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sounds good but its not a RB? (raised block) thats the one most use to buildIm biuilding a 383 Rb bored 0.060 and hoping to hit the 500hp mark. still working on the rest of the parts.
Maybe close. You're almost identical to my build, but I've got you by about 60 cubic inches (440, .030" over) and your cam is a bit heavier than mine. I'm running a 74 Charger, which should be the same weight as yours (same car really).
Not sure how the numbers balance out, but you might be pretty close.
What you didn't mention was the intended use for the car, and what type of transmission and rear end (gears) you have.
With those cam specs, it should sound great and have plenty of power, but might not be the most comfortable thing to drive on the street.
The powerband is quoted 2,400-6,600 RPM and the intake powerband is 2600-7200 RPM.
Exhaust will be 3" flowmaster 40 series but disconnected on track.
The car will be lightened a bit : Front fiberglass fenders, aluminium radiator, aluminium water pump, bucket seats, aluminium intake.
Don't worry about subframe connectors, it's already planned We're going to use 28 X 10.5 X 15 MT slicks on track
We want this car FAST street drivebility is the less important thing. My friend want to have Power, Sound, Fun and Make heads turn
Couple of things I would do somewhat differently but honestly its more my taste versus yours. I would say your combo will hit 440-450 if you get a wideband meter on it and tune spark and carb for max power.
If you NEED to hit the 500HP mark here are a couple places you can pit up some ponies. But honestly, your combo is gonna be a lot of fun as is.
Camshaft: Purple shaft is decent but there have been huge improvements in cams.
Consider a cam with at least 6 more degrees more on the exhaust side and look for something with a decent lobe like the XE HL for a flat tappet or XFI lobes if you make it a roller. A roller will significantly up the HP and those heads can support that lift.
Have your head guy give you at least .620 retainer to guide clearance. It gives you wiggle room for cam swaps with new lifts and shimming if needed. I would pick a beehive spring that fits your cam needs and have the pocket machined while they are there to get you the right installed height and pocket. You may pay a little in machining but it will open the door on springs if you need to swap out cams.
Dwayne porter built my 383 in vermont, here is what was done, 10-1 diamond pistons,comp solid cam (.520-.521 lift, 244-252 @.050 dur)1.6 roller rockers,edelbrock rpm intake holley 750 mech. sec. ported 346s that flow 280 @500 or 550 lift 1-7/8 tti headers. engine made 496hp @ 6600 rpms and 475 @ 4800 ft.lb. tq. your engine will make 500 hp if you change that cam, and go with a solid!!! 383s love the rpms!!
Well, it’s been a freaking while since I’ve been here. FINALLT that 383 roar to life on December 23rd 2017.
We had LOTS of issues on the dyno (starter issue, massive header leaks due to head stud interference with header flange, burned spark wire ...)
The engine seemed lazy under 3000 rpm, but managed to make 501hp @ 6400 and 454 lb.ft @ 4600 (I think) ...
Really happy with result but looking to improve a bit
We might try to swap to a performer rpm intake instead of the M1, and may try advancing the cam 4 degrees to increase torque and cylinder pressure !
What you think ? ! Oh btw 501hp
was with a 950cfm carb not the 850
Yeah, been a while. I really think that carb and manifold are killing you.
Last year I swapped out the Torker and 850 for a Performer RPM and 750.
The difference in response for normal driving was pretty significant and top end specs didn't change much.
The 3800 stall may be necessary to get to the power band quickly enough on the track, but will add you your driving discomfort.
Seriously, if you "need" a 950 with those cam specs, something ain't right.
You really have to think if you're building a race car or a street car. IOWs, how often are you getting to a track?
While i agree there are better manifolds than the M1 for the low deck, even the torquer II is worth a few more hp but the car will not hurt anything on the dyno but might be flat in the lower rpms on the street. I also agree with the 3800 converter, the TA 3800 would stall around 4300 with a 4.10 gear with this combination. Make sure you have a good transmission cooler and temp gauge for street driving.
04-09-2012, 10:26 AM
Im biuilding a 383 Rb bored 0.060 and hoping to hit the 500hp mark. still working on the rest of the parts.
