360 Build advice

[goldduster318]

Most 360's have the center dump style truck manifolds that won't line up with your current exhaust, so you'd have to cork it a bit with the 318 manifolds. I doubt the 360 manifold would work on the driver's side anyway.

 

[67Baccaruda]

Inert Gas lowers the combustion temp (EGR Exhaust Gas recirculation was used to reduce thermal NOx) Thermal NOx is a result of combustion temps above 2500 deg F. Lower combustion temp = less detonation

 

[wigsplitter74]

Magnum heads can be had cheap, I got 3 sets all for free with whole motors, guess how many of them were cracked. . . All of them, I wouldnt put money into stock cast magnums, they're known to crack so just take the money you'd spend the first and second time around and look into Hughes Engines Iron Ram heads made by Engine Quest.

 

[74desertduster]

What summit cam did you use? Thanks! Brian

i have a 71 360 in my duster it is a truck motor and has factory flat top pistons. i put alow buck summit cam in and did a port clean up and gasket match with the summit port and polish kit. i am happy with the power i have, it would be nice to have more but a budget is a budget.and the guys are right about the rear end i had 307 gears originally and now i have 321's and could not believe the difference.

 

[rumblefish360]

Inert Gas lowers the combustion temp (EGR Exhaust Gas recirculation was used to reduce thermal NOx) Thermal NOx is a result of combustion temps above 2500 deg F. Lower combustion temp = less detonation

You don't know how many times I have ran that line on how alittle EGR doesn't really hurt an engine but help it in some areas only to be berated by the "Smarter" people of the world on how it destroys power.

I wish I could remember where I seen the article on this to further answer green1's question.

 

[74desertduster]

So I am picking up a fully machined with new pistons, bearings and cam but disassembled 1989 360 tomorrow. Got a really good deal, so low that I could not pass it up and so now I am back in business on building a 360 for my Duster...I started this thread months ago and then it looked like I was going to only freshen my 318. Then this deal came up.

It it bored .030 over and I think has stock pistons and cam but since it is apart, I can change cam and pistons if I want.

I know I want a cam and kb107 pistons would be good based on pass help here.

No heads so not sure on that. Don't want to go roller rockers/cam....how about 302's? I assume my 318 heads would not be a good match.

 

[rumblefish360]

Only for wacky torque to about 3000 rpm.

Look for a 360 head.

 

[74desertduster]

Pretty much any 360 non roller head?

 

[74desertduster]

After reading the site today and reading previous advice in this thread...how would this be.....

kb 107 Pistons
Comp Cams XE262H or XE256H....thoughts?
Stock 4 bbl intake
Stock 360 heads
Dual exhaust (in place), switch to headers when I can
Switch to 3.55 gears

Thanks to all!

Brian

 

[crackedback]

If it's an 89 360, why on earth would you want to put a flat hydraulic cam in it.

That block should be a roller block!

If it's a roller block, put the roller lifter/cam stuff back in it. Factory lifters are about $100-120/set. The cam might cost a bit more but you don't have to worry about flat lobes either.

 

[Robbie2734]

I have a 360 roller at the machine shop now. Like you I have been trying to keep the cost down. It took me a year to gather all the parts, so each month I set aside 200.00 a month and came out with a similar setup.
KB 107's +.030
eagle rods set up for floating
CL77 rod and mains
new roller lifters, Eaton, off ebay for 85.00
308 heads
new head bolts
cloyes double roller timing chain
Melling HV pump, have to get yet
360 exhaust manifolds, a body..on my 318 now
The rods and pistons ran a tad over 400, the machine shop will be the expensive part. You'll have to get the rotating assembly balanced, the pistons are lighter. Good luck with your build.

 

[green1]

You don't know how many times I have ran that line on how alittle EGR doesn't really hurt an engine but help it in some areas only to be berated by the "Smarter" people of the world on how it destroys power.

I wish I could remember where I seen the article on this to further answer green1's question.

so do I; this is really interesting; how inert gas helps. I always thought it was fuel and oxygen. With nitrous oxide, releasing more oxygen. More HP. No inert.

I really want to know more.

 

[74desertduster]

I don't have any roller components or heads so thought cost would be much greater....

 

[moper]

My understanding of it (in a previous life I held my ASE Master Tech merit badge) is the EGR came about because they started worrying about NOx, or oxides of nitrogen that are a by product of poor combustion. AS the chember temp rises as was noted, the NOx goes up. The first catalytic convertors did not address NOx, so the factory found by routing cooler exh gasses into the mix the chamber temps went down. It also allowed more total timing which aslo reduces NOx. It wasn't to replace "air" (which is mostly inert gas anyway... as is the nitrogen component of NO2). It was to cool the chamber to cut down on NOx emmisions. The amount of exhaust gas is critical. If you ever had to replace one on a GM you got a valve with a hundred washers with different holes in them to meter the gasses. You had to match the size to make it fuction properly. Plus, over time, the diaphram would wear and become a vacuum leak. I believe the modern cars that still use them have them computer controlled to precisely meter the gasses being diverted. It does allow more timing. But because it appeared at the same time the HP figures changed from gross to net, it was considered bad for performance. IMO, it's on e of those things that is just assumed and misunderstood. Like running no vacuum advance or running a double pumper Holley on a street car.