25 replies to this topic

[TerrA LX]

Anboby got any specs on the size and type cams that run in group c 308's

[Struggler]

When I purchased a cam from a previous owner of my Group C A9X I got a Camshaft Engineering grind. Can't remember the number but it was a Chevy Z50 copy, 254@ 050, 500 thou lift and 108 LSA - single pattern. Apparently it was the standard Bathurst race grind (not qualifying) around '77-78. It actually drove quite nicely.

Ron Spencer at Crow once told me about a grind they developed for Alan Grice in '83 (Dayglo VH c/dore). It had 264 @ 050 and about 580 lift on 106 - single pattern. He did warn it was a qualifying grind only. I had to have one !!!! I was severely disappointed. NO torque at all and needed the rings revved out of it to go, sounded awesome though !!!!

If your keen I can look up the part numbers, I have them written down somewhere.

[makka]

yes please Struggler!

[TerrA LX]

not looking for a cam so no suggestions needed, its a trivial question so any specs as above greatly appreciated.

Edited by ALX76, 09 June 2006 - 12:32 AM.

[Struggler]

OK, I have unearthed the specs for those two cams, my memory has faded after all these years, the Crow cam is heaps bigger than I remember (0.625 valve lift !!)

Both cams are single pattern (intake and exhaust lobes are identical)

Camshaft Engineering (Qld) - CE684A - 254 @ 050, 0.335" lift at lobe, 108 LSA, installed at 104.

Crow Grice stick - 5681 - 268 @ 050, 0.378" lift at lobe, 106 LSA, installed at 105

Like I said earlier, the Crow had a demonic idle but was way behind the CE until about 6000 rpm. Above 6000 rpm the sound from the side pipe was pure bliss.

[Struggler]

I also unearthed an old Wade catalogue..........

Hi ALX76, The camshaft you should get is a clive cam 629B it makes good HP and low down Torque approx 400 @ 6500 RPM, The other cam is the 729A ?? this cam will make good power and torque upto 7200 RPM both have big lifts and are serious race cams, call Ian Tate re spec's.

629B - 265 @ 050, 0.346 lobe lift, 100 LSA
789A - 276 @ 050, 0.347 lobe lift, 100 LSA, both are single pattern. (I assume valencia meant the 789A rather than 729A, couldn't find a 729A and the 789A is a popular grind with drag racers.)

I would suggest either of these cams would be extremely peaky due to their narrow LSA. I have driven a 326 stroker 308 with the 789A, it had nothing until about 5500, then it went like a champ. Ran 11.1 in a UC sedan with a 5500 convertor.

[makka]

cheers for that guys.
handy stuff to know. I thought some teams used an Isky cam in their cars, I could be wrong though

[Struggler]

I thought some teams used an Isky cam in their cars

makka, the Camshaft Engineering grind I spoke of is a Z50 copy, Isky made the original Z50.

[makka]

cheers Struggler

[TerrA LX]

[The cam in my L34 has the same specs, 264 @ 050 and about 580 lift on 106. It made 391 on Kim Bakers's Dyno. Standard Stroke, not bad ayy !!! Goes hard, just ask QIKSLR.

i take it that lift is on the nose not the valve. any sort of piston relief going on there?

[makka]

Haha, thats the way Dirty Deeds!

[Struggler]

I would assume it is at the valve.

If it was at the lobe valve lift would be 580x1.65=0.957" !!!!!!!!!!!!!!!!!!

[TerrA LX]

yeah fair call, should have realised that.
my fourm oppotunitys are late night early morning, still no excuse for that one.

thanx for all the info guys.

[Struggler]

what are they like for a street combo 308, i was planing on using a crane 286. Another thing is what would they work like with VN Heads and a big single plain?

Struggler when you say installed @ 105 are you saying dailed in at that deg.. Im not too technical on this subject.

All these discussed cams are fairly distant from street use (and all are solid lifter grinds). Stick with your plan of the 286 Crane.

If a cam is ground with an intake centreline angle of 110 degrees and it is installed at 105 then basically I am saying it was installed 5 degrees advanced. Just advancing cams for the sake of it is unwise, you should really be looking at where the maximum lift point or lobe centreline is in relation to the piston. This is why some cams respond really well to being advanced 6 degrees and others with similar 050 duration go backwards. Install according to the manufacturers specs and you can't go too far wrong.

[Struggler]

Very similar, you just have more exhaust duration which can give more top end power.

The Crane 288 solid is the most popular solid for 308's of all sizes, and for good reason.