Building a budget stroker for my 65 Satellite street car 440 block,Eagle 4.15 crank h beam rods and forged pistons final compression will be 10.5.
Mopar Performance stage 6 heads and M1 4500 intake would like to have them ported so they flow 300+ cfm @ .600 lift Hughes fast rate hyd roller undecided what one.
Any suggestions would be great the car in full street trim,full interior all steel,with an automatic and 8 3/4 and 4.10 gears

Dean,

At altitude, your net mechanical compression will be about 8.0 to 1, not 10.5 to 1. Your cranking compression will likely be in the high 6's with that cam. It'll be a decent street car with the cubes, and it'll run on cheap pump gas but you'll be leaving a good bit on the table.

As you probally already know stroker motors eat up cam duration So don't be shy on pcking a big one Keep in mind the converter and camshaft need to work together to make the most, best use of both I'm thinking between 250 and 260 duration at .050 on both lobes, ground on a 106 to 109 lobe seperation angle and installed 4 to 6 degrees advanced on the intake lobe with as much lift as you can get, maybe even use 1.6 or 1.7 rocker arm ratios if you can The pushrod clearances to the block and heads can be a problem on the higher rate rocker ratios on BB Mopars Measure twice, grind less

The most important thing you can do is to optimize the compression ratio for your fuel, and pick the right cam for it. I have no idea how high you can go out there, but would assume it will be somewhat more than 10.5/1. The actual power difference between a 10/1 motor and a 11/1 motor is a fair amount higher than you think because it is based on the dynamic compression ratio at low to mid rpms. If you don't have pistons yet, make sure you get this figured out before committing. You may be able to mill the heads a fair amount to help out if you already have the pistons. My 440-1 heads are cut down from 75 all the way to 62cc to get race compression with very little dome. You want to keep the piston to head clearance to a minimum, but not tighter than .040, no more than .045. This will also allow a bit more compression on the same fuel. When figuring all this out, small things like the bore of the head gasket being too big can hurt you a touch. Go the extra distance, build it right and reap the benefits for the whole life of the engine.

Never considered that my altitude would have an effect on compression ratio,thanks for that info.Also did not know that a stroker motor needs more cam,both are things I need to think about.With the aluminum heads I can run more compression anyway and I can buy Sunoco 110 at the pump here would 12.5 be within reason then?Any thoughts on what size 4500 style Holley I should be looking at?

Some days it has a BIG effect. I've seen density/altitude in the 10,000 ft. range during the summer.

The last engine I built for Denver had 12.4 to 1 mech. compression and good quench. It was a 383/451 stroker with a cam in the 260º / 266º range. For fuel I used a 4 to 1 ratio of 101 race to 91 pump. just to be safe. I was shooting for 180 psi theoretical cranking compression. I got my mechanical compression near that and juggled duration slightly. Getting your cylinder pressure up and carefully choosing parts is the name of the game out there.

Give Greely Auto Machine a call and see what they tell you. You'd be surprised how many people that have built engines out there don't know to ad 1 point for every 2500 ft. of elevation. When the engine works out to be a dog, they just blame it all on the altitude.

Bruce is my go to guy for machine work @ Greeley Auto & Machine

If it were me, I would run 11.5 to 1 up there. I would also recommend a street solid roller. Hydraulic rollers aren't very aggressive ramps and don't offer any performance advantage in a mopar in my personal opinion.

Do you own the Stage 6 heads? There have been a lot of quality control issues with those.

Sheldon

My build is close to about what your doing but mine is built for close to sea level. I can tell you about it just to let you know.

I use a 440 block with the 4.15 crank and at .030 over its 493 cubes. I used the 440Source kit as I have the D-dished pistons to get 10.6 comp using the basic Indy EZ heads I use and I built a nice .046 quench in it as I run 37 total timing and no ping at all on 92 pump. I bought the EZ heads from Dwayne Porter who also did a small amount of port cleanup. I also had Dwayne spec me a cam as I use a solid flat tappet thats 264 & 270 @ .050 with .585 & .592 lift. I use Hughes 1.6 rockers for about .630 lift and its has a 110 LSA as it in the eng on a 106 centerline. I used the basic EZ heads so I can use standard rockers as they dont need offset rockers and the exh port is in stock location. Dwayne Porter is very good as I would consider him one of if not the best head and cam guy out there so you might consider calling him and speaking with him. Up top I use the Indy dual plane intake with a Holley 850 DP. TTI 2" headers and the TTI 3" exh out to the rear bumper. I run a 727 with a 9.5 Dynamic converter and a manual V/B with 4.30 gears and 30 x 9 tires. My 63 weighs just over 3700 lbs with me in it and its run 10.70's so far on 92 pump through the full exh. I really think it has a fair more in it if I ever really get after it. Ron

my heads are good my buddy ran them for 2 years before I got them from him,so no worries there

Excellent.

Sheldon