Help Me ID These V6 Cams Please!

**fetta78** · #1 (**permalink**) 03-31-2008, 05:19 PM

I aquired these cams this past weekend, they are new in the Crane box with this spec sheet.
Can anyone help me figure out if these are worthwhile cams and what would they fit? Worth anything?
I'm guessing I can't make them fit my 86 Spider with a 4 cyl can I ??

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sh0rtlife · #2 (**permalink**) 03-31-2008, 06:18 PM

they just cheep junk..send them to me so i can scrap them right away :P

i have no idea on them..but if there crane there probably pretty good

**Alfar7** · #3 (**permalink**) 03-31-2008, 08:46 PM

From the spec sheet you can Identify that they are :
1) Regrinds. To get to intake lift of .450 from .358 is going to require a minimum base circle reduction of at least 1.5mm (.060) or placing it in the 1.020 range (down from 1.080) This will require .030 thicher shims on average than existing ones. As well there is not adequate clearance for this valve lift. (need shorter retainers and cut down guides deeper in head for seal clearance, or no seal)
As to exhaust the same reduction would have to be removed from the base circle. With lift larger than the intake (.497??) there is inadequate clearance in stock heads for that amount of valve lift. (cut down guides & retainers with no seal)
Worse, the rockers are going to have a difficult time living with these lift amounts, made worse by small base circles.
2) Overlap of 106 degrees?? This is so far above what would work at anything other than 6000 RPM up that it is absurd. Check other builders overlap data for full race cams. They will never work with FI other than a custom programable race system. Then you have the rocker problem with high lift cams as they will not live at high rpm with out special ramp design and moderate lift. And adequate for the exhaust is around .425 on a full race motor.
Old (period in time) Shankle Race cams for the V6 had 52 degrees overlap lifts of .450 &and duration at .050 of 275 degrees, exhausr lift of .425 with 250 degrees duration using faster intake ramps & more moderate exhaust ramps that were breakers as well. Rating of "13" on someone`s "comparative" scale.
Post a pic and maybe more can be told of the upper lift design.

Greg Gordon · #4 (**permalink**) 03-31-2008, 09:13 PM

Richard, Are they welding up the lobes? I don't see how they could grind enough off the bottom of the lobes to get that much lift, there just isn't much extra meat there.

**block** · #5 (**permalink**) 03-31-2008, 09:21 PM

Quote:

Originally Posted by sh0rtlife

they just cheep junk..send them to me so i can scrap them right away

Ozalfaracer · #6 (**permalink**) 03-31-2008, 10:16 PM

Mark: Sounds like someone's cleaning out the basement. I brought them from Vick Auto years ago, when I got them I realized they were pretty much useless. They've had so much ground off the base circle I don't think you could get the cam followers anywhere near the lobes without running shims that were 10mm thick. I can't remember why I didn't send them back, as I said it was about 6 years ago now. I ended up using a copy of the cams that Don put in Kates old GTV6 which became Paul's car. I had them ground by Delta cams in Seattle (the guys that Wes uses). For what it's worth, the specs are almost identical to an old cam used by General Motors Holden on the limited edition "Bathurst" XU1's back in 1973. A great cam in those cars, useless for the Alfa. I have some suggestions about what you could do with them but I don't want to spend any more money on lawyers. Cheers, Rick.

**fetta78** · #7 (**permalink**) 04-01-2008, 10:46 AM

Thanks Richard, I wish they were usable...........

Hey Rick, ya want me to send 'em to ya? Sell em to one of them Holden guys down there??
I guess they would make a nice lamp stand or lawn decorations...Oh well.

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