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Author Topic:   Iron eagle platinum heads
Alltel
Dirt Maniac

Total posts: 180
posted April 10, 2005 06:46 PM  
Has anyone had problems with the pushrods clearing the intake runners on these heads, and what about problems with the rocker arms hitting the valve springs? I got a set with the 1.550" roller springs by accident, and when I put them on I noticed that the rockers would not even slide down the studs, because the studs and valve springs are so close, and the push rods hit the sides of the holes in the heads. I sent them back and am waiting for the solid lift heads, but I'm wondering if I'm going to have the same problems, and what to do?

speedy46
Dirt Maniac

Total posts: 165
posted April 10, 2005 07:09 PM  
the platinum heads are JUNK if u get them stright from dart and assemble them they WILL NOT SEAL and u need to send them to a machine shop and get new seats cut and looked over

racer2
Dirt Freak

Total posts: 352
posted April 11, 2005 06:43 AM  
yes on a set of 49 cc,sent them back they opened up the pushrod holes but rockers were not centered on the valve 100 % but they worked..what a pain..

HERNDON
Dirt Full Roller

Total posts: 73
posted April 11, 2005 11:59 AM  
I'm with you fellers. There is so little room for the pushrod clearance that actually getting the guide plates on correctly is a nightmare. I really thought I was doing good to buy these new 49cc heads over my 64cc Pro Actions. And no domes either?!?!?! Never again.

rickbraley
Dirt Full Roller

Total posts: 58
posted April 11, 2005 03:34 PM  
Yes, this is a known problem at Dart. Apparently any heads manufactured before 12/3 were not machined properly for the pushrod clearances on the intake side. Dart informed me of this and they reworked mine for free. I have also had the same problem with my rocker arms. I had to remove material from the rockers to get them to clear the 1.550" springs. Dart tech support informed me that the rockers will not be perfectly centered on the valve stems and this is acceptable.

speedy46, what did you do to the seats to get them to seal? I assume you installed them and used a leak-down tester to measure the sealing of the valves to the seats?

Alltel
Dirt Maniac

Total posts: 180
posted April 11, 2005 03:50 PM  
First ones came from dart, new ones are coming from JR. Should I expect the same problems?

speedy46
Dirt Maniac

Total posts: 165
posted April 11, 2005 06:06 PM  
alltel if u are getting your new heads from JR in ankeny they will be done right because i work there and our head guy has done hundreds of these heads


PS rick we just had to recut the seats in all the heads cause the seats from dart our out of round they 5 thousanths of runout and we only settle for 1 thousanth which is a pain cause we pay to much for these heads as it is to have to recut the seats in every head we sell

HERNDON
Dirt Full Roller

Total posts: 73
posted April 12, 2005 02:31 PM  
Alltel, I ordered mine from JR and they sent the wrong studs. Got them off the ebay auction, then got the runaround from JR. I'm sure it was an honest mistake, but they never did rectify the situation. Had to buy a new stud girdle to race that weekend. just food for thought

Alltel
Dirt Maniac

Total posts: 180
posted April 12, 2005 03:01 PM  
I got enough stuff to make them work, just don't want to have to send them back to be machined and lose another week of racing. JR has been real good to me so far, that's why I order heads from across the Country.

SSRACER4
Dirt Roller

Total posts: 12
posted April 13, 2005 07:45 PM  
My friend bought a set, machine work is terrible. Sent them back to dart they fixed the problem but more arose. Pushrod holes where cut threw into the intake runners. haven't heard bout the rocker arm clearence, i'll call the engine builder and let him know.

Jesse
J & F Race Shop www.jandfraceshop.com

RACEINMUD
Dirt Freak

Total posts: 323
posted June 24, 2005 02:15 PM  
Anyone know if Dart got the casting problem fixed? I would like to get a set of the 49 cc heads for my 400 but am a little hesitant due to what I've read. Thanks, Race

waltonjr1
Dirt Forum Champ
Total posts: 516
posted June 24, 2005 11:00 PM  
I just spent two hours today removing material from the pushrod holes with a die grinder and this was on regular 49cc iron eagles. The heads were new but they were cast last year. Its ashame the money you spend for something that is that far off from being right, I had to grind my a** off to free the pushrods up.


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