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I would say the damper slipped. Have a good look at your first pic. Plus u have serpentine set up which will magnify the vibration. Kim

My car ran 129.65 mph in the quarter. 3300 lbs. I believe it’s 550 hp or their abouts. Kim

Plus having 7.0-1 compression doesn’t help either. Your cam probably isn’t doing u any favours. Kim

Yes, it’s a lot easier nowadays. Kim

Yup, I started at 150, then 175/200/225 than the top at 250. The old low compression 440 made 100 runs with the 250 shot. Used it as soon as I shifted to second gear. Kim

The owner of a speed shop asked me what I was gonna do with that little cam. I said kill some chevies and fords. Kim

Ingenious idea I say. Kim

My 440 was factory with a bit of a cam. It took the 250 shot like a champ. I didn’t use it till second gear. Kim

I ran a 250 cheater on a 74 440. Started at 100 then kept upping it till getting to the 250 shot. Made lots of passes with it at 250. I had a separate fuel pump for nos. Kim

So ur gonna add that to the same cover as the 1st one? Kim

Good luck to ya Kent. Kim

It was gutted. Only a 6 point bar inside with a race seat. A very smart man built the engine. First refresh was for season number 7. 4.56 gears. Kim

My old duster was 2700 lbs without driver. 1.34 sixty foot. 11.001 quarter mile. Had more duration, I believe 346 and 356. Kim

That is a super stock cheater cam. Not very street friendly. EFI will not like it. Sweet car for sure. Kim

Just for comparison my 470 stroker Dynoe’d at 655 hp. Heads flow 320 cfm. I believe the formula is 2.06 hp per cfm. Mine is actually pretty dam close. Volumetric efficiency was 108%. I will add that some motors put out beyond expectations while others fall short. I can’t stress cylinder prep...

These are my pistons. Will be 11-1 with a 75cc head and a .040 gasket. This big engine needs a dished piston to keep compression down to livable levels. A bigger cc head will help also as well as a thicker head gasket. Kim

Sorry that I decided not to sell my 543 and am now building it. U need a Max wedge ported heads and a matching intake and a dominator carb to feed a beast like that. Regular port heads and intake will be choking it off. It will still make good power but not great power. Best heads out there is...

That’s a pretty sad 408. Kim

He was on last night. He must still be confused. Kim

I’ve used them a few times. I like them. Kim

I built stuff from not as good of parts as I would of liked. A guy knows what will live and what won’t. I would do it again and again. I seen years ago what I thought should of never ran and it actually ran very good. Kim

It wasnt a dig. I was just saying it just goes to show that someone in the know can build a better engine than 9”% of us. Kim

Kim La Roy’s engine wasn’t just some worn stock build. It was machined to exacting tolerances. Sure it was low compression but it had near perfect bores and a few tricks we don’t know about. He is also a Pro engine builder that is a whole lot smarter than most of us on here. Kim

Do u know what cam he used. Thanks. Kim

Ur not gonna build a quick 67 charger with that little engine and that big cam. Ur going about it the wrong way. Kim

Well u know u just can’t help some ppl. They ask for ur help but they don’t really want it cause they already have their mind made up. This is 1 of them. Kim

Easiest and cheapest fix is a good used 360 with a 4 barrel. Kim

He was on Wednesday afternoon. Didnt have the decency to update the thread. Kim

Ya, just maybe. Kim

The original poster was on yesterday and how many times b4that. He doesn’t have the courtesy to update this thread tells me that he doesn’t care about our opinions/advice. Looks like we just can’t help some ppl. Kim