thanks for all the help.

so as far as my d3's go right now im going to have the pedestals machined so i can go studs and roller rockers then going to do a port job myself. but will increasing the valve size be worth the extra money? if so is it better to increase both or just exhaust?

as mentioned before, sometime in the future i have a daily driver 78 4x4 with 38" tires that needs a fresh motor. nothing fancy just bore it .030 over and raise the cr so it will be a little more exciting to drive. will that see large benefits if i spend the money now on the d3's for larger valves to use on that engine?

sorry for the endless questions

 

do the d3's really improve a lot with larger valves? is it worth the extra cash or just spend it on the aluminum heads? i guess i am looking at it that right now that would really help this stroker breath and when i upgrade to the aluminum heads i could then use these d3's for another build in the future seems how i need to spend money on them now for machining of roller rockers anyways.

the future build would be a nothing fancy 466 (.030 over) used in a daily driver 78 4x4 with 38" tires that just needs some freshening up

sorry for the endless questions just want to have everything thought out before i start spending

 

sorry for the multiple posts. i didnt think the first one worked (even though it double posted) so i typed the second one. now if i could figure out how to delete them.

oh well back to looking for a cheap set of tfs streets

 

Since I always say it's a good idea to put hardened exhaust seats in even on later heads then I would do the exhaust. Intake is going to help on higher hp and bigger CID motors of coarse but your future goals you would be better served to just up the exhaust to 1.71 IMHO

 

thanks for all the help. thats why i love this site. most of the time i find answers just by searching. when i cant find what im looking for someone is always willing to help.

machine shop said they would break in the engine on the dyno for me, so just for the heck of it i will post up the numbers on what this 520ci will make on d3's with port work and the exhaust valve increased to 1.71

 

www.mpgheads.com had some aluminum heads for sale. CJ stuff but forgot which ones. You motor will make power but like monster said gonna take some tedious work. what are some of your engine rules/regulations. hyd cam or solid or hyd roller/or solid roller. mpgheads sells a template for porting heads in the paticular head your working if I remember. shows you which areas to concentrate on and not touch. MPGhead is a engine master competitor and been in business over 20+ yrs. Scott main knows his stuff and would be a good guy to get familiar with among many other quality engine builders in the country. Catch you later and good luck.

 

Do all of your port work before spending money on the machine work. If you fall through somewhere or screw up bad you will be throwing the head in the junk.

 

time to bring this post back from the dead. needless to say life happened. now its time to get back to my project.

what I have so far:
bore: 4.39
stroke: 4.3
rod length: 6.8
block height: 10.32
piston below deck: 0.015
pistons: -20.83
heads: 92cc
I had the shop open the exhaust valves to 1.72 and then I got to work porting. here are my flow numbers.
lift/int/exh
.1/78/63
.2/163/102
.3/219/136.5
.4/268/178
.5/298/185
.6/317/185

so needless to say the bottom end is buttoned up. I was real happy on how the heads came out. they were also machined for 3/8 studs so i can go roller rockers. now its time to make decision on what cam and intake I should run.

again going into 79 350 regular cab long box with c6, locker front and spool in rear with 44" boggers and 5.38 gears. Truck will be street and trail driven (mostly trail) I want a low stall converter so I can somewhat control the truck on rocks. I also want to be able to let the tires clean out in the mud so lots of torque is needed. I figure the truck will spend most of the time in the 3k rpm range but i dont want it to fall on its face when it gets over 5k

I am thinking of going with a stealth intake just because they are almost half the price of the eddy air gap but am confused. will the 8021 runners be to big and cause turbulence going into the d3ve heads? am i better off with the 8012?

also what kind of cam should i be looking for? roller?

sorry for the long post but I wanted to get all the info together ( I am sure i forgot something) thanks in advance

 

I figured someone would at least tell me how shotty of a job I did on the heads.

planning on a 5500 rev limit maybe 5800 tops. will the standard stealth (8012) be up to the task for this much air or better off with the 8021? looking to maintain lots of low torque

 

You have the botom end together, balanced & you haven't picked a cam ? Hope you have enough valve clearance. The guides more than likely will have to be cut down for retainer and seal clearance.
I'd just shelve it till you can afford some good heads. It's a pretty big motor now for those heads and as you now know need a lot more port work. If you are dead set on using the heads for now then get the big port manifold so when you get a good set of heads you won't have to buy a new intake. Just open the ports up to the gasket size. You don't have to go back in the ports very far to do it.
You don't say what axles you have but regardless, a locker in the front is always a bad idea, no matter what axle you have. I'd only ever recommend a Powr-Loc in a front, excelent manners, no broken parts & always turns both tires. If you have a 30 spline Dana 60 rear, save yourself time, money and aggravation and get something with 35 splines and either a Powr-Loc or a Detroit Locker.

 

With aluminum cylinder heads, kiss your low end torque good bye. And for a good pair you will be in it more than 1500 assembled. 500 hp will require 6,000 rpms most likely. By the time you get there your cam will not be producing that low end torque. And you will want bottom end work done to support those rpms. Aluminum cylinder heads do not equal best bang for your buck.

 

You need to give Scott at Reincarnation a call and get a custom ground cam, you won't be disappointed. Call an expert, you should be able to hit 500 with no issues.

D