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stickshifter 
AMC Addicted 
Joined: Jan/17/2008 Location: Bed Rock Status: Offline Points: 573 |
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 Posted: May/27/2022 at 5:28am |
 In my experience, Cometic/MLS gaskets are good to about 1000hp. Past that you need copper and hoops.
Edited by stickshifter - May/27/2022 at 6:18am |
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 7.03 @ 196 mph
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stickshifter
AMC Addicted
Joined: Jan/17/2008 Location: Bed Rock Status: Offline Points: 573 |
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Posted: May/27/2022 at 5:39am |
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This is the water seeping out around a spark plug hole on brand new heads after the first install. I learned my lesson.
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7.03 @ 196 mph
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stickshifter
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Joined: Jan/17/2008 Location: Bed Rock Status: Offline Points: 573 |
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Posted: May/27/2022 at 6:16am |
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While I'm at it, here are a couple more things to be concerned about with the Indy heady.
The half size outer bolt bosses crack. They are very thin there and need to be welded and then machined.   And be ready to weld in the ports as needed.  |
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7.03 @ 196 mph
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BBO UK
AMC Nut
Joined: Feb/17/2020 Location: UK Status: Offline Points: 288 |
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Posted: May/28/2022 at 5:08am |
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Thats a lot of adjustment work for any new product, and is what I`d heard about them, need a lot of work. I think a set of "bolt on" Edelbrocks makes more sense for most of us, but love your 1000hp Gremlin.
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sweatlock
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Joined: Apr/28/2014 Location: Largo, FL Status: Offline Points: 3313 |
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Posted: May/28/2022 at 7:17am |
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If you can get the Eddy heads. And if you can afford them. And I’ve heard they also need work on the factory valve job.
Jcisworthy has shown you can get a lot of flow out of stock dogleg exhaust port heads and they’re readily available - the best choice for street cars/95% of us are iron heads that have been ported by someone who knows what they’re doing to make very good power. And when done by someone like John, for less $$$ than just the purchase price of the Eddy heads, let alone any additional work they may need.
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jcisworthy
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Joined: Jul/23/2009 Location: North Carolina Status: Offline Points: 2805 |
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Posted: May/30/2022 at 5:04pm |
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Thanks for sharing your information Kevin. There is going to be some welding and surfacing. Should have it back together in a couple weeks.
Sweatlock Thanks for the kind words. The factory heads are very good for the majority of applications with some targeted work and can support great power with more or full porting. Takes a lot of work but I have grown to like making my own shapes. The Edelbrock heads are an excellent option but for porting, I feel they missed an opportunity to make better short turns. They did not leave a lot of short turn to work with for some reason. Still a good product and they make good power
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Specializing in dyno services, engine building, and cylinder head porting
rbjracing.com Phone Number 518-915-3203 |
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72gremx401
AMC Apprentice 
Joined: Oct/02/2014 Location: bc Status: Offline Points: 123 |
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Posted: May/30/2022 at 9:16pm |
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If Edelebrock had made it high flow , would it have compromised those who purchased them for stock replacement ? such as low end torque .
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1972 gremlin x 401
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Trader
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Joined: May/15/2018 Location: Ontario Status: Offline Points: 6881 |
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Posted: May/30/2022 at 10:32pm |
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High flow is always good IMO. Camshaft selection can optimize low end torque with a high flow head. It's always a package deal when building an engine for a drivetrain/purpose/budget.
Don't think you can build AMC cast heads any more vs Edelbrock's off the shelf for the same $ unless you can DIY. Buddy is just having a 401 built with 502's flowing 300 CFM and it's $8500+ and he still needs headers. Would not build his engine this way for his purpose/drivetrain ... but not my $. Have learned a lot from John, Ken, Greyhound ... and being a math geek - engines need head flow. Throw everything else you want at them, making a head flow, especially optimizing the intake charge, will work. Indy's don't seem to be economical, unless building for maximum performance. |
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bigbad69
Supporter of TheAMCForum 
Joined: Jul/02/2007 Location: Ottawa, Ont. Status: Offline Points: 6668 |
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Posted: May/30/2022 at 11:17pm |
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69 Javelin SST BBO 390 T10
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BBO UK
AMC Nut
Joined: Feb/17/2020 Location: UK Status: Offline Points: 288 |
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Posted: May/31/2022 at 3:59am |
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CFM X 2 = Hp (approx) Stock 502`s 220cfm max Hp = 440 (approx) So if you want 500Hp your going to need more head flow, which is where Edelbrock comes in at 248cfm ( 248 X 2 = 496Hp approx.) Those requiring over 600Hp will look at Indy heads, which are built for racing. But you`ll need people like John & Kevin to make them work, not really a "bolt on" option.
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