chris83

im just wondering what the estimated hp and tq could be of a engine im having built.its a 70 455 f block punched 40 over magna fluxed and cleaned and clearenced.the big valve c heads that have been decked and clearenced to the block plus port and polished with 3 angle valve job.trw forged pistons.forged crank,all new clevite bearings.comp cam extreme energy 284 cam shaft kit.the new aluminum full roller rockers from comp cams.torker 2 intake with 750 holley possible switching to my 1000 cfm demon.headmen headers to 2.5inch exhaust h pipes and flow master 40s.built turbo 400 trans with stage 3 trans go shift kit.4000 konan stall.built 10 bolt with eaton posi unit,strange axles,c clip eliminaters,and 4.10 gearing.im running bf goodrich 295 50r 15 tires on centerlines.body is a 74 cutlass.

chris83

manic racingin beloit wisconsin built the motor and we where shooting for 500 to 550 hp motor is blueprinted and balanced and around 11.5 comp.

Run to Rund

425 maybe 450 is my guess

chris83

got to be more than that or what do i need to get the hp up around 500 hp.

cutlassefi

I'd say 460-475 if it's a good port job.

chris83

thats more like it lol.thinking about either getting rocket racing heads oe edlebrocks.

cutlassefi

Horsepower TV did a build 2 years ago with Edelbrocks, that same cam, a Performer and an 870 Street Avenger. It made 456 in "cold air".

You'll need more cam to make 500 or better. But I'd definitely go with the Edelbrocks.

Jmo.

chris83

ok thanks cutlassefi

442rocketdave

If you want a good cam try some of the racing cams not the street or voodoo cams but their racing cams from Lunati, they have always worked well for me, try at least a .565 lift and 250 or higher duration and try to keep lobe center at 108. You should be able to pull more power out of it and be critical on your clearances. The heads are where the HP is at!

ah64pilot

I'm jumping in kinda late here but Chris, do you by chance know what the deck height is and the head CC's? With those TRW pistons I'd say you're going to have to have a really small chamber head and zero or negative deck height to get 11.5:1 compression.

Someone feel free to correct me but I think the 4000 stall might be a little too high for that cam...especially if you're not revving over 5000 - 5500 rpm. The 4.10 gear might be a bit much for 1/4 mile as well...anyone else wanna chime in?

442rocketdave

Ah64pilot is right on the compression issue and on the torque converter, I made that mistake back in the 70s too much stall and not enough cam and rpms. 2800 stall would work well with that cam and the rpms your going run and the 4.10 gear will be ok if you use a tall tire... 30 or taller. you have to do the math, rpm,gear, tire dia. but with a 2800 stall it will be easily driven and still stand up and go!

442rocketdave

I had to get my cc,s to 77, use a .020 head gasket, metal, and the deck set at .002 to get 11.1 compression. Its tough to get that compression with those pistons. On the torque converter you could use it if you change your cam and use that Demon carb. Then use a 28 dia tire. should come out hard.

Doug Blake

Chris, i'm with 442rocketdave that is way too much stall. 2800rpm would be much better! You'll enjoy the 4.10 gears around town, but not as much on the hwy. i have 4.10's i my 77 442, and 73 442.

as for engine hp i'd also say 420hp? my 455 .060" w/10.25:1, ported 75cc B heads, jm 28-29 cam, torker, 850, dyno'd 457hp @ 5100, 523tq @ 4000

z11375ss

I have 3.73s in mine and it is too much for the highway for sure! I have a TKO 5 speed on the way! Now I can put a sticky tire on it and not worry about breaking the trans (M20, out, TKO, in). Here's a boring vid for you I made when my car was dynoed. The power numbers are to the tire.

z11375ss

Doug, are your numbers to the tire or flywheel?

RetroRanger

That is boring video, but those numbers are pretty exciting!!

Thanks for sharing

Doug Blake

z11375ss those are corrected #'s on engine dyno.

z11375ss

So flywheel HP, then? Gotcha. I used to own that Speed Shop. You talk about fun! Expensive fun!