How much HP can this head support?

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Krooser
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How much HP can this head support?

Post by Krooser »

I have a set of W-2 Mopar heads that flow 294 intake/180 exhaust. 13-1/alky/7200-7500 rpm/M-1 single plane/850 BG.

How many horses with a head like that support in an endurance application. I will have it dyno's but just curious.
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Re: How much HP can this head support?

Post by rustbucket79 »

550 to 600 honest hp
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Re: How much HP can this head support?

Post by mag2555 »

Assuming the intake manifold is not the cork and the right Cam with the right placement of the overlap to get into the 155% VE range and a merge collector type exh you could see 625 hp on Ally.

It would help to know how many cid we are talking about for that power band you want though!
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Re: How much HP can this head support?

Post by compguy »

"and the right Cam with the right placement of the overlap to get into the 155% VE range"

155% VE ??
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Re: How much HP can this head support?

Post by Kenny M »

We made 670 on a 388 NA on race C12 fuel at 7300 W2 Oval port 200CC 305 intake 190 Exhaust 8% loss 283 cfm with Victor Intake.
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Re: How much HP can this head support?

Post by lefty o »

compguy wrote: Sun Sep 12, 2021 8:09 pm "and the right Cam with the right placement of the overlap to get into the 155% VE range"

155% VE ??
it would take some highly optimistic dyno settings to get there on a na motor.
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Re: How much HP can this head support?

Post by CamKing »

Krooser wrote: Sun Sep 12, 2021 2:23 pm I have a set of W-2 Mopar heads that flow 294 intake/180 exhaust. 13-1/alky/7200-7500 rpm/M-1 single plane/850 BG.

How many horses with a head like that support in an endurance application. I will have it dyno's but just curious.
Those flow numbers are close to what we used to see out of the Brodix 10X heads, and they would make 650hp pretty easy with 12.5:1 compression.
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Re: How much HP can this head support?

Post by RW TECH »

I did a 419 CID SBM with customer-supplied W2 Econo heads and Strip Dominator intake, both ported back in the early 1980's. Compression ratio was 10.5:1-ish, and cam was a 264°-272° duration @ .050" with .675"-ish lift. Pump gas, 4150 carburetor, etc.

Off the top of my head I don't remember TQ (probably 540-550-ish) but HP was high 660's and fuel was very-very conservatively tuned (~.82-.84 lambda). This was a slower sweep rate with no inertia added so I'd guess it would have been 690-ish HP if it was tested the way a lot of shops do (fast sweep + inertia).
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Re: How much HP can this head support?

Post by mag2555 »

Come on gang!
No one could tell I screwed up and put a 5 where a 1 should have been?
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Re: How much HP can this head support?

Post by Adger Smith »

Back in the day those Brodix 10 X heads were a pretty good head that did things right with the right components. They had decent valve gear stability, made decent power and flow numbers, but drove down and around the track well. Used a bunch of them.
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Re: How much HP can this head support?

Post by Krooser »

Thanks guys...

This is an oval track deal running 1/2 mile dirt (mostly...some 1/3 miles).

The heads have been mildly ported...still oval shape. 4.040 x 3.79 for 388 cubes. RaceTec pistons, Crower I-beam rods and a Mopar billet crank. Wet sump. Some say the Mopar M-1 intake is not as good as an Strip Dominator but it's what I have and it's ported to match the heads.

Using 5/16" 2.02/1.60 Manley stainless valves.

I have two camshafts both sold FT. The Jones is 254@.050. .394 lift ( using 1.5 T&D rockers) 5.74/.549 at the valve. 106 LSA (IIRC)

I also have a Howards .599/.616 lift. 254/260 @ .050 on 108 LSA.

MSD dizzy with an MSD 6T analog box.

My carb is an early Barry Grant alky conversion. I added a BoLaws 850 base plate to the 750 cfm body. I'm not married to this carb but I got it with the engine. Might get a new one and keep this as a spare.

I have been fooling with this engine and car for three years. I was ready to assemble the whole deal and be trackside this season but I have had some medical issues over the fall/winter that set me way back. Knee replacement in November, two widowmaker heart attacks one week apart in December then a shoulder replacement in May. That matches the two implants I already have.

Now I'm looking at pain management for my back (five herniated discs) or surgery this fall. Just getting able to get out in the shop... still gaining strength and endurance...slooowly.

My wife sez she will sell me for parts when I die.

Thanks for your input.
Last edited by Krooser on Mon Sep 13, 2021 4:21 pm, edited 2 times in total.
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Re: How much HP can this head support?

Post by Krooser »

Adger Smith wrote: Mon Sep 13, 2021 3:29 pm Back in the day those Brodix 10 X heads were a pretty good head that did things right with the right components. They had decent valve gear stability, made decent power and flow numbers, but drove down and around the track well. Used a bunch of them.
I have friends still using those heads.
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Re: How much HP can this head support?

Post by 1980RS »

I have a pair of 10X spread port heads I would like to take the titanium valves out of and switch over to stainless valves, just need to find who makes headers for a 2nd gen Camaro or buy some used ones and make my own.
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Re: How much HP can this head support?

Post by mag2555 »

So you say they are mildly ported and attaining 294 cfm up from the stock 240 or so?
At what lift is the 294 cfm coming in at?
Is it in the range of the lift of either of those two Cams you have?
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Re: How much HP can this head support?

Post by Krooser »

mag2555 wrote: Mon Sep 13, 2021 4:44 pm So you say they are mildly ported and attaining 294 cfm up from the stock 240 or so?
At what lift is the 294 cfm coming in at?
Is it in the range of the lift of either of those two Cams you have?
.600 lift before they laid over. If I got those intake ports squared off I have been told they would do 330 cfm.

Had an old friend flow them since the PO didn't remember what they did. He has a pretty honest flow bench (and dyno) and does not sugar coat the numbers to make the customer feel better.

The wonky pushrod angles on the SBM heads cost you a bit of lift but not so much with the W2 heads which have the pushrods moved off center. But I will use 3/8" pushrods to keep as much as I can.

This engine did 575 HP when first built back in '93. Ran about 18 nights and was stored until '07 when it was put into a dirt A mod and was run cold on alky and it ultimately took out two rod bearings, the crank, four pistons three rods and one cylinder. I fixed it and it's ready to be assembled after I do some oiling modifications.
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