Dynamometer Results & Comparisons - AI 243 heads with stock cam

I went to the DYNO yesterday by Geoff with my 243 AI 226 heads that where milled .008 with a .045 head gaskets and the car made 353 hp and 355 tq. The car is a auto with yank 3600, BBK header, fast 92, stock cam. I have a 230/238 cam from Geoff and it will be going in sometime in the next few weeks. I didnt dyno the car before but I think I picked up a solid 35 hp to the wheels.

Is that with a tune or without? Good numbers with a stall. Locked or unlocked?

I think I would have expected higher number's. Most full bolton only car are making 350-360 (with stock heads & cam). So without the heads but still having full bolton's your car is only making 320rwhp?

was the convertor locked or unlocked?

your 11.97@112.2 is very good for just bolton's in a full weight car.
Could be a stingy dyno.

Dont forget its an auto.
FWIW my car makes 326rwh.
I think his #s are right.

what compression ratio does that work out to? was considering doing almost the exact same setup

I will have to check with Geoff on the converter being locked. The car was never dyno tuned just basic tunning on the street. I just wanted to pull it and make sure the tune was not way off and get a base line before the cam. We could have maybe got a little more out of it but I didnt want to waist time on it being the cam is going in shortly.

what compression ratio does that work out to? was considering doing almost the exact same setup

I think its 10.7

The addition of better heads with the stock cam probably netted you 15 or so HP. With the new can you will get a ton of power though with the heads.

The addition of better heads with the stock cam probably netted you 15 or so HP. With the new can you will get a ton of power though with the heads.

I would say its going to be more then that auto cars with stalls dyno 318 to 328 all day long. So 30-35 to the wheels is going to be close to 50hp with just a head swap and no other changes. I will try to get to the track in the next couple of weeks, Im expecting to see 114 mph if the heat doesnt kill it.

Nice job! That stock cam will not be able to take advantage of your new found head flow, in fact its surprising to see that much gain with just heads imho, with that cam i wouldn't be surprised if you get 425rwhp+ and 390tq

Very sturdy and not surprising. AI knows how to optimize a given setup and work heads accordingly. That's a reliable ass setup right there. That would be knocking on the door of 400rwhp in an M6 (maybe over if converter unlocked) and no worries about spring changes. Put some Kooks or ARH 1 7/8 headers on it, tune it properly, and drive the **** outta that thing like it is!

Is your cam the same one he ground for me? 230/238 113+2 (eps lobe intake, lsl exhaust)

Def interested in what it makes after the cam. What LSA/ICL was it ground on?

I think I would have expected higher number's. Most full bolton only car are making 350-360 (with stock heads & cam). So without the heads but still having full bolton's your car is only making 320rwhp?

was the convertor locked or unlocked?

your 11.97@112.2 is very good for just bolton's in a full weight car.
Could be a stingy dyno.

Most bolt-on cars made 350-360rwhp? I don't think this is accurate.. Maybe through a 6-speed but not an auto. When my car was a bolt-on car and a 4200rpm stall it only made 298rwhp and ran a 12.60@107mph. Stock it went 13.60@104mph. Then I went H/C/I the car made 447rwhp and ran a 10.90@123mph 1.46 60ft..

Dyno's aren't accurate when reading a stalled auto car.

Most bolt-on cars made 350-360rwhp? I don't think this is accurate.. Maybe through a 6-speed but not an auto. When my car was a bolt-on car and a 4200rpm stall it only made 298rwhp and ran a 12.60@107mph. Stock it went 13.60@104mph. Then I went H/C/I the car made 447rwhp and ran a 10.90@123mph 1.46 60ft..

Dyno's aren't accurate when reading a stalled auto car.

Listen to this! After you cam it be prepared for a neck breaker!

Is your cam the same one he ground for me? 230/238 113+2 (eps lobe intake, lsl exhaust)

I think its close to that, I will take a look at the cam card and let you know.

Is your cam the same one he ground for me? 230/238 113+2 (eps lobe intake, lsl exhaust)

230/238 113+2 600 .603 lift

Awesome! I'm suprised it picked up that much, especially wihout messing with the WOT tune that much. Those heads must really flow at low lift. Without a lot of dyno magic, you won't find a bolt on only stalled auto putting out this much. Period. Great numbers man.

Just curious, why did you do the heads first and not cam? Thanks for the post, I've been looking for something like this for a while.

In for the results when cam goes in

I'd be content. Definitely excited to see what it'll do with your cam. Track and dyno numbers asap please!



Does anyone know untouched 243s in a bolt-on-LS1 put down via stock stall?

Awesome! I'm suprised it picked up that much, especially wihout messing with the WOT tune that much. Those heads must really flow at low lift. Without a lot of dyno magic, you won't find a bolt on only stalled auto putting out this much. Period. Great numbers man.

I'm very happy with the heads considering the cam stopped making power at 5800 rpm

Just curious, why did you do the heads first and not cam? Thanks for the post, I've been looking for something like this for a while.

I knew the heads would make more power and my plan was to do the heads then spray a 175 shot and see if I can get the car to go some 10.60 - 10.70 with the stock cam. I'm still up in the air on this, Im itching to put the cam in now.

Awesome! I'm suprised it picked up that much, especially wihout messing with the WOT tune that much. Those heads must really flow at low lift. Without a lot of dyno magic, you won't find a bolt on only stalled auto putting out this much. Period. Great numbers man.

Just curious, why did you do the heads first and not cam? Thanks for the post, I've been looking for something like this for a while.

I was thinking the same thing about going with the heads 1st.

Nice to see the car is up and running! Should be ~10.6-10.7:1 w/ a 64cc head, though the exact # may vary a bit w/ gasket bore diameter & actual compressed thickness. The 226cc CNC work tends to gain ~40-45rwhp over an as-cast 243, but some converters obviously make racing the drum futile. I'm sure it'll run well before & after Geoff's cam. A 232/240 at that relative level of aggressiveness would likely manage 450-470rwhp in a stick car w/ the 226cc CNC work. Good luck with it!

-Phil

Anxiously anticipating the progression of this project! Could we see another N/A, H/C, stock short block, 10 sec F body from KH504?

So tht was ur Lil tweaks n tune setup for..we shudd run it back again...both of my axles were bent...tht was my problem

OK so I put Geoffs 230 / 238 cam in and picked up 61RWHP with no other changes to the car. The only other thing that was changed is the 373 gears in the car and it went from 112mph to 120mph with the cam. the car made 414RWHP @ 5700 and at 6800 it still made 409RWHP.

great results!!!

OK so I put Geoffs 230 / 238 cam in and picked up 61RWHP with no other changes to the car. the car made 414RWHP @ 5700 and at 6800 it still made 409RWHP.

Good numbers. How does the car drive?

The car drives great thanks to Geoff.

I went to the DYNO yesterday by Geoff with my 243 AI 226 heads that where milled .008 with a .045 head gaskets and the car made 353 hp and 355 tq. The car is a auto with yank 3600, BBK header, fast 92, stock cam. I have a 230/238 cam from Geoff .

Why didn't you go with a AI cam thats optimized for the CNC'd heads?

Why didn't you go with a AI cam thats optimized for the CNC'd heads?

I'm sure if anyone can spec a cam for a given set of cylinder heads to be fully optimized, that Geoff Skinner is one of them.

Phil@AI also is right there with him. I could only hope to be mentioned in the same regards as them.