68 Yellow 468

Hello,

I'm curious as to whether anyone with a GM 502 crate motor has had that thing dyno'd (Chassis dyno really).

Also, I would be curious as to what performance upgrades you have done and what the results were. Cam swaps would be of particular interest.

Regards,

Bryan

69ttop502

Bryan, my motor started as a 8.75 to 1 502HO Gen V crate with hydraulic flat tappet cam and iron rect. port heads. It made 355 at the wheels through a Muncie and stock rear end. I decked the block put SRP 10.2 to 1 pistons in, AFR 315 heads, solid flat tappet cam 258 @.050, .615 lift, out of the box Holley Strip Dominator, and Holley 950HP. This combo made 615. I have since added fully ported Vic Jr. and Had Pro-Systems rework the carb so I would think I am around 630 at the crank. Chassis dyno to come.

MELVINJ

Bry,'

I gotthe 502/502 long block. That is, the heads down to oil pan. I put on my own intake

I got the Edelbrock EFI, and it bolted right on

With headmans headers, motor out of car, on a dyno, the best I could pull was 547 hp. Whats great about this efi set up, is you can save 3 parameters. This is one of them I saved, plus a "economy" (highway) setting, and street setting

I changed NO internals

MassVette

Stock ZZ/502 (502/502) initial chassis dyno run on my '79-

420 RWHP............

68 Yellow 468

Great information guys!

69ttop502 - Nice numbers. I look forward to seeing those chassis numbers as well.

MELVINJ - Interesting. Looks like the 502 HP rating may be a bit on the conservative side. That's good news.

MassVette - Thanks for that tidbit. I will be quite happy if we get close to that 420 rwhp mark. What headers/exhaust are you running for that? Also, what rear end gear are you running?

B.

68 Yellow 468

What was the torque? Any chance you have a dyno graph you could scan and post???

B.

Tex71BB

Horsepower TV did a crate comparison a while back. The RamJet 502 made 400 RWHP in a '70 Chevelle.