113 heads
Le Mans Master
Joined: Feb 2005
Posts: 6,479
Likes: 565
From: Clearwater Florida
..... Sure will ... I ran a set for 2-3 years ... I had a local machine shop drill the steam holes cuz I was running them on the street ... My biggest caution to you is to be mindful of the compression ... with dished pistons ( -14cc) I was at 11.2 : 1 and had a lot of detonation ........
Burning Brakes
Joined: Feb 2001
Posts: 769
Likes: 0
From: Granbury TX
I got a 400 cid engine from a early 70's suburbin (or what ever they called them back then). I had it machined including a .040-over bore. Put in 4130 forged crank with 6" H-Beam rods and Comp Cam roller Cam. After pluging the steam/vent holes on the block, I installed ported and polished 113 heads with all new valves and Comp Bee-Hive springs and Magnum roller-Rockers.
Runs like a dream!
Runs like a dream!
Melting Slicks
Joined: Sep 2008
Posts: 2,376
Likes: 111
From: Cherokee National Forest TN
There may be excessive compression using 113 heads on a 400 block.
Handy compression check link.
http://www.torinocobra.com/Randys_tools.htm
Handy compression check link.
http://www.torinocobra.com/Randys_tools.htm
Burning Brakes
Joined: Sep 2008
Posts: 810
Likes: 58
From: Alva Florida
I'm having a difficult time figuring out if the 113 heads are any good. People talk about how they won't get much past 300 hp and how they aren't that good. Now I see you are going to put them on a 400ci?
On my 357ci I was gonna change out my 113's for trick flow twisted wedges.
Now you make me think I'm making a mistake. Is there a definative answer on this subject?
Not to hijack your thread, but I think I'm going to go nuts over this.
By the way, good luck!
On my 357ci I was gonna change out my 113's for trick flow twisted wedges.
Now you make me think I'm making a mistake. Is there a definative answer on this subject?
Not to hijack your thread, but I think I'm going to go nuts over this.
By the way, good luck!
Thread Starter
Drifting
Joined: Oct 2006
Posts: 1,328
Likes: 14
From: Stafford Connecticut
Well it depends on how good of a porting job is done on the heads.I have read car magazine articles that claim you can get 250 cfm out of the intake ports with porting.I have also read you can make them flow worse if not ported properly.If you can't do the port work yourself you are better off going after market.My problem is I am dealing with straight plug heads on my motor and I keep burning plug wires on the exhaust.The heads on my 400 are 220 cc ports.and have good flow numbers.But I had to dimple the heck out of them to get the spark plugs in.This is even whith shorty plugs.
Last edited by steven mack; Sep 13, 2011 at 10:21 PM. Reason: add info
Drifting
Joined: Mar 2009
Posts: 1,253
Likes: 4
From: East Wenatchee (2hours from n e where) WA
Later copies of David Vizzards book Max performance small blocks on a budget has a brief discussion about porting 113s.
btw I have a fresh set that I may not be using.
btw I have a fresh set that I may not be using.
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Thread Starter
Drifting
Joined: Oct 2006
Posts: 1,328
Likes: 14
From: Stafford Connecticut
The factory seats can be cut to use 2.00 intake and 1.6 exhaust valves.If your machine shop has a serdi seat cutter he can cut the seats and put a three angle valve job on at the same time
Thread Starter
Drifting
Joined: Oct 2006
Posts: 1,328
Likes: 14
From: Stafford Connecticut
I have been doing some gasket measuring and it looks like there is only enough room for a stock bore 400 gasket before the fire ring intersects the spark plug cooling water port.Stock 400 gasket bore size is 4.165.I have a 30 over bore on my 400.It will be close.I have used the 4.165 stock gasket on a 30 over bore 400.It just depends on how much chamfer I put on the top of the cylinders.
Drifting
Joined: Mar 2009
Posts: 1,253
Likes: 4
From: East Wenatchee (2hours from n e where) WA
btw Impretty shure you need to drill steam holes in the heads when used on a GM 400 block. There are instructions on AFR's site as well as Vizzards book. From what I have read 113's will support about 375 HP with great throttle responce. What do you plan for the rest of the engine?
Thread Starter
Drifting
Joined: Oct 2006
Posts: 1,328
Likes: 14
From: Stafford Connecticut
Right now the motor has Comp cam cc305 roller cam with 510-510 lift 220-230 dur.retro roller lifters and roller rockers.I have Engine Quest 220 cc heads on it right now. SLP runners opened up and siamesed 3/4's of the way down.The motor should be good for at least 450 horse power.But as stated above the heads have straight spark plugs and I have to really dimple the exhaust manifolds so I don't burn the plug wires.The rest of the exhaust is two an one half inches with a magnaflow high volume cat and Magnaflow mufflers.I am seriously thinking of going with the Fast EZ efi computor system for TPI.
Safety Car
Joined: Sep 2001
Posts: 4,157
Likes: 554
From: Glenbeulah Wi
Right now the motor has Comp cam cc305 roller cam with 510-510 lift 220-230 dur.retro roller lifters and roller rockers.I have Engine Quest 220 cc heads on it right now. SLP runners opened up and siamesed 3/4's of the way down.The motor should be good for at least 450 horse power.But as stated above the heads have straight spark plugs and I have to really dimple the exhaust manifolds so I don't burn the plug wires.The rest of the exhaust is two an one half inches with a magnaflow high volume cat and Magnaflow mufflers.I am seriously thinking of going with the Fast EZ efi computor system for TPI.
Thread Starter
Drifting
Joined: Oct 2006
Posts: 1,328
Likes: 14
From: Stafford Connecticut
I agree. I don't want to go to long tube headers and I can't find any shorty's to fit.I really don't want to change my heads they have good flow numbers supposedly close to AFR's.
Advanced
Joined: Jan 2009
Posts: 61
Likes: 0
From: Albuquerque NM
If you are on a budget, you can get some decent flow out of them. They are a nice upgrade for a stock style TPI especially with a mild roller cam. That said, the technology is over 20 years old. They would certainly not be apart of any serious upgrade to your top end. A set of AFR Eliminator heads, a Comp XFI cam and a Superram intake with some ECU tuning will give you 80 to 100 horsepower over anything you could do with the 113 heads and the stock style TPI. So if you're are looking for a nice upgrade to your current set-up, 113s might not fill your needs since you already have upgraded your heads although I'm not familiar with Engine Quest products. If you are eventually looking for big horsepower, 113s would not be part of the equation. I would definetly look to upgrade my exhaust if your still using the stock cast iron manifolds.
Last edited by Bilster; Sep 22, 2011 at 12:46 PM.
Advanced
Joined: Jan 2009
Posts: 61
Likes: 0
From: Albuquerque NM
I'm having a difficult time figuring out if the 113 heads are any good. People talk about how they won't get much past 300 hp and how they aren't that good. Now I see you are going to put them on a 400ci?
On my 357ci I was gonna change out my 113's for trick flow twisted wedges.
Now you make me think I'm making a mistake. Is there a definative answer on this subject?
Not to hijack your thread, but I think I'm going to go nuts over this.
By the way, good luck!
On my 357ci I was gonna change out my 113's for trick flow twisted wedges.
Now you make me think I'm making a mistake. Is there a definative answer on this subject?
Not to hijack your thread, but I think I'm going to go nuts over this.
By the way, good luck!
113s good. Owned a stock set and a ported set.
Trickflow twisted wedge better. Owned two ported sets. Both flowed nice but were a pain to set up. Different valve lengths for intake and exhaust.
Ported Vortecs. Owned two sets. One factory and one set of RHS Vortecs. Flowed and ran better than the heads above but there is a weight penalty (heads are iron), and you need a TPI base dedicated to Vortec heads.
AFR Eliminator 195s. CNC ported from AFR. So superior to the heads above it's not funny but expensive ($1700 discounted) and really need to upgrade entire stock motor to take advantage of the upgrade.
All heads above ran with TPIS Big Mouth base and SLP runners except Vortecs which ran with a Scoggin-Dickey base.
