Is 426ci 360 a small block?
- Thread starter IQ52
- Start date
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Got the engine back on the dyno today. The crank scraper/windage tray trick was worth 8 peak horsepower. We now stand at 611 horsepower @ 6,300 rpm and it will carry 600 hp from 6,100 to 6,600 rpm where we shut it off. Three pulls made 610, 611, 611.
Man I wish we had better heads.
Wait! Was that an echo?
Man I wish we had better heads.
Wait! Was that an echo?
Try those E3 plugs?
dadodgekid
When in doubt... floor it
Are you gunna do what i think your gunna do?!?!?! BPE heads??
Did you fix the timing issue with the full advance also with these pulls?
After a series of pulls with the E3 plugs there was no gain in peak horsepower. There was an average gain of 2.5 lb-ft of torque and 2 hp in the 3,000-6,000 rpm range. I have not been checking the averages above 6,000 rpm.
The timing issue has not been resolved, we are still working on that.
There is no time to try other heads on this engine. It has to be in the car within the next two weeks and on its way to the grand opening of a new 1/8 mile drag strip here in Idaho. Then if I understand correctly, it's on its way to some slalom racing in South Dakota.
dadodgekid
When in doubt... floor it
Where did it pick up an extra 10hp?!
ValiantRacing
Well-Known Member
Nice pump gas motor
It was a combination of changing from 1.5 to 1.6 rockers and valve lash changes. This engine is just plain out of cylinder head. We gained about 6 horsepower peak from the rockers and the rest with valve lash. I can vary the torque some 20 lb-ft down low with valve lash but only gain a few horsepower up top.
dadodgekid
When in doubt... floor it
Outstanding!! Just curious.. do you think it would crest 650hp with a set of well built W-2's?
SSG_Karg
Enhanced member
I cannot say. I think I haven't had my hands on set of W-2 heads since about 1980 when Dad was building his NASCAR engines. The last I remember, his 357/340 was at 610 HP with the W-2 heads.
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It was made for the street. It idles cleanly at 800 rpm but likes it better at 1,000-1,200 rpm.
Don't that beat all. We didn't have full throttle for the last day on the dyno. Now I'm just going to wonder what may have been, 'cause it's not going back on to see what that little difference may have made.
RAMM
Well-Known Member
You must be using SF's hydraulic/water actuator. I ditched that problematic system and went to push/pull cable and haven't looked back. Nice job BTW that is big power to be sure. J.Rob
The horsepower? We'll never know.
It's not a high winder with the lack of cylinder head cross section, so 6,300 rpm.
Hydraulic/water actuator, exactly. And thank you.
I didn't get to drive it, because I was surfacing a flywheel at the time, so Cody took it out. 25.5" P245 55R15 M/H Racemaster tire, 3.91 gear, 3,500 stall and a forward shift manual valve body. He says he can leave it 3rd, pull away from a stop and drive it without bothering to shift.
Lustle
Well-Known Member
1.455 HP per cube? That sounds like a great street engine to me! Very nice work IQ52. I always enjoy seeing yourself and RAMM and others share their insights. Give's us average joes an idea of where to go with an engine.
I'm curious if you got that timing sorted? And has it made a run down the new 1/8 mile track yet? I'm curious to see what kind ET/MPH it pulls.
I'm curious if you got that timing sorted? And has it made a run down the new 1/8 mile track yet? I'm curious to see what kind ET/MPH it pulls.
Locking the distributor did nothing for me and I couldn't set the timing with the new ignition box because my laptop didn't have the required operating system on it.
I don't think they will let him run the car. No time to replace the drivers side cardboard rear seat window with a glass window. There is no driveshaft loop. It's going to need a certified cage.
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