Only 460hp

-
What sticks out to me is using that cast crank! I broke my cast crank in my 410 with about 355 rwhp!
I have only used a chassis dyno on my 1974 aussie Valiant charger but current specs are roller hyd cam with 236/242 @ 50 with 610 lift on a 112 lobe sep , 11.5 comp with trick flow heads used just out of the box, 5 speed tko box with 3.91 gears With old heads made 392rwhp and ran 11.4 qtrs @119mph. Now makes 425 rwhp So probably About 530 or 540 @ the flywheel and revs cleanly to 6500rpm. Idles at 800 rpm with only a slight lope and has 15 inches of vacuum when fully warmed up.
You do not need a bigger cam just more head flow! The trick flows are a great addition and work well just out of the box. I have not raced it with the new combination but expect it to now run low elevens but that cam is really smooth and does not jump around when coming down low especially with a manual transmission.
I am now 70 years young and do not like a pig to drive but hate autos and my car drives great but when you step on the gas at about 2 grand in second gear it just goes insane with wheelspin @ 6500rpm!
The low revving could also be the rocker arm instability, but the trick flows have also a raised rocker shaft location and Mike @ B3 also sells a relocation kit and it definitely helps in valve train stability.
By the way I noticed everybody was saying you need bigger headers?
In Australia we are limited on header choices because of our R/H drive and steering box location but I run a pacemaker header being a try y header 1 3/4 into 2 inch into 3inch with dual 3 inch exhaust system and works quite well.
 
I haven't responded to this thread in a while but just wanted to update everyone. I went ahead an got the Trick Flow 190 heads and intake. I also have a Victor 340. Got a great deal on scat rods with ARP 2000 bolts. Haven't chose a piston yet but leaning toward Mahle 16cc dished pistons, 11 something compression, and maybe upgrading to a forged crank. I'll let the professionals chose the cam but it's gonna be a roller. Goal is 540-560hp. I've seen the 1 5/8-1 3/4 header make the power I want.
 
I haven't responded to this thread in a while but just wanted to update everyone. I went ahead an got the Trick Flow 190 heads and intake. I also have a Victor 340. Got a great deal on scat rods with ARP 2000 bolts. Haven't chose a piston yet but leaning toward Mahle 16cc dished pistons, 11 something compression, and maybe upgrading to a forged crank. I'll let the professionals chose the cam but it's gonna be a roller. Goal is 540-560hp. I've seen the 1 5/8-1 3/4 header make the power I want.
I think you're right where ya want. I would absolutely suggest a forged crank. Not an Eagle, either. From my own experience, I don't think the Trick Flow's will support much more, unless someone does some work on them. Had 'em, ran 'em........sold 'em. I run a solid roller .640/.640 , 259/265 @ 50. Love it.

That's just my experience. Certainly not bashing anything.
 
I'm hoping some of you more experienced guys can give me some answers. Here's my combo:
414 stroker
850 Holley DP
Eddy AG port matched, center divider modified
Ported Mopar iron heads #P4876179 275@650 (advertised)
1.6 rockers
Comp 242/[email protected]
.558/.573 after lash
Valve timing
Open
@.50 Int:15 BTDC
Exh:51 BBDC
Valve timing
Close
@.050 INT :47 ABDC
EHX:19 ATDC




106 Intake Centerline
106 LSA
KB356.060 Step Dish pistons +23.5 volume (Yeah, I know.)
9.4 Comp.
1.465 comp. height
Eagle SIR rods
Mopar cast crank
Internally balanced
TTI 1 5/8-1 3/4 Step headers
MSD Ignition @34 degrees
Engine made 460@5300
511ft;lbs@3900
Volumetric Efficiency reached 100% at 3900 and stayed till 4900.
Peaked at 102.9@4600
My question is, why did it peak at only 5300 and not pull higher?
According to the info about the heads, the work was concentrated in the "bowl" area.
Flow was supposedly up 44% on the intake over standard 360 heads.
I never had then flowed.
I assumed I had enough cfm for more power but I know that's not the whole story.
I guess the intake ports weren't opened up
Do I need more port volume/ cross sectional area.
I assume the port volume if standard 170-176cc.
Heads were purchased years before the engine was assembled.
My plan is to replace the pistons with flat tops.
Replace the rods with Scat 4340 I beams, ARP2000 bolt material.
Replace the heads?
Any thoughts on the cam?
Those Trick Flows looking good but not if I don't really "need" them.
How do I get 500+ hp?
For the record, I did not build the engine.
This is a street car with 3.55 gears, manual transmission. Not after maximum high rpm power.
Any input will be appreciated.
Cc n flow the heads, with and w/o intake
Stock cc is around 160cc fwiw, you want.
I used the same pistons, don't detonate them or they'll shatter.
 
To get to 10 to 1 or so with those Pistons you'll need to Mill the quench pad down so it doesn't hit the cylinder head.

.040 or so off the pads, .040 off the heads, in total
 
-
Back
Top