Ran a spare 385CI LT1 on the engine Dyno today, stock heads.
#1
TECH Apprentice
Thread Starter
Ran a spare 385CI LT1 on the engine Dyno today, stock heads.
On the engine stand
On the Dyno
449TQ @ 4700 437HP @ 5400
Heads - STOCK 95 Corvette, no porting, gasket matching, anything done to them besides new Intake valves because the old ones were pitted from water sitting on them.
Pushrods - 7.050" 5/16" Comp Hardened Pushrods
Guide Plates - GM Performance 14011051 Guide Plates 5/16"
Lifters - XLR-8602: .842” SB Chevy, captive tie bar
Springs - 1.290" Beehive Spring 130 lbs @ 1.800", 318 lbs @ 1.200"
Retainers - L.W. Steel Retainer 11/32" 7-degree
Intake Valves - Manley 10576-8
Exhaust Valves - Stock 95 Corvette
Intake Manifold - GM Performance 24502592
Rocker Arms - 1602-16 - Comp Cams Ultra Pro Mag
Camshaft - Intake/Exhaust @ .050" 231/234 .564"/.545" 110 LSA
Carburetor - Holley 0-80770 770cfm Vac Sec
Distributor - 8361 - MSD Pro-Billet Distributor
Wires - MSD 31239 - 8.5mm
Oil Pump - 10554 Melling Select
Timing Set - Cloyes 9-3145 Double Roller
Water Pump - Meziere #680-WP118HD
Harmonic Balancer - 917269 ATI Super Damper
Flexplate - TCI 399174 153 tooth
Pistons - JE Flat Top -5c 4.040"
Crankshaft - Eagle 4340 Forged 3.75"
Connecting Rods - Eagle 6" H-Beam
Head Gasket - Cometic Gaskets C5645-040 4.040" Bore .040" Thick
Rod Bearings - CB663HN Clevite 77 - Didn't realize when you order one you only get one bearing, lol.
Rod Bolts - "Eagle" ARP 8740
Head Bolts - ARP 134-3603
Main Bolts - ARP 134-5001
Main Bearings - Clevite MS909H
Valve Covers - Proform 141-131 - Center Bolt
Timing Pointer - 51265 - JEGS Adjustable Billet Timing Pointer -http://www.jegs.com/i/JEGS-Performance-Products/555/51265/10002/-1?parentProductId=751034
Probably can't run this in a real car with all the belts, but it worked great on the dyno. Make sure to loctite the adjustment screws, they like to vibrate off. The length of bolt was 5" to get into the timing cover.
Headers - 70-2239 - Pace Setter Painted Headers - Burned that paint off in 5 minutes.
Header Bolts - 400-1209 - ARP - These things are the ****, 3/8" head that you can get at no mater how screwy the headers are.
Flexplate Bolts - Arp 100-2901 - These bolts have such large heads that I was not able to get a socket on to tighten them because of the material around the pilot bearing area on the crankshaft. Had to use some small head flexplate bolts.
I had absolute hell with starters for this engine, because of the how the dyno mounts most starters just don't work without grinding on them.
Intake, Exhaust, Water pump, Oil pan, Timing Cover Gaskets were all Fel-Pro
This was the original engine block for this car, but a wrist pin snapped on the stock motor.
#4
11 Second Club
iTrader: (1)
IMO 14% is a bit of a pipe dream.
The largest database of engine dyno to rear wheel dyno numbers we have is Golen's stuff and their 440hp motors as a rule put down a blistering 325-335rwhp. Much of that difference is likely due to his Land-air-sea dyno which is pretty well recognized to put out marketing numbers rather than honest ones.
I will guess more like 360rwhp with a large amount left on the table when you go back and do heads later.
Seems like the stroker shortblock was a repair not criticizing the stock heads, looks like it was just what you needed to do to get her put back together.
Would be great to see chassis dyno numbers later.
#6
TECH Apprentice
Thread Starter
http://s20.photobucket.com/albums/b2...t=MOV04906.mp4
video of me blowing the dyno muffler off the passenger side with the 396.
Trending Topics
#8
Those are very nice numbers and it gives me something to shoot for when I build my carbed 383 for my S10 blazer. By the way what compression are you running and whose the cam made by?
#10
TECH Apprentice
Thread Starter
I got the cam from this guy. http://www.jonescams.com/ I talk to him on speedtalk.com
Yea man, I have so many spare opti parts laying around, it was enjoyable to plug that opti hole on the timing cover.
#13
Moderator
iTrader: (33)
Good numbers. When I see stock heads on motors like that, I always think those are the kinds of set ups certain cylinder head manufacturers use to come up with their "gains" that they use in advertisements. It's still a cool set up and I bet even if you put as is in to a older project car it would be a fun motor, get the heads done later and have some thing really fun.
#16
TECH Apprentice
Thread Starter
Yea, I probably could have run it higher. However it was my first time actually running the dyno and I was a little chickenshit. **** gets really loud at 6K, and it is a dual plane manifold, I doubt there was too much to be had after that.
#17
11 Second Club
iTrader: (1)
I know you are all about heads but I think you can agree with me that everything else on this engine is actually not that cheap. It is cometic gaskets so I can pull the heads off whenever I please and put new ones on. I just will have these heads laying around, which I hate. To be honest I might get them ported and run it again.
Yea, I probably could have run it higher. However it was my first time actually running the dyno and I was a little chickenshit. **** gets really loud at 6K, and it is a dual plane manifold, I doubt there was too much to be had after that.
Yea, I probably could have run it higher. However it was my first time actually running the dyno and I was a little chickenshit. **** gets really loud at 6K, and it is a dual plane manifold, I doubt there was too much to be had after that.
I did not mean to criticize the build atall, I thought you were clear about the heads being spares not what you would have chosen for a full build as evident by your other engine. My comments were at those who think this is some spectacular result and a recipe that should be copied. You had a decent spare shortblock and spare stock heads and threw them together. I get that the others don't.
I think you would agree there is probably 80hp+ in porting those heads based on heads/cam cars with less duration topping 400 and even 420rwhp.
Again no criticism I just think a few of these guys are missing the point of what you did here.
I also think you are right that the dual plane was going to limit rpm and I have witnessed a 502 at 7000rpm on the engine dyno in person and the assault on the senses is something. I am sure it takes some working up to to really push on engines when in control. It in no way compares to sitting in a car a few feet from the engine. The concrete of the building acts as a giant low frequency speaker, the noise cuts through you. I know that wont make sense to those who haven't experienced it.
#18
TECH Apprentice
Thread Starter
I ran a 360 CI SBC .060" over, flat top pistons, stock valvetrain, stock thinwall casting heads, and a mild RV cam on the same dyno. The RPM isn't nearly the same, but I guess I just run what I have.
Rev TQ Corr BHP Corr
3200 323.5 197.7
3300 361.9 229.3
3400 421.5 273.1
3500 431.7 290.7
3600 430.6 296.5
3700 427.9 302.4
3800 424.2 307.5
3900 418.5 311.3
4000 413 314.9
4100 407.5 319.8
4200 403.6 324.1
4300 401.3 333.8
4400 398.8 334.7
4500 384.4 330.3
I'll never make an all out SBC/LT1 so this is just me having fun. My near plans are to chase HP with a BBC which I'll dyno. I'm pretty sure this is the last LT1 that I'll have to build. I already have a carb'd LQ4 that may get dyno'd in the near future.
Rev TQ Corr BHP Corr
3200 323.5 197.7
3300 361.9 229.3
3400 421.5 273.1
3500 431.7 290.7
3600 430.6 296.5
3700 427.9 302.4
3800 424.2 307.5
3900 418.5 311.3
4000 413 314.9
4100 407.5 319.8
4200 403.6 324.1
4300 401.3 333.8
4400 398.8 334.7
4500 384.4 330.3
I'll never make an all out SBC/LT1 so this is just me having fun. My near plans are to chase HP with a BBC which I'll dyno. I'm pretty sure this is the last LT1 that I'll have to build. I already have a carb'd LQ4 that may get dyno'd in the near future.
#19
TECH Enthusiast
Join Date: Oct 2011
Location: Apopka FL
Posts: 556
Likes: 0
Received 0 Likes
on
0 Posts
lol i understand. i had a 3216b marine engine let go on the dyno. man what a mess. hole was big enough you could damn near stick you head through.
#20
8 Second Club
iTrader: (2)
This is my factory block from my car. I had a 385 built took it apart to fix a oil leak and found a scuff in one of the back 2 holes. My brother had just finished building a 396 out of a 95 vette block so he took my Dart heads and slapped them on his vette block. So now we have two built short blocks.
396
http://s20.photobucket.com/albums/b2...t=DSC04941.jpg
396
http://s20.photobucket.com/albums/b2...t=DSC04941.jpg