[STEELCITYFIREBIRD]

Be sure to record audio/video during the pulls.

[OCMDGTO]

Who ported the heads? I'm very interested to see what it does, more so in the car w manifolds, as in time slips. Jack knows what he is doing, he built my 400 & I have no complaints. You ever go to any of the Royal GTO events out there?

[grivera]

Originally Posted by OCMDGTO

Who ported the heads? I'm very interested to see what it does, more so in the car w manifolds, as in time slips. Jack knows what he is doing, he built my 400 & I have no complaints. You ever go to any of the Royal GTO events out there?

The heads were ported by Butler. I have yet to go to one for of the Royal GTO events or any others for that matter as I've been out of commission for so long.

[ponjohn]

Originally Posted by Cliff R

I certainly hope it makes at least 514hp as we made that with unported KRE aluminum "D" ports at about the same compression, and a custom ground HR cam with 230/242/112 specs.

We've also built several with flat cams that had 230 @ ,050" duration and all made between 494 and 505hp also using unported 85cc KRE aluminum "D" ports......Cliff

KRE has been experimenting with cam profiles and they have gotten as much 545 hp from as cast D-ports.

[Cliff R]

No doubt. I was only comparing cams with the same .050" as the OP is going to use here. I'm sure with larger cams and 260cfm head flow 545hp wouldn't be difficult.

The limiting factor here will be the camshaft. 230 @ .050" in a HR profile isn't a very big cam for a 455 build with 10 to 10.5 to 1 compression. We use 230 @ .050" HR cams in 455 HO and SD builds with 8.5 to 8.8 to 1 compression and they idle nearly smooth and make great power......Cliff

[grivera]

Dyno day is Saturday. FWIW, sometime ago when I was first contemplating an upgrade to the ported e-heads Dave (SD) estimated 525-530 hp.

[Cliff R]

Good plan as it gives you room to grow. We already know the larger OF cam is a solid 550hp with 295cfm heads and 10 to 10.5 to 1 compression.

I'm hoping the smaller SP cam will have enough seat timing to support the ported heads, and why I estimated that it would fall between the 514hp we got with a 230/242/112 cam/unported heads and the 552hp we saw with 295cfm and the OF grind.

I also read someplace that the SP is offered in several versions, with XE and Magnum lobes. Not sure which one you are using but it will effect the results. I didn't see rocker arm ratio mentioned either?......Cliff

[Steve C.]

The Stump Puller with magnum lobes has .3770" lobe lift or .565" lift w/1.5

The 'revised' version with XE lobes is .3890" lobe lift or .583" lift w/1.5

On the intake side the revised version has 5 degrees less seat timing.

His signature states .565" lift.



.

[Cliff R]

Steve, what are the .006" seat timing specs for each cam?

[Steve C.]

From what was passed on to me the 'regular' SP uses lobes 3111B & 3122B
286/289 rated at .006" tappet lift
230/236 at .050"
.3770" / .3800"
112 LS

From copy of a cam card on hand the 'revised' version used lobes 3194/3196
281/287 rated at .006" tappet lift
230/236 at .050
.3890" / .3910"
112 LS / 107 ICL

( Note: I've seen reports the original has both 5 degrees or 4 degrees advance ground in. And note the revised version does not use a "B" suffix code that can alter the rated duration slightly)


.

[Mook]

Hey Will did Jack mention the Howard cam he has been using lately? I think it could wake that combo up..... Even with 9:1(daily driver with a/c) or so compression my 67 400 with stroker went north of 530HP with 600plus TQ.....first pull with the same 850cfm carb straight out of the box..at the Dyno...... it will melt the tires...... Even though I Don't have full throttle......

[Steve C.]

Also worth mentioning the 'revised' SP has 5 degrees additional degrees of duration at 0.200" valve lift. Couple that with the higher valve lift and it will have more area under the curve.



.

[grivera]

Originally Posted by Cliff R

Good plan as it gives you room to grow. We already know the larger OF cam is a solid 550hp with 295cfm heads and 10 to 10.5 to 1 compression.

I'm hoping the smaller SP cam will have enough seat timing to support the ported heads, and why I estimated that it would fall between the 514hp we got with a 230/242/112 cam/unported heads and the 552hp we saw with 295cfm and the OF grind.

I also read someplace that the SP is offered in several versions, with XE and Magnum lobes. Not sure which one you are using but it will effect the results. I didn't see rocker arm ratio mentioned either?......Cliff

Cliff - The engine has HS 1.5 rockers and the SP cam has these specs:

Magnum Lobes 3111B & 3122B
.3770" / .3800"
286/289 rated at .006" tappet lift
230/236 duration .050"
.565/.570 lift
112 LS
Degreed at 107.5 ICL

Originally Posted by Mook

Hey Will did Jack mention the Howard cam he has been using lately? I think it could wake that combo up..... Even with 9:1(daily driver with a/c) or so compression my 67 400 with stroker went north of 530HP with 600plus TQ.....first pull with the same 850cfm carb straight out of the box..at the Dyno...... it will melt the tires...... Even though I Don't have full throttle......

Jack did mention it but I already had the SP cam. That Howard cam sounds decent. He said it has 242/248 @ 50 with about 540 lift IIRC.

[JLMounce]

Interested in seeing what your engine does. I went with as cast KRE D's on my 462, but my cam is slightly larger. 232/238 .543/.538 using XFI lobes.

I'm going to guess you're going to be in the 530-540 range and around 580 ft lbs.

[Mook]

Originally Posted by grivera

Cliff - The engine has HS 1.5 rockers and the SP cam has these specs:

Magnum Lobes 3111B & 3122B
.3770" / .3800"
286/289 rated at .006" tappet lift
230/236 duration .050"
.565/.570 lift
112 LS
Degreed at 107.5 ICL



Jack did mention it but I already had the SP cam. That Howard cam sounds decent. He said it has 242/248 @ 50 with about 540 lift IIRC.

May be I'll bring the car by sat......yes I understood you had the cam already, I been in that situation also. I learned sometimes I have to take a step back to go forward. I tried to mimx parts form one builder with another builder..... Both had different opinions...so I settled on the idea of telling the current builder what I wanted to do with the car and went from there. I did eat some parts but it was worth it in the long run.....Lucky for me Jack over built, so as my budget increased making upgrades was easy.... My guess with your set up would be 535HP .....

[grivera]

Originally Posted by Mook

May be I'll bring the car by sat......yes I understood you had the cam already, I been in that situation also. I learned sometimes I have to take a step back to go forward. I tried to mimx parts form one builder with another builder..... Both had different opinions...so I settled on the idea of telling the current builder what I wanted to do with the car and went from there. I did eat some parts but it was worth it in the long run.....Lucky for me Jack over built, so as my budget increased making upgrades was easy.... My guess with your set up would be 535HP .....

Would be nice if you came by Harshman's Automotive on Saturday!

The SP cam should be no slouch and very streetable, which is another reason I kept it. Not saying the Howard cam isn't, or the OF for that matter but the rest of the combo may compliment the SP better...

[JLMounce]

Originally Posted by grivera

Would be nice if you came by Harshman's Automotive on Saturday!

The SP cam should be no slouch and very streetable, which is another reason I kept it. Not saying the Howard cam isn't, or the OF for that matter but the rest of the combo may compliment the SP better...

I think if that's what you're after you're going to be pleasantly surprised. My combo is docile. It'll idle at 600 rpm smoothly and produces 12.5" of vacuum even at 5000 ft of elevation.

Put your foot in it and it screams.

[Mook]

Originally Posted by grivera

Would be nice if you came by Harshman's Automotive on Saturday!

The SP cam should be no slouch and very streetable, which is another reason I kept it. Not saying the Howard cam isn't, or the OF for that matter but the rest of the combo may compliment the SP better...

I agree, the entire combo needs to be taken in to consideration. As long as the weather holds up, I will be there.....

[Cliff R]

"Cliff - The engine has HS 1.5 rockers and the SP cam has these specs:

Magnum Lobes 3111B & 3122B
.3770" / .3800"
286/289 rated at .006" tappet lift
230/236 duration .050"
.565/.570 lift
112 LS
Degreed at 107.5 ICL"

Good news as it will make more power than the 281/287 @ .006" version. W/O high ratio rockers and ICL at 107.5 it will make less peak HP than my first estimate, but still easily over 500hp and 575tq.....Cliff

[slowbird]

Originally Posted by Cliff R

Good news as it will make more power than the 281/287 @ .006" version.

Are you saying that based on the fact it has more duration @ .006?
Why would SD change the lobes to 281/287 if it didn't make more power?