From the subject, you can see I hvae the TW center bolt G1 heads. Well, the damned roller rockers TFS recommended don't work with the center bolt heads. I can't return the rockers, they were special ordered. Has anyone redrilled their heads for a perimeter bolt pattern? Can it be done? This has been the cam swap from Hell!!!


Please!?

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Bob '89 Formula CC350
Last(lost)Member of the Elusive Great Lakes Crew
My car's homepage

 

You can get an adapter through GM for center to perimiter covers.

 

and I belive it says by the adapter that it's required for roller rockers on C.B. heads

I second the notion above.

 

Thanx guys,
But I don't think the rockers will clear. The canted angle of the valves bring them awefully close to the center boss. I don't think a thick plate will fit.

Bob

 

Sorry I'm not sure of your combo, I'll assume stock stamped steel valve covers, Crane RR's, 1.5's or 1.6's? Self aligning? My G1 heads did not have enough material in the position required for perimeter bolt holes, so I'm not sure it would work.

My G1 heads instruction sheets listed Crane p/n's for 1.5:1's, but were for use with guideplates. I opted for self alinging (omitted the guideplates) and went with 1.6:1's.

If you're having problems getting the valve covers down between the rockers, getting the valve cover adapters to fit between tehm will be even worse. Grinding would definately be required on those.

Additionally, if your problem is getting the stock stamped steel valve covers down and getting the gussets (internal braces for the holes) to go down between the roller rockers, You WIL HAVE TO GRIND the supports in the valve covers. THis includes grinding away at the bent over lips of the gussets in all places, and grinding flats on each "washer" that is at the bottom of the tube that the center bolts go down through. This will begin to give you the clearance for the valve cover and the gussets to go down over and between each rooler rocker.

Let me know if you have other questions.

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KevinP92Z
92 Z28 383 SLP cam,SLP headers,SLP 2ontheLeft,Trick Flow TW heads & pistons,Edelbrock base,Accel SuperRam,52mmTB,Scat Crank & forged ConnRods,MSD 6AL,SLP convertor,Baer 13/12" Track,Moser axles,Hotchkis,Genuine GM 3.42s,SLP HD Torsen,17x9" chrome SS rims
96T/A w/SLP Ram Air,SLP 2ontheLeft, Bilsteins, Baer, Hotchkis, Genuine GM, Torsen
76 4X4 Blazer 400TPI project

 

I had the same problems with my rockers(Crane Gold 1.5's)The base part of the rocker arms was machined(ground some off).Now its working perfectly

Daz
L98 /TFS G1 heads

 

Kevin,
The rockers are Comp Cams Pro Magnum RRs. The intake rocker was design specifically for the G1 head. They are 1.52:1 and non-aligning. I wish now that I had gone with the Crane's, but that doesn't help me now. It would apear that the screw to hold down the cover goes thru the trunion of the intake valve. No amount of grinding will help that.

 

Bob, I replied to your e-mail, but being Friday and you may not have access to home mail during the day, here's what I sent:

"I first used Crane's self aligning (narrow body) 1.6:1's p/n 10758-16.

When I went to my 383, I bought a new set to keep from spending any time cleaning up the old ones (I'm installing them this weekend on my wife's 96 T/A w/Ram Air.

This time, I bought the GM Performance p/n 12370839. They're made by Crane for GM and are just like the "Gold" ones but they're clear anodized. This p/n is for the 3/8" rocker studs, but they have them in 7/16 also (the ones used on the LT4 which were blue).

I went with the GM p/n's because they were ~$15-20 cheaper through places like Scoggins-Dickey or Jim Pace Ponitac, then the Cranes were through Summit or Jegs."

These are both 1.6:1 p/n's but they should be able to get 1.5's if that's what you want.

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KevinP92Z
92 Z28 383 SLP cam,SLP headers,SLP 2ontheLeft,Trick Flow TW heads & pistons,Edelbrock base,Accel SuperRam,52mmTB,Scat Crank & forged ConnRods,MSD 6AL,SLP convertor,Baer 13/12" Track,Moser axles,Hotchkis,Genuine GM 3.42s,SLP HD Torsen,17x9" chrome SS rims
96T/A w/SLP Ram Air,SLP 2ontheLeft, Bilsteins, Baer, Hotchkis, Genuine GM, Torsen
76 4X4 Blazer 400TPI project