The engine is already built and no parts will be changed. Just looking for educated HP and Torque estimated for this particular setup.

448 ci.
Stock 452 heads (no porting)
Cast flat top pistons (no valve reliefs)
Hughes Whiplash SMC3245BL cam 5.18 lift 232 / 245 duration
Stock valves with Hughes hydraulic lifters and springs
Mopar Performance dual plain intaket
Stock 1964 Street Wedge exhaust manifolds
750 Carter AVS carb
Stock points distributor and ignition system
Calculated CR = 8.61:1

Trying for a cruiser with grunt that's happy on pump gas. Won't see a drag strip or light to light racing, just a cruiser.

Any educated estimates appreciated.

370-380HP at the crank, 320-ish at the rear wheels.

I had a very similar combo.

too much cam. 300hp.

On an engine dyno, those exhaust manifolds but no mufflers, properly tuned..... I'd say 440-450tq, 325-350hp. My prediction is the low head flow, low compression and lack of scavanging will result in the hp peak happening at a pretty low rpm.....probably 5000 or less.

Installed in a typical street cruiser with a 727, I'd say 275-290rwhp.

Is the calculated compressio ratio the dynamic or mechanical compression ratio?

Static is 8.61:1. Dynamuic is 8:1

Did you degree the cam and get the intake lobe center where Hughes wanted it or did you line the dots on the timing set and call it good? One of my new customer and a new freind now had a stock stroke 440 +.030 motor built by a local machine shop in the next town north of us, it had a Mopar Purple Shaft 284 grind in it. He assumed the shop degreed it and he assumed that the compression ratio was around 9.0 to 1, it wasn't He drove it for several years in a 1963 Plymouth Sport Fury and thought it was okay The cam was installed at 8 degrees retarded and it had a true mechanical compression ratio of 7.1 to 1 when we check it out The only reason we found that out about that motor was I built him a new 440 motor with a set of new Mopar replacement 1964 M.W 516 iron heads with a used OEM crossram from another local retired bracket racer for the original WOW factor at the car shows he goes to He was impressed on how much more power it has than the old one had He had a opportunity to sell the old motor, it has less than 3000 miles on it, he is thinking of replacing the cam due to the very low manifold vacume it had It's probally a good thing he decided to check the motor out, it had a set of 906 heads on it and he does have a set of 516 and 915 iron heads to help bump the compression up some without replacing the pistons or cutting the deck a bunch I had shown him how to verify and degree the cam timing and the true mechanical compression ratio when I was assmebling his new motor in my shop so he ask me to come down to his shop and help watch, guide and verify what he had learned and bring my tools for CCing the heads, dial indicator on a flexble magnitec stand and crankshaft degree wheel. It amazes me on how bad some parts can be put together wrong and still make poeple think it runs okay Good luck on your build

350-370hp and 450 torque. I think with a better cam and a set of headers you could be knocking on the 400hp mark. I have not seen any data on those whiplash cams to see what kind of power they actually make.

you guys need to put the kool-aid down.

400 B +.30" over 9.7:1
unported 906 heads
stock rockers
Eddie RPM intake
Comp "baby" thumper 227/241 and matching springs
426 hp-444 ft/lbs
Read About it here More details here
You are giving up some compression but have more cubes, so I'd guess similar # with a good tune maybe some more torque.
I bought the shortblock, had Brian massage some RPM heads I had, added some 1.6 rockers and topped it with an Offy tunnel ram. Made 472 hp-489 ft/lbs.

lack of compression will hurt the torque and hp. i'm in at 400 ftlb and 300 hp.

With that combo peak may have a decent no. but power band with that cam and the rest of the combo will be a turd. That cam would want more compression,converter headers and gear.Just my opinion.

The 400 in question; "We chose a thumpr hyd. cam, stock rockers, bowl cleanup in the ports ,stock valve sizes (manley valves)and comp single springs.
Topped with an rpm intake, 1" open spacer and a box stock 750holley it made 427HP @ 5700rpm and 443Tq @ 4200rpm using TTI 1 7/8 headers."

That motor really is a whole different animal than the OP's combo IMO.

For those who feel its too much cam... this particular cam was chosen expressly because it is designed for low compression engines.

Hughes says (if you can believe a cam manufacturer)...., "Our Whiplash cam is designed for low, basically stock compression engines. This cam will run on pump gas in a 440 with 9.25:1 or less compression and iron heads. If your compression is higher than this you may need to use a higher octane race fuel. Your vacuum should be in the 9"-11" range using this cam. This cam raises cylinder pressure and is ground on true .904" cam lobes. This gives you max area under the curve and has low lift to clear guides."



Now, I'll admit I have no experience with this cam but... When researching I found there were many more favorable comments than people who didn't care for it. I guess only time will tell.

I don't feel the 107lsa and ex manifolds are really the optimum pairing.
For ex manifolds, that cam wouldn't have even been on my radar.

If you were set on running a Hughes cam in that combo I think you would have gotten better results from a SEH2024-11.