It took a little while but these bad boys finally showed up. They come in at 407 grams. So I'll still have a stupid light BW.

We're shooting for around 15-15.5:1 with these. It's a shame these have to go inside an engine.

Here is the old one next to the new one.

VERY nice. How fast did you end up going with the old set-up and can you tell us about your build.

Best mph was 143, and I never got it to stop spinning off the line.

New build is destroked .047, and the compression is bumped up around 3.5 points. Looking to push it over 950hp closer to 1000 NA. We figure it should add around 80hp, I'm hoping for more.

This year the suspension is done right. So it should hook and book. Before almost everything was wrong with the rear suspension.

I posted videos last fall and fixed pretty much everything the guys seen. I haven't put sliders on yet. But it's on my list.

Good-luck on the new build. What RPM were you shifting and trapping at on a 1/4 mile pass?

I was shifting at 9100 and trapping 9300. I had mufflers and air cleaner on, it was keeping it from revving to its full potential.

On ice with no air cleaner and open headers it would rev to 9800 without issue.

They are beauty's! Gonna work over the sharp edges at all?

That's what I was thinking. I was offered a pretty good deal but passed because of budget limits. RPM costs money and with my race schedule it would make those un-affordable.

What cam is in that motor?
Seems like a lot of rpm.
Friend ran one, 3000 pound car, also went 143 mph.
Shifted it at 8k, and didn't run any better raising shift points.
Bush restrictor plate motor, 12 to 1, 248/258 cam

They look great, lots better then my JEs

IN
304 @ .020
271 @ .050
.437 Lobe Lift

EX
312 @ .020
279 @ .050
.441 Lobe lift

I am using a 1.83 rocker.

I'm going to experiment with shift points once I get it to the track this year. Last year I was just doing what I did on the ice and got those results. I think i hooked better on the ice too lol

Despite how they look in the pics, there aren't any sharp edges they are all machined with a radius. Ready to drop in

That's a LOT of compression. I have to ask, who advised you that raising the compression over 3 points is really what this motor needed for YOUR application. I expect that if you are looking for 80hp or more with just a compression change, you are likely to be disappointed. Plus, using a motor with a Comp Eliminator power curve, in a fairly heavy, small tired, car with an auto................mmm, don't know.

Lot bigger cam..... Probably does like that rpm... Lol
Sweet looking slugs, how expensive is the ring pack?

Well, the NASCAR engines were pushing towards 18:1 IIRC, so 15.5:1 should be doable.

But shame on you for posting pornography on these pages! I get excited just looking at the pictures.

R.

The engineers at diamond designed the piston to what they thought would be the max compression to be effective. It may not be 3 full points.

Kent Ritter picked out the cam for me. He thought it would be good with the heads and intake I have.

Well if it doesn't make much more power I'll have to get a different grind to help that I guess.

It's ran in the 9s already and it was tired then and you seen the video of how bad the suspension was setup.

1mm 1mm 2mm ring pack, $145

Good luck. Bob ran 5.82 shifting around 8000 with a 904. Broke it due to an incorrect rocker length. He ordered JE billet dome pistons hoping for more hp.

I assembled and ran a glide. It liked shifting at 9200. But, ran the same et and mph. I talked with several builders of R5 engines. They all found domes to slow the engines down.

Hopefully you will have better luck.

Compression wrecked Bobs engine due to the wrong rocker arm length? Or just the rocker length in general?

This engine was already running, I put over 2000 miles on it. Just refreshing everything now. Only change is a little less stroke and compression ratio.