I ran across an old Car and Driver (Sep. 2004) Bonneville GXP test, and found the numbers compared to the GP (C&D, Oct. 2005) interesting:
curb wt. 3630 3940
final drive 2.93 3.70
top gear: .70 .68
engine: 325 c.i. ohv 279 c.i. dohc
HP [email protected] [email protected]
TQ [email protected] [email protected]
0-60/100: 5.7/14.8 6.9/19.0
1/4: 14.3 @98 15.4 @ 91
70-0: 174' 187'
G: .82 .79
When I started looking into these cars quite some time back, the bad news I kept hearing about the Bonnie's Northstar definitely turned me off that package. A Bonnieville SC 3.8 would have been a good package.
Why GM didn't use the 325 c.i. in the Bonneville GXP is a mystery to me, it's just IMO a shame they went with lower power and more "sophistication" vs. a better mill.
The 5.3 puts out up to 320 HP and 340 TQ in various truck applications. Granted, the GP mill is a somewhat modified 5.3, but those are good numbers for a Bonneville GXP.
And so go...The Days of Our Lives. Or Water Under the Bridge.