I have a 91 Z28 w/ a 305 HO. I have the 305 HO from an 86 w/ the quadrajunk on it, b/c the previous owner decided that TPI was 'too hard to work on' (If I could have 5 minutes w/ him!!). Anyways, I have bought a Carter 600 CFM carb, a Holley Dual Plane Street Dominator intake, and Flowtech headers for it. I am using the heads off my 83 Z28's motor (416 casting, 1.94 int, 1.6 exh.), which have maybe 3k on them. I might try doing some polishing on the intake and exhaust ports before I put them on, just to learn. I will be using the Proform 1.6 ratio aluminum roller rockers on it, too. In the other 305 (before one of the rods took a vacation), I had used a Comp Computer Cam w/ 206/212 @.050, and .425 and 442 I think, w/ the 1.6 roller rockers, and CrossFire Injection. It ran much better than stock, but I limited the cam b/c of the computer. Since this will be carbed, what do you guys recommend for the parts that I have. It will see about 150 miles a week on the highway as my 'friday car' (I commute about 800 miles/week), and will see some strip time, but I want to make sure I can smoke those ricers when we go Honda hunting, so I am worried about going too big and losing some low end. I thought about something like an Edelbrock Performer RPM, or something similar....but is that too much lift w/ the stock style valve springs and 1.6 rockers? Is something around 214/224 w/ around .450/.488 going to be too much, or in the neighborhood? Emissions are of no concern. It is the 700r4, stock converter, compression ratio is about 9-9.5:1 if I remember correctly, and the gears are 3.23 or 3.42 maybe....I have only had the car about a month, so I haven't had the time to investigate everything too much. Cruise rpm at 75-80mph is around 2250 to 2500, I haven't installed the lockup solenoid yet, so I can't be sure. Also, that's w/ the speedo reading 65 (it reads 10mph slow...)
Also, I was thinking of putting the heads (416 casting#) off of my 83's 305 on it, b/c they only have about 6k on them and have the oversize valves. The #8 piston did smack the head when I lost a rod, but it doesn't appear that the valves are bent. The piston had an area where the carbon was 'scraped/knocked' off in the form of a valve. Do you think that this would be enough to crack the head? What kind of port work can be done with out removing the valves, and is it safe to rinse the head in a parts cleaner bath, or will that risk damaging any seals? Everything is brand new(6k) on the heads.
[ 08-02-2003, 12:11 AM: Message edited by: HawkZ28 ]