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Hey Dan

Your goals are easily achievable

-470 rotating assembly with 10:1 compression
-MP 452 aluminum heads or RPM's (The 452's will work with your existing headers which are fine at that power level)
-Comp XS282S solid flat tappet cam (nitrided)
-EDM oiling lifters
-Crane or Isky Ductile iron rockers/Chromemoly pushrods

*the rest looks fine

This combo should make 525hp/550tq all day long with a big fat torque curve, run on pump gas and have a nice lopey idle


Ron


Ps. Here is a dyno sheet on one I helped with : 448ci RB build with RPM heads (unported) using the XS282S Comp solid. Runs fine on pump gas, idles at 850rpm with a nice rumpity idle and will boil the tires at will !



Your the third person I have read that have used this cam - the other two were for 451 builds. Theye swear by them. Its in my possible category list! Thanks for posting the numbers!

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Also... being its a street car and a stick, build
torque forget about the HP... build all the torque
you can.. a bigger ci engine normally makes torque
at a lower rpm so you dont have to spin it hard and
if you have the torque you have plenty of gear for
the street... the stick helps also since you can take
off at any rpm you wish




I'm addicted to torque the more the better!

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The limiting factor on making power is usually the traction, if it spins the tires your going no where fast That being said with a decent to good set of tires I would put the biggest C,I, motor I could afford, it is a lot easier to drive a car with your right foot to control the pwer that it is to stick your arm out the window to help make power by pedaling your arm in the wind when you don't make enough power If it was me I would build a 511 or 512 out of the 400 block, I have several of those size motors and they flat rock Another option is a 505 C.I. 435 bore with a 4.250 stroke with BB Chevy rod journals, I like and use long rods, 6.8 and 6.7 long No matter what C.I. you decide to build make sure and use the BB Chevy rod journal sizes, 2.200 and a long rod The Edelbrock heads flow more air out of the box so comapre costs and decide. On the cam and headers I wouuld go big on the headers and exhaust, 2.0 inch primarys, 3.5 inch collectors and three inch exhaust to three inch in and out muffs I like the Magnaflow 14x7 x3 inch ovals, basically straight through and fairly quiet at idle and part thtrottle driving, not so at WOT On the cam I would, and have use the Comp Cams XL-HL cams, either the XE-285-HL or the bigger XE-295-HL, installed them 4 degrees advance or a liitle more On the rockers a lot of the ductile iron rockers won't be the advertised ratio, usually less when checked at the retainers I would, if you can afford it, buy the good Harland Sharp full roller aluminum rocker arms, not the cheaper extruded aluminum non roller shaft ones they now offer Make the compression ratio between 10.0 to 1 and 10.75 to 1 depending on the elevation you run the car in, in higher elevation run more compression Good luck



according to google the elevation here in lethbridge is 3048 ft. or 900m

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If it was me, for the same money and the same amount of work I would build a 512. 4.25 stroke, 6.53 rods and 1.32 compression height pistons in a 400 block. All of this is off the shelf parts and makes for a sweet engine.

Joe

Can I ask you what you mean by “daily driver”? Are you going to drive this in bad weather or is it just going to hit the streets on nice weekends?
If it’s a weekend driver then, no it’s not overkill, you will have way too much fun. Plus, when/if you decide to go faster just change the top end, because the short block is already good to go.

Like I said earlier, it’s the exact same money to build a 512 if you are starting from scratch. In fact it’s even the SAME pistons used in both of the kits you mention.

Joe

PS I think everyone should own a 500+ CI engine at least once in their life.



When I say daily driver I mean from spring-fall weather permitting. Going to work and having fun on weekends. Some years our seasons are cut short. I want to drive this runner as much as possible. Why buy a new car and get todays garbage when you can drive an old mopar that brings on a grin from ear to ear?!

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You need to watch out for air cleaner clearance wit hyour air grabber setup using anything other than a stock intake with a stock unmodified air cleaner assembly , you WILL have to modify it using the RPM intake.

Build a 470 , use 1 7/8 headers if possible



i know i will have to mod the air cleaner about an 1" I was wondering if you are using the rpm heads, does it raise the deck height even more? I'm already gonna have to modify the airgrabber about a 1" and thats pushing the limit, I don't know if I'll be able to modify it if its more than that,

I'm gonna stick with the headers and exhaust for now, they are brand new in the box - bought them when I was gonna build a mild engine, and if i don't like the power i can always go to a bigger exhaust down the road.