cam spec sheet question

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Sep 7, 2011 | 07:30 AM

#41

1963SS

Drifting

Joined: Dec 2007

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From: Argillite KY

Yeah, I agree. Skru the Patriot springs. I'll probably go back with a set of K-Motion. I know they work. Thanks for the suggestions. The isky tool room stuff is real pricey for a 6500 RPM engine with around .600 lift. That shouldn't be too hard to control.

Sep 7, 2011 | 07:54 AM

#42

87 vette 81 big girl

Melting Slicks

Joined: Nov 2008

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Quote:

Originally Posted by 1963SS

A Pontiac 455 punched .030" to a 462ci is just starting to wake up at 6,500 RPM's with a good set of factory cast iron heads.

6,500 in a sbc 383 (388ci) stroker is still asleep too.

Will run good though at 6,500 RPM's.

Sep 7, 2011 | 08:08 AM

#43

1963SS

Drifting

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From: Argillite KY

Thanks Brian, that's what I thought. This is the Impala engine and not the Vette. The Vette is going to be the RPM champ. On the Impala I need enough bottom end to get that 4350# pig rolling. It's only got 195cc heads but they are flowing 290/208. It's probably not impossible but it would be interesting to design an engine for a whole lot of bottom end torque and a bunch of high end horsepower but I'm sure it's not in the budget.

I'm building the Vette and the Impala engines at the same time and that's taking a toll on my wallet. All good stuff in both.

Sep 7, 2011 | 01:30 PM

#44

GREGGPENN

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From: Overland Park Kansas

2020 Corvette of the Year Finalist (appearance mods)

C4 of Year Winner (appearance mods) 2019

Quote:

Originally Posted by 1963SS

With no disrespect to Lloyd, the Patriot Gold springs that I put in 12000 miles ago are toast.That was running a Comp XFI 280 cam.

I offered Lloyd's prediction since the OP's cam was very similar in ramp rate to mine. In fact, it's probably milder due to it's longer duration. Those XFI's are more dramatic. Most everyone involved with performance parts pegs those cams as hard on springs.

I don't think the OP's will fail that quickly. OTOH, I would never recommend to ignore that possibility.

Sep 7, 2011 | 10:49 PM

#45

87 vette 81 big girl

Melting Slicks

Joined: Nov 2008

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Quote:

Originally Posted by 1963SS

Its possible to have the best of both worlds.

Low end torque & High RPM power.

Has to be done with moderate Cubic inches to big CI, Intake tuning, & exhaust tuning, with carefully chosen camshaft.

Not sure any current cast EFI for a C4 fits the need though.

Definite no Big tube headers available for a C4 out of the box.

2 engine builds at the same time.
WOW.

Can get expensive Yes.

Got your PM.
That is bad news about Mahle.
Go Diamond or JE pistons.

Never used Diamonds but people have told me they are very best for some time now.

Sep 8, 2011 | 12:51 AM

#46

GREGGPENN

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From: Overland Park Kansas

2020 Corvette of the Year Finalist (appearance mods)

C4 of Year Winner (appearance mods) 2019

Quote:

Originally Posted by 87 vette 81 big girl

Go Diamond or JE pistons.

What about SRP? I think JE and SRP are part of the same company now. Specs on the lightweight SRP stuff looks very

Sep 8, 2011 | 12:58 AM

#47

cv67

Team Owner

Joined: Oct 2004

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From: altered state

St. Jude Donor '05

Diamond is decent stuff

Probe, I was suprised nice, too. Tolerances on those are very precise and consistent

Sep 8, 2011 | 05:46 AM

#48

1963SS

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From: Argillite KY

The good thing about Diamond is that they will make engineering changes for something like 6 bucks a piston. If you want a 12 cc dish instead of their stock 18 no problem. If you machinist got your bore a little oversized and you want a 4.035 bore piston......6 bucks extra. That's kinda hard to beat for the price.