360hp guesses

-
Nothing wrong with an engine at this level that can run on 87 octane junk gas. Although it would be fun in a light car, I think it would be great in a two wheel drive Ramcharger for a driver/cruiser.
 
With that low of a SCR, the best bet would be boost! Big single plane, blow throw carb and a moderate sized turbo would make this thing 500hp easy, IF the pistons can take the abuse.
 
vntned said:
With that low of a SCR, the best bet would be boost! Big single plane, blow throw carb and a moderate sized turbo would make this thing 500hp easy, IF the pistons can take the abuse.
Click to expand...
Throw in a set of TRW low compression forged slugs, gap the hell out of the rings, and put a 6-71 on it!
 
Brief (teaser) update.....

The motor was run in initially with a shop carb.....Holley 4778 700DP.

They put the Eddy 1407 on and it’s pretty rich(high 11’s)...... so they’re doing some tuning.
 
Drum roll please.........

Printer toner appears to need replaced......

Run is from 3000-5600.
TQ@3000 = 345.8
TQ@4600 = 367.8
HP@5200 = 331.5
HP@5600 = 317.9

1DD196F0-F955-4E32-B0BF-5FB6341AE74C.jpeg
 
I think it’s a good illustration of the importance of the “combination”, and that one or two good parts in the combo won’t always bring up the overall power level of the package.

In this case, I feel like the “big” heads(relative to the rest of it) combined with the low compression ended up with a lower mean velocity average than if smaller heads has been used, which cost some power at the lower end of the powerband....... and it can’t really overcome it in the upper rpms with the small intake manifold.

A point and a half of compression, some quench, and an RPM and I suspect the numbers would look a lot better.
 
Interesting stuff.
My own 360 has 11.3:1cr.
'302' closed chambered 318 heads.
Airgap intake
Comp XE256 cam
Dougs Headers

I have Speedmaster heads on the shelve, and a Comp XR268 coming my way in a few months.
I wonder what my mill will make of that when the time comes.
 
BigBlockMopar said:
Interesting stuff.
My own 360 has 11.3:1cr.
'302' closed chambered 318 heads.
Airgap intake
Comp XE256 cam
Dougs Headers

I have Speedmaster heads on the shelve, and a Comp XR268 coming my way in a few months.
I wonder what my mill will make of that when the time comes.
Click to expand...
I hope you have some seriously good gasoline to run that one on! With the 302 heads, it will run out of steam in the 5000 rpm range. It will make gobs of torque on the way there, though.
 
318willrun was closest with the hp guess at 335hp.

I nailed the torque guess at 368ftlbs.

What did we win?!?!?!?!
 
Curious as to what opening the performer runner outlets up to 360 size, milling the spacer in the plenum to .3 inch above the floor, adding a one inch spacer, and getting the A/F to 12.5-13:1 would do....
 
Last edited:
It was richer...... and made less power.
The area near the bottom where it tips into the 14’s...... it might make a little more power there if you could richen it up in that area without screwing up something else.
I had a 360 on the dyno a few months ago.....used within 5lbs/hr of fuel in that 5000-5500 range....... made 90 more hp with it.

For what would come down to a very minor difference in initial cost, some better planning would have likely yielded another 50-75hp, and probably 30-40ft/lbs.

Zero deck pistons for 9.5-10:1, an RPM A/G, and the next bigger cam(XE274)....... or better yet, a small solid.

I wonder what the aftermarket heads are really worth on something this mild........ compared to something like a bowl blended 1.88 valve stock head.

There was a brief discussion about reworking some stock 360 heads, but they didn’t have any cores, and $$$ wise, it really didn’t cost hardly any more to get the new aluminum heads.
I know that I was counting on the heads to have an impact on the power output when I guesstimated the results to be in the 400ft/lbs area.
Obviously I was optimistic with my expectations.
 
Last edited:
I imagine at an 8 something:1 compression ratio, iron heads probably would have been worth more power on thermal efficiency alone... Probably a good candidate for a set of 915 J heads. But no doubt some zero deck pistons would still be a lot better.
 
You must log in or register to reply here.
-

Back
Top