Ai 185cc CNC Heads - First Impression
Everything has been fine with the installation of the heads, intake and SLP shorty's except
for the coolant line that runs against the header. I've finally got it to the point that I'll live with it and had a chance to flog the car a little today. The SOTP meter says WOW! The power band has shifted slightly just as you would think with the addition of the headers and heads. Lost some torque down low and it just screams up high with no sense of it laying back at 6k. The most noticable difference is the cold start and manners before the water temp gets to 160. It's much more finiky now until it gets up to temp, but at temp it's just like it was before except for the different sound from the SLP shorty's. I went a different direction with valve springs since I have never liked the spring rate for the Crane 99893 springs that are recommended on the cam card (Crane 104227). At 391#/in. the open pressure for the 99893's seemed unnecssarily high to me for a baby cam. I went with the Crane 96872 spring which has a rate of 326#/in. and about the same closed pressure at 140#. I switched from 26918 springs with Ti retainers so you can't really do any comparison since the beehive springs are designed for the lighter LS1 (8 mm) valves and corresponding hardware. Based on my initial impression this spring combo is working just fine. This spring is ideal for installed heights in the 1.80 to 1.85 range. I was surprised to find that when I checked my fuel pressure it was way high @ 50#. I guess it's something that I'll need to check about once a year. Last time I adjusted the pressure I set it to 45#. I reset the pressure to 44#. I'd like to be out driving around but it's raining like a MF out there right now. We'll see how things go on the dyno in a couple of months, but I'm hopeful for 360 rwhp. |
Glad it all came together. I hope to get everything back together in time for the dyno day/tuning.
How was the head swap? Did it go smoothly? |
Sounds like everthing is going well. That's good to hear, and I bet it's a blast to drive.:thumb:
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Originally Posted by tireburnin
(Post 5139950)
Glad it all came together. I hope to get everything back together in time for the dyno day/tuning.
How was the head swap? Did it go smoothly? to seeing your car at the dyno. All in all the head swap went really well. The only hitch was the SLP/coolant line issue. In hindsight I should have bought some 3/4" aluminum tubing and just bent my own custom line when the heads were off. The only surprise I had was related to the oil pump drive. After I pulled the intake I went to check the bolt and it was only finger tight. The drive was fine, and I'm sure that I torqued the bolt to 13 ft-lbs so it did not make me happy to find it loose. From now on the oil pump drive bolt goes in with blue thread locker. At 49 years old I ran out of steam tightening the head bolts. It was pretty funny because there were a few that I gave it all I had and just barely got the click out of the torque wrench. By the 30th bolt I was all sweaty and my arms felt like mush. The Impala head gaskets are not marked "THIS SIDE UP" like the stock ones and there is no consensus on which way is up for them. I installed them with the PN facing up based on info from a knowledgeable LT1 engine builder. I also had to set the intake twice since I blew it the first time. Been there and done that before. No big deal, just clean everything up and try it agin. After lots of reading about thread sealants I decided to go with the GM 12346004 for the head bolts. I had ARP sealant on hand and that is what I used on the rocker studs so I'm hoping that they will be fine. I'm glad that I did use the ARP sealant on the rocker studs because I ended up loosening them after the heads were installed to adjust the guideplates. With the 7.05" pushrods you are closer to the end of the slot in the guideplate so I set them as far down as possible to provide the most room. And speaking of guideplates the GMPP parts that were on the stock heads were not hardened! I checked the new GMPP guideplates and they are hardened, so the story that was going around regarding a batch of GMPP guideplates that were not hardened is true. I had close to .050" wear in some locations and this is after only 5k miles. No wonder I had an increased amount of metal powder on the oil drain magnet. Jeff Creech did a great job with his tweaks on the PCM for the new setup and Phil/Ron at Ai were great support during the installation. I can't say enough about the quality of the workmanship on the heads and intake. |
what are the specs on the cam?
ai does good work, i wish i could afford some of their stuff. |
Glad to hear its up and running and you are statisfied. Definatly keep us updated on the results. And I wouldn't use the APR sealent on the rocker studs, it was starting to let oil seep through on my old setup.
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Originally Posted by truedualws6
(Post 5140381)
I hope all goes will with your stripped gears on the oil pump drive. I'm looking forward
to seeing your car at the dyno. All in all the head swap went really well. The only hitch was the SLP/coolant line issue. In hindsight I should have bought some 3/4" aluminum tubing and just bent my own custom line when the heads were off. The only surprise I had was related to the oil pump drive. After I pulled the intake I went to check the bolt and it was only finger tight. The drive was fine, and I'm sure that I torqued the bolt to 13 ft-lbs so it did not make me happy to find it loose. From now on the oil pump drive bolt goes in with blue thread locker. At 49 years old I ran out of steam tightening the head bolts. It was pretty funny because there were a few that I gave it all I had and just barely got the click out of the torque wrench. By the 30th bolt I was all sweaty and my arms felt like mush. The Impala head gaskets are not marked "THIS SIDE UP" like the stock ones and there is no consensus on which way is up for them. I installed them with the PN facing up based on info from a knowledgeable LT1 engine builder. I also had to set the intake twice since I blew it the first time. Been there and done that before. No big deal, just clean everything up and try it agin. After lots of reading about thread sealants I decided to go with the GM 12346004 for the head bolts. I had ARP sealant on hand and that is what I used on the rocker studs so I'm hoping that they will be fine. I'm glad that I did use the ARP sealant on the rocker studs because I ended up loosening them after the heads were installed to adjust the guideplates. With the 7.05" pushrods you are closer to the end of the slot in the guideplate so I set them as far down as possible to provide the most room. And speaking of guideplates the GMPP parts that were on the stock heads were not hardened! I checked the new GMPP guideplates and they are hardened, so the story that was going around regarding a batch of GMPP guideplates that were not hardened is true. I had close to .050" wear in some locations and this is after only 5k miles. No wonder I had an increased amount of metal powder on the oil drain magnet. Jeff Creech did a great job with his tweaks on the PCM for the new setup and Phil/Ron at Ai were great support during the installation. I can't say enough about the quality of the workmanship on the heads and intake. Sounds like a good time. Whenever I get deep into a motor, it's always the small tasks that take the most work. I was glad my motor was out of the car when I put my head bolts in, they are no fun when you are contorting inside the engine bay. I've been there with miss setting of the intake manifold. I don't even try it alone anymore, I have to call friends for that. |
Sounds like fun. What AFPR do you have?
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Originally Posted by slomarao
(Post 5140609)
what are the specs on the cam?
ai does good work, i wish i could afford some of their stuff.
Originally Posted by flyinZ
(Post 5140741)
Sounds like fun. What AFPR do you have?
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Originally Posted by truedualws6
(Post 5140845)
210/224 duration @ .050" w/ 112 ICL - .511/.553 lift w/ 1.6 rockers
It's a TPIS regulator. |
Originally Posted by truedualws6
(Post 5139940)
but I'm hopeful for 360 rwhp.
-Mike |
It's great to hear you got everything up and running again, Mike. Nice work.
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Awesome man!!!
Originally Posted by truedualws6
(Post 5140381)
Jeff Creech did a great job with his tweaks on the PCM for the new setup
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That made me sick to my stomach when I read about that C6
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Originally Posted by marshall93z
(Post 5141665)
Anyone see what someone from CAM did to that C6? :eek:
was all pissed off because his girlfriend broke up with him and he was driving his 1969 Cougar down my block and decided light them up as he passed, only to go into a drift right into my 1968 GTO. He plowed the front drivers side and kept going right into a crepe myrtle tree, which he also knocked down. When I saw the photo of the C6 it was like a flashback to the boom, when the Cougar hit my GTO. Amazing how things jog your memory. The C6 looks a lot worse though, and a 1968 "A" body is a tank in comparison. In addition to paying for my car my buddy had to pay $800 for a replacement tree. Hopefully things will work out between CAM and the C6 owner. |
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