What are some simple yet effective hop ups for a new Hemi 6.4 crate. I just don't think 485 HP in a 69 RR will be enough. Cam swap? would like to get it to 500-550. Thanks

Well, the HP rating on that engine is with all accessories on it, including exhaust system,that is a NET Flywheel HP #, so comparing other dyno numbers that are a GROSS flywheel # can be quite different, what is the goal for the Road Runner , 1/4 mile ? some long tube headers is worth a little.

Mainly a street cruiser. But would like a mid to low 11. I thought about the Hellcat crate. But I already have a Passon 855. And that would be right at the limits of that trans.

mid 11 should be no problem if you can shift the trans & launch good,

Is this crate 6.4 an assembly line SRT8 6.4 or something else? An assembly line 6.4 with a tall mopar intake, dialed in appropriately sized carb and long tube headers can actually put out over 550 HP without ever removing the valve covers, I have heard as high as 580 with a wilson modified tall intake and the drag strip numbers seem to be able to back it up. Look what a good cold air intake, slightly bigger throttle body, true long tube headers and a good tune do to an otherwise stock 6.4 in a stock challenger or charger.

I've never seen a stock 392 on an engine dyno but I'd guess 520-530hp. The 485 rating comes somewhere between the flywheel and the rear wheels as I understand

Here is one on an engine dyno with a little work done

https://www.youtube.com/watch?v=PYsSsjEjS0g

That cam is smaller than stock and my eyeball calibrator says those pistons have a lower compression ratio than stock.

My 2016 scat pack with a 392 runs 11.70-11.80s with good DA. If the rest of the car is setup, that 392 should push a b body to mid 11’s no problem, due to the weight difference. The 392 is pretty stout from the factory, which makes getting more power out of not cheap.

Using this HP calculator based upon 1/4 mile MPH and total vehicle weight: http://www.moparts.org/Tech/tech/index.html ...

My '73 E body w/ BBM: 3755 #s 126.4 MPH = 591.8 HP (10.52 pass at 514 DA)

My 2021 Scat Pack 1320: 4300+ #s 113.x MPH = 484.2 HP (12.0x pass at 1700 DA)

This right here, minus 1000 LBS should easily run low 11s. Curb weight is supposably 4400# (Not even counting driver) and according to waller racing calculator an 11.70 takes 540+ HP. With serious traction (LX cars are not know for great traction), actual long tube headers and a tall intake without emissions, longevity and MPG oriented tuning should be so easy to get low 11s. They have been proven to make big gains from real headers, intake, and tuning. Look at some of the fast cars with only bolt on modifications and put the numbers in a calculator, it's enlightening for sure. I am convinced 550 without pulling valve covers is not hard at all and some I have seen it seems as high as 580 is possible, I got an email a combo with a wilson modified tall intake, high quality long tube headers and I think it was a 950HP style carb making 580 on an engine dyno but asked to remain un named so it could be load of crap but it does seem very plausible.

The ports have crazy amounts of flow, the stock cam would have been considered big for a street car 20 years ago add in the very well designed oil control, light weight valve train, very low friction ring pack and you can see how the HP potential is there.

Can you imagine how much grief you would get on this board if you built a 392 CID stroker 340 with ported W2 heads, 5/16 valve stems, latest high tech rings, windage tray, crank scraper, 230@.050 .575 cam, 10.9 compression and only made 485 HP? Your silly if you think there is not a lot more there.