Shorten exhaust cam.

Does your EFI have a cam position sensor? This is where mine is installed.

 

I was going to cut mine, but saw that hex plug at the end of the cam, inside the fine threads for the aux air pulley. So, I stopped and fabricated a simple Delrin plastic thread cap. Would removing the hex plug at the end and measuring the hollow depth help determine how you cut?
Image Unavailable, Please Login

 

Cam is hollow all the way thru... So if you cut it you'll have to tap it for the plug.. metric taper threading... Yes that exists, oddly.

Might actually be easier to fabricate a cover that mounts to the head and cover or uses an 'o' ring grove and is pinch fit into the space. Just a thought.

 

Right! and that center hole is not just for lightness, it is part of the oil system. Oil feeds into the cam and then holes in the cam feed all the cam bearings....please don't cut it

but it you must ( I do understand wanting the engine to look its best) you might be able to beat in and Loctite in a plug....the cam is pretty hard, not sure you can tap it....a tack welded plug probably would work.

 

Tolerances are really tight on the cam journals, risky welding the cam, very high probability of warping. Caution that course.
Good point on the hardness...
Safe option... Don't cut in my opinion.

 

What do most people do when they put those alternator blank covers on when goin to a direct fire ignition?

they aren’t buying new camshafts, are they?

 

That is an air pump drive isn't it? Most cars don't have that to start with I don't think, different cam part number.

 

If you still have the original American emissions cams I strongly recommend switching to the earlier cams or modern profiles from Web cams in the US or Cat cams in Belgium. Looking at the work you have already done, it seems a shame to put back the emissions cams.

 

That's true about P6 cams with carbs as the carbs just won't work very well, but with EFI most of the issues go away...although if you are planning to use an MAF if still may be a concern as they don't like flow reversion any more and cars do. But I think Derek's point was that us 76-77 or 76-79 euro carb cams are not P6 but still much better than any CIS cam or the 78-79 US carb cams, I think I have the years right but for sure all the CIS cams are just terrible and what drove the switch to 4V that works better with very short duration cams. A better OEM cam upgrade should bring you 20hp or so, aftermarket grind 20-40 probably.

 

Those are most excellent numbers

 

Speaking of salvage - what about sourcing a Euro-spec exhaust cam to replace that US cam? No air pump extension on the end of the cam - it comes shortened from the factory. Then you can use the factory flat cam end plate cover.

 

the specs you posted are very good, but they are not OEM specs I don't think? Are those a Web regrind option? A regrind means they use your cores so the extension stays.

Cat cam is making new blanks I think so you might want to see what they offer too as that might get you a nice grind without the silly extension (which to be honest, as much as you hate it now, you'll really never notice once the engine is done and installed)

 

Tommy, there are loads of the crap cams out there, I have two sets if anyone needs some cores to regrind. CAT have several grinds and a complete new set (no core or exchange is about $1500.) I went with the 402 fast road set. I wouldn't use the bigger ones with standard lifters but the 402 set fit ok. I have titanium valve spring retainers for £150 but contact Hans Sorenson at Spirit of Italy in Norway as he says he sells them for £50 (I only found out after I bought the minimum 10 sets :-( ) Here is the Cat cams link:
http://www.catcams.com/products/camshafts/datasheet.aspx?ENGINE_id=137&CAMSETUP_id=413&Language=english

 

Those are nice, not far off what I have in the V12. and by fast street you mean:
"FOR COMPETITION APPLICATIONS ONLY."

It seem a lot of lift for stock buckets? do they say its ok? the conventional thinking is stay under about 9.3mm lift or risk flipping out the shims.