Originally Posted by corvettecrazy
I have a cam question that is a little off topic but along the same lines:
If you were swap a mild cam into a L67 is it still reccomended to change the lifters, springs, timing chain, push rod etc??
We put an XP cam in the GTP, and we ran stock everything. We are still running the original timing chain and timing gears, and we are running the original lifters as well. The only thing we really replaced other than the cam was the timing chain tensioner. About 8k miles later the car is still running great. Before the cam we spun the engine to 6600rpms with no problems, and since we haven't had the PCM reflashed yet we still spin it to the same 6600rpms and still have no problems. But, springs are a must, I would never run an aftermarket cam with stock springs. We are running 90lb. springs with modified retainers (for the extra clearance) and OR pushrods in the GTP.
While I don't really recommend for people to change their cam and keep all those stock parts, it can be done with good reliability. The only reason we did this is because the car was fairly low miles (I don't remember exact miles, somewhere in the 25k range) so the parts were pretty new. On an older car with more miles I'd definately replace most of that stuff.
1990 Maroon Grand Prix STE McLaren 3.1 Intercooled Turbo, 14.695 @ 94.49 on 12psi before cam/heads/etc.
1990 Bright Red Grand Prix McLaren 3.1 Intercooled Turbo, 14.819 @ 92.72, 189whp
1999 Grand Prix GT 9.75:1|K&N|160 tstat|No Ubend/Cat/Res|UD Pulleys|Ported M90/TB/Heads|XPZ|2.55"|Pacesetters|Stage 2 I/C. 12.442 @ 112.78
2000 Blue Bonneville SSEi Supercharged Gutted Airbox|K&N|3.4"|1.9'*|WP Pulley|Custom DHP|180*stat|41932'*|No Cat. 14.681 @ 94.80
2002 Dark Cherry Grand Prix GTP Supercharged & Intercooled
12.084 @ 114.38 w/1.743 60', 315.6whp, Fastest Stock Cam M90 GTP!
NOW XP CAMMED, 340.6whp with XP, stock heads, Gen 3 M90, 11.984 @ 115.84 w/1.750 60'!
Most HP Stock Heads Gen 3 M90 GTP!
2004 Red Monte SS Supercharged K&N|3.4 Pulley|1.9'*|180*stat|41919 plugs|3" dp|No cat/ubend|DHP|Shift Kit. 14.2 @ 98
GOT BOOST??? Friends dont let friends drive stock!