^^ That's not very impressive. Something must have been wrong. Maybe a 6.5?
A 7.50 would equate to about an 11.70 quarter mile time, not real impressive but not too bad for a crate motor. A 6.5 in the 1/8 would equate to about a 10 flat in the quarter, probably out of his range. Heck, there are guys on this site with pumped up high compression 383's that can't break 11's.
Come on now, I think there a guy here with a little chevy II with a very mild 383 that runs 11s:yes:
No that was his real time, he said he thought cam & intake would do him wonders but he wasnt messing with it until the warranty runs out.
Same here. EFI though. I'll Dyno this summer.
Car Craft ran a dyno test story on a ZZ502/502 crate engine back in their May '99 issue. I was just looking at this issue a few days ago. Here is what they found on the dyno, including some jetting changes they did which might help you out:I just purchased a ZZ502 and it's advertised to be 502hp and 567ft lbs torque. I don't have it installed yet. I'm painting the block chevy orange. That black just isn't right in my opinion... It came with a holley 850 vacumn secondary. Guess I'll try it for a while but will probably end up running a double pumper on it
I know that this thread is old (2007), but had to comment on the dyno results of the ZZ502. The above dyno numbers from the Car Craft ZZ502 test are very real world numbers. Others posting higher test results on "stock" ZZ502 motors had better check their dyno operator. What was the dyno used? What standard is used SAE?Car Craft ran a dyno test story on a ZZ502/502 crate engine back in their May '99 issue. I was just looking at this issue a few days ago. Here is what they found on the dyno, including some jetting changes they did which might help you out:
GM Crate Engine ZZ502/502:
On another note, I was leafing through the leatest issue of Chevy High Performance tonight on the newsstand, and noticed Edelbrock's full-page ad about their "Top-end" kits. They have a complete kit with heads, cam, intake and carb for GM crate engine short-blocks. Up until this latest ad, it was all for small blocks, but what caught my eye is the new top-end kit for the ZZ502/502 short-block. With Edelbrock's single-plane 454-R intake, 24° heads and Performer RPM hyd. roller cam, they claim 611 HP. That's not too shabby I think.
- Dyno testing was done through 1 7/8" headers exiting through 5" truck mufflers rated at 400 HP apiece.
- Carb was the GM supplied 850 Holley
- HEI distributer
- Actual compression ratio of this engine is 9.2:1 - GM says it's 9.6:1
- Engine was found to not be knock-sensitive on 92 octane pump gas no matter how much total timing was used during testing.
- With the stock 850 Holley atop the GM dual plane intake using the GM-recommended 36° total timing, the 502 made 582.7 lb/ft @ 4000 RPM and 518.6 HP @ 5500 RPM. They noted the stock jetting was lean, so they bumped up the jetting from the stock #78 primary #82 secondary to #84 primary and # 86 secondary which produced the best power of all the runs at 586.3 lb/ft and 528.1 HP.
Agreed, 502 HP SAE is 520 stp correction. 520 is the number. The DTS should be 4-5 percent lower than our SF 901.
