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| Merlin iron heads | Login/Join |
DRR Trophy |
Anyone have any idea what kind of HP you can make with these? In greed we trust...So where's my money at? | ||
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| DRR Elite |
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 | |||
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DRR Pro |
Ed is correct, but he's prejudice towards anything 990 related  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. | |||
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| DRR Elite |
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| DRR S/Pro |
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. | |||
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DRR Sportsman |
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 | |||
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| DRR Sportsman |
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.)  1/4 - 9.60@144MPH | |||
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DRR Sportsman |
You can make them work well for what they are, but I've never held a heavier cylinder head. | |||
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DRR S/Pro |
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...... | |||
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DRR Elite |
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 | |||
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