400 stroker

[68chargerboy]

another motor for my 66 monaco, goal mid 10's to low mid 11's but i want to be able to drive it 15-20miles to the track and cruise nights. dont need power brakes, dont mind adjusting valve lash, dont need a choke. car will be raced every weekend (track nearby is 1/8 mile but i want it set up for a 1/4) pump gas is also desired

and the catch is like most people i dont want to spend a life savings on this haha theres always a catch

Car specs:
-built up 727 internally, stock valve body with shift kit, no convertor yet
-8.75 rear end with 4.10 and a locker
-4 link
-29" tall tires
-caged
-working on putting in a full interior
-all hvac components removed
-aeromotive fuel pump with -10 lines from cell to carb

here is what i am starting with for the build

400 block, i was going to build a 451 but i am getting a custom 4.125 stroke crank to put me near 500ci so i may use that instead if i need to make my goals, also have a 440 forged crank i can get turned down if the 451 is better for my goals

-what is next in line with your approval/help
-bore to 4.375 (of course all other necessary machine work)
-440 source aluminum main caps/arp studs
-H-beam 6.760 rods with 990 pin or stock ly rods if able
-pistons i found some on summit that would work with this combo, with a 040 comp h/gasket and 75cc heads would put me at 11.3:1 84 would be about 10.4:1
-head choice is still in the air, victors, eddy rpms, stealths etc
-rocker choice, ive heard ok things about the 440 source rockers lately
-based off what heads ill need to find a good intake, cam, and carb
-will also need to get a suggestion for a convertor to match the whole package
-headers all i can find is 1 7/8 primaries from tti, already have them on my car now but if need be ill try and get a set of 2'' that fit or i can weld up a set of my own

any other shared wisdom will be much appreciated

thanks

Zach

[c00nhunterjoe]

The heads on a 500 inch motor will be the key. Eddys or stealths will choke it without a lot of work. I would sink the money into a better head.

Steer clear of 440source rockers.  Harland sharps are not that much more and while they may be overkill on a mopar, its worth the peice of mind, plus with a 500, you will need a lot of cam, which means more stress on the rockers anyway.

1 7\8 will work, 2 inch would make more power up top, really depends on which heads you end up with.

[Chryco Psycho]

I would bore the block to the minimum you can get away with rather than go right to .055 or .060 over .
If you are using pump gas & alum heads I would aim for 10.7 or so compression ratio & use Cometic head gaskets , they will allow for the different expansion rates between iron & alum without tearing the gaskets & are available in different thicknesses to get the ideal compression ratio . By leaving the piston slightly below deck or using an 80 cc head you should be close to the 10.8 compression .
PRW is another choice for rocker arms .
You will need to determine where you want the powerband of this engine , cam , intake , converter & heads all need to work together in the same RPM range . Nothing worse than having a converter that stalls 2000 rpm before the cam makes power , the car will simply not move off the line !! You need the cam to be in the powerband at least 500 rpm before the converter locks .
I would also look for a carb around 2x the ci so 950 or 1050 CFM , Proform makes a very tunable carb for a decent price

[68chargerboy]

thats kind of what im asking, i feel that the heads and cam need to be picked together, or possibly heads first and then cam after.  so what heads do you guys feel are the best? too many options and i dont have enough experience with them all to know what will fit my goal.

Zach

[Chryco Psycho]

start with the RPM range that you want it to work at , no pint using cam intake & head that make power between 3500 - 7500 rpm & then cruising down the highway at 2800 rpm !!

[68chargerboy]

probably dont want to spin it up past 6600-6800

[Challenger340]

some pretty good Calculators over here http://www.moparts.org/Tech/tech/index.html

Just suggesting....maybe come up with a best guess on what the Car will weigh WITH driver, and some other "knowns" like preffered Gearing, Tire, etc., etc.
then,
I think it will be pretty easy to tell you "how", and what "parts", to make the power & trq you require.

[heyoldguy]

So the 66 Monaco comes frome the factory at about 3850 lbs, throw in a driver and your at 4000. Figure a good 730 HP at the flywheel to get safely into the middle of the desired et range. Buy a good cylinder head if your starting in that horsepower range.

[Cooter]

"another motor for my 66 monaco, goal mid 10's to low mid 11's but i want to be able to drive it 15-20miles to the track and cruise nights.  car will be raced every weekend (track nearby is 1/8 mile but i want it set up for a 1/4) pump gas is also desired

and the catch is like most people i dont want to spend a life savings on this haha theres always a catch"

Wow, 730 Flywheel HP normally aspirated. Um yeah, good luck with that...

[heyoldguy]

730 HP at the flywheel, normally aspirated, on pump gas, is not that big of a deal.

[c00nhunterjoe]

730 HP at the flywheel, normally aspirated, on pump gas, is not that big of a deal.

Indeed, 11:1 with big flowing aluminum heads behind his 500 inch bottom end can easily attain the desired results. Airflow is the key. Don't expect to bolt eddys out of the box and make that hp though.

[Challenger340]

730 hp on pump gas(real 92 Octane).....500 inch

Anything, "CAN" be done, the question will be as always in this world, because things happen, for time versus money.....
whether or not....
1.) the Budget is there ?
2.) satisfactory reliability/maintenance schedule can be attained for the application/customer is OK with it ?

IMO,
build the best Engine you can with the funds/parts available, match the tire/gearing/convertor in the rest of the car well, let it run and have fun......
that said....
low 11's is far easier/cheaper and reliable on the 600-650hp mark using real 92 Octane that can be driven on the street, get stuck in traffic with no overheating worries, doesn't bust Valve Springs, and generally saves the bankbook later.
Guys run them for literally YEARS, and hundreds of laps PLUS street driving with NO ISSUES.

Just my opinion here....
but you start getting into High Spring Rate Mechanical Rollers ......to satisfy those BIG thirsty Heads required..... to get around the lower C.R.'s for real 92 Octane.....then winging it to MAX to get the better efficiencies......then street driving too boot...
thats just plain HIGH MAINTENACE get out your wallet

[68chargerboy]

ok so one question i had is now over, decided to go with cnc'd victors for my head choice
still debating running 11:1 on 93octane or running E85 and higher comp.  my fuel system is already E85 compatible, however i have yet to buy a carb.  but either way i go i would have to buy a new one anyway so im starting to lean towards a corn burner, i know running 12.5+ comp will be able to help me reach my goals.  ordered aluminum main caps and a girdle, waiting on those to before i send the block to the machine shop.  think i may do a half fill of hard block too as ive heard many ppl say they have no cooling issues on the street.
as for the weight with me in it my car was just under 3750 with me in it, i made fiberglass bumpers for it and some other little things here and there 

i appreciate the helpful input that you guys are giving me. ill keep u updated as i go and please keep helping me on direction thanks

[68chargerboy]

is this an ok cam for my goals?

http://www.summitracing.com/parts/LUN-43718/

thanks

[Chryco Psycho]

I would look more at a custom grind using the Mopar friendly TF 904 series lobes ,Call Lunati tech & discuss the best fit with them

[68chargerboy]

thanks for the info!

[Challenger340]

I would look more at a custom grind using the Mopar friendly TF 904 series lobes ,Call Lunati tech & discuss the best fit with them

IMO
Best "fit", will be determined from some known Cylinder Head Flow Data on the actual Heads being used, NOT published data, usually SF600 with Flowcom, otherwise IMO,
waste of time...yours and theirs, and the .617 will probably be within 5-10 hp of ANYTHING they will reccomend without the data.