Heading to the dyno

We just finished freshing up my motor. I'm heading to the dyno on Wednesday. Any one have an idea or a guess what's it going to do.

521ci
4.300crank 6.8 rod 4.390 bore
14.1 compression
278.intake 286 ex. @.50 739lift solid roller
Ported A429 heads
Ported Victor intake
2" carb spacer
1050 dominator on methanol
2 1/8 headers 4" borla collector mufflers

400+

Depending on port work... cams a little small. 800

the experts said mine is rite at 700, and you have 58 more cubes and 2 more points of compression everything else is close to mine so 760/780 HP

Enough to tug that little fox by the tail an post some stout times

FalconEh wrote:Enough to tug that little fox by the tail an post some stout times

It went 5.85@119 with a smaller cam and a half point less compression. I hurt the converter an figured since it's the end of the season we would add some compression and bigger cam. We also added a moroso 3vane vacuum pump. We never dyno'd it before but it went a little faster then we expected.

5.85 at 119 was a great result. Knowing that and the changes it will be well into the 800 hp range, say 840?
Please post your new cam data but if you're protecting the detail I understand.

Dave De wrote:5.85 at 119 was a great result. Knowing that and the changes it will be well into the 800 hp range, say 840?
Please post your new cam data but if you're protecting the detail I understand.

The cam cards at the shop. So I don't have the specs. But it's not that radical. We were a little concerned about the valves clipping. I have the old A429 heads and it was showing signs of clipping with the old cam.

kim wrote:Depending on port work...  cams a little small.  800

Cam specs is 276-284@.050
.734in .732ex 111lsa 109ilc

Same heads.... 14-1 compression 314 advertised 295 304 i e @ 050 525 cu in 824fwhp. Through 2.0" primary tube hooker super comp headers You might have better port work and need less cam I think superflow said we were just shy of 390 cfm intake and 290ish on exhaust

I hope your cylinder head guy did something about the valves clipping. That's a major problem.

Charlie

Aint my heads anymore. Sold to Pat Neal, that put them on his car.... if your a Pinks Fan might have seen a 72 Camaro with a 514 ford in it on Pinks when it filmed in Tucson.

fe50stang wrote:
The cam cards at the shop. So I don't have the specs. But it's not that radical. We were a little concerned about the valves clipping. I have the old A429 heads and it was showing signs of clipping with the old cam.  

I had the same clipping issue with a reasonably big camshaft with A429 heads. The cam was 276/286 @0.050" and .740ish lift on 110 LC. One could clearly see where the valves were touching -

Sinking valves with the next valve job may be enough? But I reduced intake to 2.19 intake and kept exhaust the same. I probably should have kept the 2.25" intake and reduced exhaust valve to 1.72"

68galaxie wrote:

fe50stang wrote:
The cam cards at the shop. So I don't have the specs. But it's not that radical. We were a little concerned about the valves clipping. I have the old A429 heads and it was showing signs of clipping with the old cam.  

I had the same clipping issue with a reasonably big camshaft with A429 heads. The cam was 276/286 @0.050" and .740ish lift on 110 LC. One could clearly see where the valves were touching -

Sinking valves with the next valve job may be enough? But I reduced intake to 2.19 intake and kept exhaust the same. I probably should have kept the 2.25" intake and reduced exhaust valve to 1.72"

Good idea , then put the exhaust throat to 90% with a 50 degree VJ. I have also just left the valve job alone and just reduced the diameter of both valves enough to make sure that it has no clipping issues. doesn't take much when taking it off both valves. And usually the flow picks up.

Update, It's Wednesday................

I went there today and dropped the engine off. He wants a day or so to get it all hooked up to the dyno. And he's a little concerned about adapting his fuel system to mine. So the plan is give him a couple days to get it all squared away. And we will run it on Saturday. Then I have the whole day to tune on it also and we're not forced to rush it.

I must say though, I didn't sleep hardly at all last night knowing my motors completely assembled and sitting in the bed of my truck. I don't exactly live in the best neighborhood.

You think your having a hard time sleeping with your 1000lb engine sitting in the bed of your truck..... wait till its strapped to the dyno. Outside of child birth... combat didn't even match the stress of the first few dyno pulls. After warm up and initial timing set.... the first time that thing loads out to whatever limit you set............ and in my case it was a hell of a limit... till the power falls off. 9600 rpm....... after the first few times, it gets a little less stressful as your shit stays together, and your just trying to map its window.

Then ya go and blast the N20 at it and blow a channel from cylinder to atmosphere..... ya know in a dull lit dyno chamber a cylinder blowing a hole to atmosphere is a whole lot like lightning.........

Ok fellas I'm heading to the dyno! Fingers crossed

Good luck!

Let us know how it turns out.
I have a very similar build - 12.8:1 CR and A429 heads.
Be interesting to see how your combination does.

Cheers

Keep us posted

well how did it do????

Well things didn't quit go as planned. We ran it for about 5 -10 minutes to get a little heat in it and set the timing. Then We then drained the oil and ran the valves again. Everything looks fine. Put some fresh oil in it and ran it Again. Went to make the first pull and it kinda sneezed out of the carb.? It started sounding like it was mixing up cylinders. Maybe an ignition issue? Everything looks fine but cylinder 1 and 8 are only reading 300 on the EGTs? We checked everything one more time and it sneezed on our attempt to start up. We decided to check the valves one more time. #5 intake has 1/4" of lash. We pulled the rocker and the push rod is quit a bit lower then the rest? So we removed the intake manifold to find the comp. lifter is completely broken at the axle. There are needle bearings everywhere. The roller wheel is ground flat and the cam is waisted?

At this point we don't have any good answers on how it happend. There are brand new lifters and new cam ground on a comp billet core. I'm gonna bring it home and do a tear down Tuesday. But at this point there's debre everywhere

Man DAMN that sucks, I hope you can fix it kinda cheap and quick, sorry for your bad luck

That's a bad day for sure..... Sorry to hear.

Hate to hear anything like this , I had rather hear low hp numbers than something break.
Good luck !