GM building in 4° retard into their late model timing chains for emissions puproses.

For instance, the Comp Cams camshaft I bought is designed to be 4° advanced when the dots are lined up. However, doing this with a GM timing chain set will end up retarding the cam by 4°.



------------------
Pro-Touring 71

1996 LT4 Corvette Wheels are 17x8.5 front, 17x9.5 rear
Wheel adapters are 2.0" front, 2.5" rear
Baer Brakes four wheel discs
Fuel Injected ZZ4, custom burned EPROM, AFR heads, TPIS Mini-Ram intake,
Comp Camshaft, TH700R4 Transmission.
God Bless the USA
Project Photos on ULTM8Z project photo album (http://photos.yahoo.com/ultm8z)
See me in Chevy High Performance (http://chevyhiperformance.com/featuredvehicles/86018/)
ULTM8Z Website (http://www.ultm8z.com)

I think they always did??

I have read somewhere that some guys go so far as turn the STOCK, GM crank gear around, re-radius it and then install it to get back what was retarded...

That's one reason to run an aftermarket timing set to me..

Anybody else on this???

pdq67

No GM timing sets here after the stock pieces come out http://www.nastyz28.com/ubb/wink.gif