[John Langer]

Originally Posted by slowbird

I think John is referring to this sheet

I never saw that. I was just looking at the sheet attached in post 6 with the jacked bsfc

[cfmcnc]

Originally Posted by John Langer

No where it peaked at like 885 then dropped off to 870 then jumped up in hp and tq to get to 900. I've only seen that one other time.

Have seen this before ,Seems to be when the header sizing is not correct.Bill C.

[Fast Floridian]

I think i prefer the WP Edelbrock for daily street use and pump gas. They definitely kill RA5 for torq and horepower my power is about the same. My 535 motor makes 100 more lbs of torq and horsepower is about the same on 93 .
Ra 5 is definitely a big part of pontiac history i saw the dyno sheet is their a write up where we can read everything in the motor i would love to read up on it......are you related to Keith from Canada. Very impressive build.

[slowbird]

From the pics looks like headers are 4-2-1 type.
Im sure there is more left in this build and over the few days/weeks im sure more updates will follow

[ponjohn]

Originally Posted by cfmcnc

Have seen this before ,Seems to be when the header sizing is not correct.Bill C.

Too small?

[Bill Eveland]

He stated he had throttle and carb issues for the number fluxuation

[dci]

Be easy on Judes guys, he just bought his engine dyno and is learning as he goes. Its no different than tying your shoes for the first time. Obviously we can't know or do everything perfect the very first time attempting it. Honestly, this will probably shed more light on how these heads perform than if someone with more experience were doing it. Judes has not even changed a single part yet from the original recipe and is making good gains. He set his goal high, but this is only R&D for his program and it is also going to be helpful for anyone who follows. He is not doing a one and done to get a bragging sheet, but to actually gain knowledge. So be thankful Judes is sharing all of his data even if it isn't perfect. He's a sharp guy and will get it sorted out. The best part is he is willing to share with all of us so we get to see it all unfold.

Like Bill C stated. I think he didn't have the dyno set properly at first for the dual carbs. It does look like he noticed that now and the one carb is using more fuel it appears. That can be caused by a couple of different things. That carb may have a bad needle and seat or possibly to high of a float setting. Or if he has two regulators maybe the pressure is to high ???

Please be respectful & patient, and enjoy the fact that he is willing to share it all good or bad.

Thanks for following

[Scott Stoneburg]

I will be following the progress. Is there a link to the build? Did he share cam specs or head flow information? Nice job on hitting 900 with it.

[dci]

Originally Posted by Scott Stoneburg

I will be following the progress. Is there a link to the build? Did he share cam specs or head flow information? Nice job on hitting 900 with it.

He has not shared all the engines spec's yet. You can follow him on Facebook Here the spec's I know.
Compression 10.3 to 1
Heads flow 450 @ .900"
Cam 272, 288 @ .050
Rockers 1.85 T&D
Cubic inches 535
Block Aluminum
Heads DCI RA5
Valves Int 2.300, Exh 1.74

I think he plans on increasing the compression to 11.5 eventually. He is also testing with multiple different carburetor set ups. Not sure, but maybe different header sizes too.

[Scott Stoneburg]

Originally Posted by dci

He has not shared all the engines spec's yet. You can follow him on Facebook Here the spec's I know.
Compression 10.3 to 1
Heads flow 450 @ .900"
Cam 272, 288 @ .050
Rockers 1.85 T&D
Cubic inches 535
Block Aluminum
Heads DCI RA5
Valves Int 2.300, Exh 1.74

I think he plans on increasing the compression to 11.5 eventually. He is also testing with multiple different carburetor set ups. Not sure, but maybe different header sizes too.

Cool, thanks

[Dragncar]

Originally Posted by dci

Be easy on Judes guys, he just bought his engine dyno and is learning as he goes. Its no different than tying your shoes for the first time. Obviously we can't know or do everything perfect the very first time attempting it. Honestly, this will probably shed more light on how these heads perform than if someone with more experience were doing it. Judes has not even changed a single part yet from the original recipe and is making good gains. He set his goal high, but this is only R&D for his program and it is also going to be helpful for anyone who follows. He is not doing a one and done to get a bragging sheet, but to actually gain knowledge. So be thankful Judes is sharing all of his data even if it isn't perfect. He's a sharp guy and will get it sorted out. The best part is he is willing to share with all of us so we get to see it all unfold.

Like Bill C stated. I think he didn't have the dyno set properly at first for the dual carbs. It does look like he noticed that now and the one carb is using more fuel it appears. That can be caused by a couple of different things. That carb may have a bad needle and seat or possibly to high of a float setting. Or if he has two regulators maybe the pressure is to high ???

Please be respectful & patient, and enjoy the fact that he is willing to share it all good or bad.

Thanks for following

Hey Don, those 4.35 bore Ross pistons and ring set I sold you, Are they in this build ? If not, how did the build turn out with them ?
At any rate I am glad they were put to good use even though I kinda wish I still had them.

[dci]

Dragncar, this build didn't get those pistons. Those went into another 535 RA5 build for a guy out west. Super fast street car on pump gas. It's probably making around the same power as Judes deal. I think the car weighs around 3500 so should go low nines high eights in the 1/4.. I may never know though, because he's a street racer and doesn't like to share times or numbers.

[Dragncar]

Originally Posted by dci

Dragncar, this build didn't get those pistons. Those went into another 535 RA5 build for a guy out west. Super fast street car on pump gas. It's probably making around the same power as Judes deal. I think the car weighs around 3500 so should go low nines high eights in the 1/4.. I may never know though, because he's a street racer and doesn't like to share times or numbers.

The heads are coming into their own Don, its nice to see. With all these higher HP builds going on, is the head gasket being routinely changed a thing of the past now ? Goal achieved ?

[pastry_chef]

I thought Pontiac head gaskets were only an issue 1050 ~Ish HP and higher.. Never heard of 9something HP having an issue.

[Region Warrior]

Originally Posted by slowbird

I think John is referring to this sheet

Nice!
Suprised that baby cam made that much power.
Guessing will needs larger headers too...

[slowbird]

Originally Posted by Region Warrior

Nice!
Suprised that baby cam made that much power.
Guessing will needs larger headers too...

At .900+ lift it isn't all that baby. It is good results with plenty to come im guessing

[slowbird]

Originally Posted by pastry_chef

I thought Pontiac head gaskets were only an issue 1050 ~Ish HP and higher.. Never heard of 9something HP having an issue.

Dragncar is in the know, so he knows what issues there are

[Region Warrior]

Originally Posted by slowbird

At .900+ lift it isn't all that baby. It is good results with plenty to come im guessing

Don't know the entire build.
Has .900 lift now? Or flows 450 cfm @ .900?
Know its not a baby, and not a max effort build, maybe just conservative side?
Seen 272/288's in E-heads that flow 330 cfm...

Thanks.

[Dragncar]

Originally Posted by slowbird

Dragncar is in the know, so he knows what issues there are

pastry_chef is a honorable poster and one smart guy. He meant no disrespect by his post. But you come along.....
My question was in general. This is a fairly high HP build and there has got to be others higher. Wondering how they were doing with head gaskets. So I asked.
Heads I have were changed every 25 passes but it was sprayed too.

[Kevspontiacs@aol.com]

Don is that Cris Uratchkos intake?