[jerry455]

A friend of mine is putting together a 455 +.030", good aftermarket rods, mildly ported 197 heads, 455 HO intake and a super duty Q Jet. It is going into a 1968 Firebird with a manual transmission. He has the cam but was not have the cam card. Anyone have a card they can post a picture of? How does everyone like this cam? Just wondering what to expect. Rear gear has not been finalized yet. This is a solid roller camshaft. He was wondering about anyone's experiences were with this cam. I tried searching but there were only a few comments about it. I think it is a pretty popular cam, but I might be wrong. Thanks for the feedback.

[Steve C.]

https://www.compcams.com/magnum-243-...5-455-cpg.html

Lobe number 1476 on page 66 here:

https://images.carid.com/comp-cams/i...ct-catalog.pdf

The cam has 68 degrees overlap




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[steve25]

It should work well with 3.42 or so rear gears.

You did not mention the compression but I hope it will be over 9 to 1.
I will venture a guess that it will want to idle at 1K so it’s good it’s a 4 speed.

[blueghoast]

I'd run a 3:73 gear with the 4-speed as long as your not gona be on the
highway a lot, That's mostly the gear I run in my cars, Auto or Stick.
Though the 3:42 is an all around good gear too.

GT

[Gach]

Its a single pattern cam, not really ideal but should be ok. Hey he’s got it use it.

[steve25]

I would bet that a mild home porting job got the exh side improved more then the intake and then factor in a 3 to 5 percent gain on top of that from running headers and single pattern cam should not be a issue.

[jerry455]

It is going to have headers. I don't remember what the compression is going to be, but it is going to be as close to 0 deck as he can get, custom pistons, I don't remember which ones.

[Cliff R]

I've been several 455 HO and 455 Super Duty engines at or near the stock compression ratio.

I would NOT under any circumstances use a 110LSA cam in one unless you really get some "squeeze" in it. I'm working with a customer right not that put a Comp XE cam in one that's of course on a 110LSA and he absolutely HATES everything about it.

I try to get those builds up to 8.8 to 9 to 1 with decking, squaring, thin head gaskets and two valve relief pistons. To effectively flow the big round port heads you need some duration, nothing under 230 @ .050" is going to make the grade for sure or it'll be done before you hit 5000rpms. Without some compression tight LSA just isn't going to cut it, at least if it's going to be a "street" car and you want good vacuum at idle, strong power right off idle and in the "normal" driving range, etc. In any configuration it's going to make PLENTY of upper mid range and top end power, even with your 244 @ .050" cam on a 110LSA, it just woln't be as friendly as it could have been for daily use.......FWIW......

[Steve C.]

Comp Cams 288R - Any combos out there?

https://forums.maxperformanceinc.com...ight=Comp+288R

Some Comp XE solid roller combos here:

https://forums.maxperformanceinc.com...ight=248%2F248


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[Stan Weiss]

Originally Posted by steve25

I would bet that a mild home porting job got the exh side improved more then the intake and then factor in a 3 to 5 percent gain on top of that from running headers and single pattern cam should not be a issue.

Steve,
The numbers that I use are based on no pipe. If using exhaust numbers with a pipe, then why not look at the reduced intake flow numbers with the intake manifold attached?

Stan

[steve25]

Jerry did not mention what his buddy was running for a intake, maybe the stock aluminum HO one which is known to be a close to a restriction with these heads.

Mostly what I am saying is that the exh side on these heads rework easier then the intake with the way a first time porter goes about things, not to mention that many times such a rework by a novist reduces intake numbers in the mid lift range and the mildly increase of high lift numbers can’t make for the losses.

[Stan Weiss]

Originally Posted by steve25

Jerry did not mention what his buddy was running for a intake, maybe the stock aluminum HO one which is known to be a close to a restriction with these heads.

Mostly what I am saying is that the exh side on these heads rework easier then the intake with the way a first time porter goes about things, not to mention that many times such a rework by a novist reduces intake numbers in the mid lift range and the mildly increase of high lift numbers can’t make for the losses.

Steve,
What length pipe do you use when you flow the exhaust?

Stan

[jerry455]

He will be using an original 455 HO intake; I think it is a 1971. He will be ordering parts for the Q jet from Cliff.

[Steve C.]

"We have that cam in a 455 with 71 HO heads, stock intake and q jet. I don't know if there has been any work done to the heads but it runs very well."
Jack Ferris
RestoRacing LLC
www.restoracing.com
Sandy, UT

Within the link I posted here.

Side topic: If hood clearance issues consider a worked Holley Street Dominator intake or Tomahawk intake.
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[Tandyman]

This is my cam card. Used this cam for over 30K miles. Great street/strip cam.
Enjoyed every mile . It replaced a 294b 234/244 /1.65 rhoads . Idled just as smooth with less cam sound but was no faster
Glenn

Attachment 627977

[Tandyman]

Trying again

[Formulajones]

Interesting how this similar combo still pops up occasionally.
I did a 71 455HO build 3-4 years ago with the 197 heads ported by dan Barton, Paul finished them up and on His bench went 285-ish. Stock HO intake and an 73 SD carb with Cliff's kit in it. Compression was 9.9:1 with a custom dome piston. Cam was a custom hydraulic roller from Paul using voodoo lobes 239/243 @ .050 and .630's lift with a 1.65. it was on a 112 lsa.
It made 507hp/571tq. And peaked around 5700. That was with the stock RA manifolds in place.
That engine also had 13+ inches of vacuum up here at 5000 ft and ran the power brakes and ac just fine.