[*67firebird*]

I recently purchased a pair of heads off a fellow PY member. They are 7k3 heads 96cc and ported, but I do not have any flow numbers. I have a set of pictures of the ports.

My current combo is listed on my SIG.

With the new heads I would like to upgrade 2-3 things while the engine is out of the car.
1. Camshaft
2.Torque Converter
3. Intake

I calculated a Compression Ratio of 8.25-8.5:1 with the new heads. Which I understand to be pretty low CR, but will still be a beast. With that said I'm thinking one of these cams would work good with my combo

http://www.summitracing.com/parts/cc...w/make/pontiac
Or
http://www.summitracing.com/parts/cc...w/make/pontiac

I chose these cams only because Im not even sure where to start, I know many recommend Crower, UD, Comp Cams, Crane, Lunati.
I havent made up my mind between Solid/Mechanical/Hydraulic. ( I need to do some research to really understand the differences between these.)
But I am trying to stay away from the flat tappet cams.

I plan on using 1.65 rockers with whichever cam I go with.

As for the torque converter i think something above 3000 Stall would work Suggestions/ considerations welcomed.

Lastly the intake, I currently have the Performer RPM, but with the new heads and cam im thinking the Torker II might be a better decision, once again some input would be appreciated.
I dont know how much HP to expect from the upgrades, but my goal is 1HP per cuin.

Any help would be appreciated.
Thanks,
Oz.

[screamingchief]

First one is a solid roller and it aint gonna work with the springs in those heads,so scratch that one right off the bat.

The second cam is a HR,and yeah the 995 springs can work with a HR cam if set-up properly,but that's a pretty big HR for an engine with the CR you stated,even their info says 9.5:1 CR is needed w/that cam.

Which begs to ask the obvious question,just how did you come up with that CR for your combo?

I ask because 96cc heads on a typical 455'ish shortblock is usually in the 9.0:1-9.5:1 CR range.

Anyhow,the converter,the HR cam you listed would probably need more than a 3000 stall,ask me it's more like 3500+ would be needed IMO,so yeah I think their converter suggestion is "off" on that cam.

RPM vs. TII deal is a wash,not enough difference to worry about IMO.

I dunno what to suggest yet,not to confident in the CR info till I know more,but I would suggest that you dial back the cam choice ever-so-slightly regardless.

It wont take a cam that big to get 1:1 hp/cid outta this.

FWIW

Bret P.

[*67firebird*]

Brett thanks for the honest response the reason I have such a low compression ratios because I believe I have a 22 or 26 CC dish pistons. Once again I have to measure. my paperwork from Butler performance only shows the compression ratio I needed to get 9.5 with my number 62 heads 72 cc. So with 96cc heads it puts me in the low 8.25:1.

I know its low CR and I can mill the heads to increase CR. I've been playing with the idea if boost or No2 so id rather leave the CR where its at. I will be taking the heads off this week so I can measure thepistons
should I use a different profile can chat for that low compression?

With that said I'm glad I won't have to change out the intake or the torque converter.
Thank you. Oz

[Blued and Painted]

Stay with the xe 274 if it's not wiped out.

[Blued and Painted]

I dont understand why you want to de-tune your engine. And what about headers?

[*67firebird*]

B and P, dang that hurts.
1 3/4 super comps. 3" ehaust, going for X-pipe with magnaflows.
Currently have 2 1/2" flowmasters. way too loud for enjoying a drive.
Can you explain how im de-tuning? Because of CR? or the Cam? Im only trying to upgrade and if the general consensus is that I'm de-tuning, then please elaborate.

I thought that Solid/HR cams will loosen up some HP. And the higher the Rated Duration the more air/fuel mixture that goes into the chamber, right?

I Now have my eyes on another cam:
CCA-CL-51-433-9 -Cam & Lifter Kit -----288/294 236/242 ------.520/.540-----110 L.S.
Butler Performance website

OZ

[GOAT WHORE]

Originally Posted by *67firebird*

I thought that Solid/HR cams will loosen up some HP. And the higher the Rated Duration the more air/fuel mixture that goes into the chamber, right?

OZ

Long duration helps fill the cylinders at high rpm you need the heads to flow to get more mixture in at all points.
The head swap makes no sends to me. Even if you mill them to get back to the cr you have now it is still a step backwards as the 7K3's don't have all the bolt holes needed for headers.

[Blued and Painted]

dont think i would re-engineered a Butler botom end and head combo. Altho for street cars, i question some of there cam recomendations.

IMO, get the 62's set up for a roller.
The cam below will show some serious attitude. To big for me but im an old fart.

How will the car be used?

[Blued and Painted]

I try to keep my nose out of the race section cause these other guys are way way more experanced on race stuff. But if your fly is open I,ve got to say something.

[screamingchief]

The CR drop screws you in terms of cam choice freedom,it really limits what cam will actually work and what wont.

Even though the heads are ported and flow better,the CR drop just kills the cam options to cams that are much smaller than those mentioned thus far.

And that kinda kills the whole need for a HR cam too,though there are still other obvious benefits to them.

Most all the cams mentioned thus far are recommended for 9.5:1 & up engines.

FWIW

Bret P.