4.9L Cadillac Information (Page 6/11)
Spadesluck AUG 16, 03:11 AM
Not getting dyno tune specifically, but I do want to get it dyno'd when finished because I am curious what the final numbers will be. I am sticking with the stock ECM right now. I may choose something different later. I do have a 7730 sitting on the shelf and I also could just go with a stand alone as well. I am using the flywheel that came with the car originally. It was a Fiero Factory swap before I got it, so whatever they used. John goes that extra mile with his bigger valves, I just do not have the means to handle that.

Here are some quick head comparison photos:





Here is how it looks right now:

[This message has been edited by Spadesluck (edited 08-16-2020).]

FieroWannaBe AUG 16, 12:07 PM

quote
Originally posted by Spadesluck:

Not getting dyno tune specifically, but I do want to get it dyno'd when finished because I am curious what the final numbers will be. I am sticking with the stock ECM right now. I may choose something different later. I do have a 7730 sitting on the shelf and I also could just go with a stand alone as well. I am using the flywheel that came with the car originally. It was a Fiero Factory swap before I got it, so whatever they used. John goes that extra mile with his bigger valves, I just do not have the means to handle that.




I hope you paid the same level of effort to the intake manifold, the runners have to wrap around the pushrods there, and that is where a flow restriction will be. A lot of people claim its not a restriction, but every time mass has to change direction, it must be accelerated, that requires energy, and it will be pulled out of the air, costing velocity.
Johns 4.9 AUG 16, 12:56 PM
Looks great, Spadesluck! That 6 speed is pretty nice! I'm jealous.
Cheers,
John
Raydar AUG 16, 02:09 PM

quote
Originally posted by Spadesluck:
...
Here is how it looks right now:






Are you installing the F40 "as equipped"?

I am very intrigued by Fieroguru's 3.09 FDR swap. Priced a few UK F40s this morning.
The most expensive one was, I think, ~100 pounds, UK. Shipping would have to be a heller, though.
Spadesluck AUG 16, 02:46 PM

quote
Originally posted by Raydar:


Are you installing the F40 "as equipped"?

I am very intrigued by Fieroguru's 3.09 FDR swap. Priced a few UK F40s this morning.
The most expensive one was, I think, ~100 pounds, UK. Shipping would have to be a heller, though.



As is, I am not that deep in the pockets to try that adventure.
Spadesluck AUG 16, 02:48 PM

quote
Originally posted by FieroWannaBe:


I hope you paid the same level of effort to the intake manifold, the runners have to wrap around the pushrods there, and that is where a flow restriction will be. A lot of people claim its not a restriction, but every time mass has to change direction, it must be accelerated, that requires energy, and it will be pulled out of the air, costing velocity.



The Allante intake is very well built honestly. I did port it some to match the heads but there was not much work to be done. If you have ever had the chance to look at one you will understand there is a big difference between the stock intake and Allante setup.
Will AUG 17, 04:42 PM

quote
Originally posted by Johns 4.9:

I've done some head work. 1.94 and 1.60 stainless steal valves.
Cheers




quote
Originally posted by Spadesluck:

Not getting dyno tune specifically, but I do want to get it dyno'd when finished because I am curious what the final numbers will be. I am sticking with the stock ECM right now. I may choose something different later. I do have a 7730 sitting on the shelf and I also could just go with a stand alone as well. I am using the flywheel that came with the car originally. It was a Fiero Factory swap before I got it, so whatever they used. John goes that extra mile with his bigger valves, I just do not have the means to handle that.

Here are some quick head comparison photos:









Either of you guys get your heads on a flow bench?
Raydar AUG 17, 09:26 PM

quote
Originally posted by Spadesluck:

The Allante intake is very well built honestly. I did port it some to match the heads but there was not much work to be done. If you have ever had the chance to look at one you will understand there is a big difference between the stock intake and Allante setup.



I agree. It has to be a quantum leap above the stock 4.9.

I find the Allante setup to be very much like a TPI, except with even longer runners - by a significant amount. (I jokingly call it a "folded TPI".)
"John's 4.9" has designed a short runner upper intake for the Allante lower. It really looks promising, especially if there's some good head/valve work done, to complement it.
Spadesluck AUG 18, 12:43 AM
Will,

No, I did not do any flow testing as this was just all done in my garage. This has been a learning experience for me being only my second head porting I have done. Only thing I did was weight the heads before and after just to see how much material was removed. Ironically I removed the exact same amount on both heads, 1.3lbs each. M goal is not to set the world on fire, just to learn and have fun with it.

[This message has been edited by Spadesluck (edited 08-19-2020).]

Will AUG 18, 09:06 AM

quote
Originally posted by Raydar:

I agree. It has to be a quantum leap above the stock 4.9.

I find the Allante setup to be very much like a TPI, except with even longer runners - by a significant amount. (I jokingly call it a "folded TPI".)
"John's 4.9" has designed a short runner upper intake for the Allante lower. It really looks promising, especially if there's some good head/valve work done, to complement it.



MaxCubes used an Allante lower to mount is supercharger as well.