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Merlin iron heads
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DRR Trophy
Picture of vega3410
posted
Anyone have any idea what kind of HP you can make with these?


In greed we trust...So where's my money at?
 
Posts: 187 | Location: Elyria,Ohio | Registered: February 14, 2004Reply With QuoteReport This Post
DRR Elite
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Not good heads compared to what’s available today, they are a knockoff of the GM 990 head. That said they will support at least 750HP
 
Posts: 13522 | Location: NJ | Registered: August 20, 2000Reply With QuoteReport This Post
DRR Pro
Picture of HS professor
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quote:
Not good heads compared to what’s available today, they are a knockoff of the GM 990 head. That said they will support at least 750HP



Ed is correct, but he's prejudice towards anything 990 related Razz
Merlins are reportedly much heavier than oem GM stuff so that sucks. I have a set of Grumpy Jenkins heads I just acquired, I believe they are the same thing. I'll weigh them.

650-700 is easy on a 454, 700-800 on a good 496 but you suffer the weight penalty.
 
Posts: 1422 | Location: Monroe twp nj | Registered: December 05, 2005Reply With QuoteReport This Post
DRR Elite
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Laughing very hard
 
Posts: 13522 | Location: NJ | Registered: August 20, 2000Reply With QuoteReport This Post
DRR S/Pro
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The Merlin heads I saw many moons ago were Dart heads, they had improved exhaust ports for sure. Don't remember how much better the intake ports were off hand. They certainly weighed a lot more than stock steel heads for sure. I don't know what Work Products did with them since. The Grumpy version of those heads were better also. Weight is the big factor,, I wouldn't be surprised to hear that they are 20 to 25 lbs heavier per pair than stock heads.
 
Posts: 2161 | Location: Tewksbury, MA,USA | Registered: November 03, 2000Reply With QuoteReport This Post
DRR Sportsman
Picture of Steve from Pa
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I weigh a set years ago, I believe they were 76lbs each heavy sobs for sure. Jegs list their shipping weight as 88lbs.


Most important, keep the shiny side up
 
Posts: 798 | Location: Punxsutawney, Pa USA | Registered: February 05, 2001Reply With QuoteReport This Post
DRR Sportsman
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Ran Merlin's on 555ci motor for a short while. Car ran 9.8s in 3700lb 67 Chevelle.

Switched to 335 Dart Pro 1, no other change. Car went 9.6@144.

Huge weight difference and obvious HP gains. All in all, the heads performed well.

Fuse ignited. Wait for it.....



Configuration: 3350#, 582 C.I.,

60 - 1.24
1/8 - 5.53@ 126MPH
1/4 - 8.73@ 159MPH



3700#+210lb driver, FULL interior, through mufflers, 10.5 tire.
60'-1.333 (IN 4000ft DA! Joisy Math excluded; 1.25sec using JOISY MATH.) Wink
1/4 - 9.60@144MPH

 
Posts: 1451 | Location: St Marys | Registered: January 12, 2004Reply With QuoteReport This Post



DRR Sportsman
Picture of Bob Deniker
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You can make them work well for what they are, but I've never held a heavier cylinder head.
 
Posts: 622 | Location: Latrobe Pa. | Registered: July 30, 2007Reply With QuoteReport This Post
DRR S/Pro
Picture of SCDIV1
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Even the '990 or '188 heads are boat anchors like all BB iron heads

Last time I did a pair of '990's my back was not happy lugging those things around and in and out of my pickup

The aftermarket heads are even heavier for sure....

They can make good power though.....all of them....

Dart Pro-1's Aluminum are scary lightweight heads.....Even compared to a regular Dart like a 320 or a Brodix....

They do work well and I've used them a few times....Dart Pro-1 325-335. The weight savings is gonna be around 80lbs over iron anything......
 
Posts: 2733 | Location: Where ever I am, I'm here and it's me | Registered: March 15, 2007Reply With QuoteReport This Post
DRR Elite
Picture of adv ET 266
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At 80lbs each, you’ll bust a gut putting them on the block. I had bought a set when World made them. Definitely better than your std LS6 head.



2005 2000lb 4 link dragster
home brew 582 BBC Dart 355
1.058
2.98
4.629@149
6.094
7.310@185

 
Posts: 12173 | Location: 33463 | Registered: February 04, 2004Reply With QuoteReport This Post
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