-27-2005, 11:36 AM
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Originally Posted by Michael02hawk
Thanks for chiming in Tony.
How can I determine when these heads I purchased, from one of your vendors, was produced?
And is it alright, being that he was able to come up with alternate bolts to fit the holes ?
How can I determine when these heads I purchased, from one of your vendors, was produced?
And is it alright, being that he was able to come up with alternate bolts to fit the holes ?
08-27-2005, 07:46 PM
#17
Yes.
Yes, yes and yes...the car is up and running, very nicely!
My mechanic was able to get some GM factory bolts for that bracket, which I like a lot, since the GM bolts have the washer and all built right into them.
My alternator bit it, and died after everything was put back together, so I ended up buying another one! But now its running great.
------------
Mike, do you have it up and running yet?
Yes, yes and yes...the car is up and running, very nicely!
My mechanic was able to get some GM factory bolts for that bracket, which I like a lot, since the GM bolts have the washer and all built right into them.
My alternator bit it, and died after everything was put back together, so I ended up buying another one! But now its running great.
------------
Mike, do you have it up and running yet?
