[PAUL K]

Fantastic job! Well done!

[Skip Fix]

Good job!

[aaronman]

Fantastic! It was a pleasure meeting you and your wife as well!

[firechickenman]

Thanks guys!

Originally Posted by aaronman

Fantastic! It was a pleasure meeting you and your wife as well!

It was great meeting you and Bill!

[R 70 Judge]

Originally Posted by firechickenman

Some of you may remember that I had a crankshaft failure at Norwalk last year. It was an 11:1 .035 over 455. OE block and crank, Eagle rods, SRP pistons, SD Performance 325 cfm CNC heads, Comp Street Roller cam 266/272 duration on a 110, right at .650 net lift, 4150 Northwind intake with a 2" tapered spacer/adapter and a 1050 Dominator. TH350 with a 10" PTC that flashes to 5000 and 3.73 gears, 275/60R15 ET Street Radials. It was a good running combo and I hated to loose the shortblock but that happens sometimes using a 50+ year old cast crank.

Moving forward I decided to go with an All Pontiac aluminum block, 4.350" Mahle pistons and rings, Molnar 6.8 rods and a Molnar 4.375" crank. It comes out to 520 ci and it has the same 11:1 compression as the 463. I used the same heads, cam, intake and carb. I got it together just in time to take it to Norwalk this year for it's first passes. Interesting that the bore/stroke ratio is the same for both engines. The aluminum block is supposed to be about 60 lbs lighter than an OE block but I added weight back to the car with motor plates, heavy trans bellhousing and remote oil filter system. The car should be within 10-20 lbs of what it was before.

I really didn't know what to expect on the track. I knew it was possible that it wouldn't pick up much if it did at all if the cam/heads were already maxed out on the 463. Anyway, the 2 time slips here show the fastest passes from last year and this year. This is with no carb tuning and conservative timing on the 520. Needless to say, I'm very happy with the results!

Outstanding results! How is the idle quality with that cam? Sounds like a great combination

[firechickenman]

Originally Posted by R 70 Judge

Outstanding results! How is the idle quality with that cam? Sounds like a great combination

Thanks! I think it idles pretty good. Seems a little tamer than it did in the 463 but still pulls hard to 6500. Here's a video of it idling in gear at 1000 RPM: https://youtu.be/N4sn0RmPWKg?si=G5zARhziBhMY6B7x

[scott70]

It’s funny the things in life that make us happy. I would of been peeing my pants with joy over that improvement!

[CraigG.]

Congratulations!

What is the weight loss with the new block?

[firechickenman]

Originally Posted by scott70

It’s funny the things in life that make us happy. I would of been peeing my pants with joy over that improvement!

I was very pleased with the improvement and consistency not to mention no issues considering it was a new build. Luckily, there was no loss of bladder control!

Originally Posted by CraigG.

Congratulations!

What is the weight loss with the new block?

Thanks!

I haven't scaled the car since the changes, but I imagine it is within 20 lbs of the 3300 it was before since I added motor plates and a remote oil filter. The IAIIA block is supposed to be 138 lbs, OE blocks 195-205 lbs and IAII iron 245 lbs. My block weighed in at 127 lbs after machine work, drilling the deck and opening the oil drains in the valley. That is with the main caps installed.