Has anyone else read that article? i just picked it up today. They used the RPM roller cam and made about 400hp and then added a RPM 100hp NOS shot and got 513hp. Now we all know that their dynos and the best and "most accurate" but how close would that package be in the real world?

That should be dead on what that combo would achieve. Very believable.

Thomas

Thanks Thomas. Since I`m stuck with small blocks and happen to have a couple 327`s lying around, the article was some really interesting reading.

Crane published a 327 dyno test around 1970, 250/260 degree Track roller, tunnel ram, ported "fuelie" style Chevy heads; made 440 ft. lbs torque. That number was attained by numerous lash loops and header tuning, but showed how important those two tuning phases can be. That's where dynos really shine.

i ran the perf rpm roller in a diff combo, with a procharger, really worked great
i have used the perf rpm package's b4, they work really well

Fwiw, I posted this over at Team Camaro.

"I just looked that article over a second time!!

They DIDN'T list the enigne's CR. as well as headgasket thickness!! I mention this b/c I figure that engine is only at like about 9.5 to 1 CR.?????

And I didn't find the advertised duration numbers EASILY for that hy-roller cam either..

I bet that cam really needs 11 to 1 CR. just like I figure the Performer RPM cam needs IF it is like a 288 or larger cam!!

Anybody have the advertised spec's on that cam so I can check??

pdq67

PS., an 800 cfm carb. on a 327 is a bit much, imho! BUT at least it is a vacuum secondary jobber which will help ...."


And a bit later................................

"A 308/318!!

Imho, a cam like that REALLY needs at least a minimum of 11 to 1 to run OK and probably 12 to 1 Would be great!!!"

pdq67

pdq, I saw that post over there but I thought that cam spec was for the regular rpm cam, not the roller. The guy that posted the specs listed the lift at .488/.510 and the roller is around .530 plus. I too noticed the lack of compression info and that it had a .023" deck height. I don`t think I would build the exact combo, I just thought I was a interesting article. It goes to show that even the little mouse can make big power.

Fwiw, I posted this over at Team Camaro.

"I just looked that article over a second time!!

They DIDN'T list the enigne's CR. as well as headgasket thickness!! I mention this b/c I figure that engine is only at like about 9.5 to 1 CR.?????

And I didn't find the advertised duration numbers EASILY for that hy-roller cam either..

I bet that cam really needs 11 to 1 CR. just like I figure the Performer RPM cam needs IF it is like a 288 or larger cam!!

Anybody have the advertised spec's on that cam so I can check??

pdq67

PS., an 800 cfm carb. on a 327 is a bit much, imho! BUT at least it is a vacuum secondary jobber which will help ...."


And a bit later................................

"A 308/318!!

Imho, a cam like that REALLY needs at least a minimum of 11 to 1 to run OK and probably 12 to 1 Would be great!!!"

pdq67

Here's additional info for you:

The advertised numbers are 296/300 and by the specs listed below, it came out to 9.2:1 compression.

Bore: 4.030
Stroke: 3.25
Chamber CCs: 64
Piston design: flat top w/4 valve reliefs
Valve reliefs CCs: 5.4
Gasket thickness: 0.041
Deck height clearance: 0.023

Hope that helps.

Here's additional info for you:

The advertised numbers are 296/300 and by the specs listed below, it came out to 9.2:1 compression.

Bore: 4.030
Stroke: 3.25
Chamber CCs: 64
Piston design: flat top w/4 valve reliefs
Valve reliefs CCs: 5.4
Gasket thickness: 0.041
Deck height clearance: 0.023

Hope that helps.

Thanks for additional info Henry.

By the way, your doing a great job with the Mag! :thumbsup: :thumbsup:

In my old hippy voice!!

"You gotta be sh-tting me!!" (Note the G on sh-tting instead of the n' and NO G!!!

A 296 cam in a 9.2 CR. engine!!!

Boy the mag's sure wanna sucker the guys that aren't into it as DEEP as I HOPE we all are here!!!

pdq67