F3 GT40 heads require headbolt reducers?????

It depends if the heads were originally on a 351W or a 302. 351Ws use 1/2" head bolts, 302s use 7/16" head bolts. If the heads you have have been drilled for 1/2" head bolts, you need to use reducer bushings or stepped bolts. Here is a link to the bushings, and you can use standard 7/16" head bolts with them:

Trick Flow® Head Bolt Bushings TFS-51400419

While I'm on the link kick, these head bolts would serve you well:

ARP High Performance Series Cylinder Head Bolt Kits 154-3601 - HEX

ARP High Performance Series Cylinder Head Bolt Kits 154-3701 - 12-POINT

Or, you can get the head bolts and bushings as a kit:

ARP High Performance Series Cylinder Head Bolt Kits 154-3605 - HEX

ARP High Performance Series Cylinder Head Bolt Kits 154-3705 - 12-POINT

I'm actually using F3ZE heads off of a 351W (Lightning) on my 302 right now. I went with stepped bolts instead of bushings:

ARP Pro Series Cylinder Head Bolt Kits 254-3708 - 12-POINT

They're definitely not necessary and expensive, but that's what I choose back in the day. If I ever do a similar build I will just use 7/16" bolts with bushings.

Paul in LKY said:

Ya theyre 7/16 bolts. Thanks for all the advice guys, putting the heads on now. Proud of me Smurf? :gringreen Should have em on tomorrow and goin out vette huntin

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Yes very proud :bigthumbsup

There is a nice 1984 crossfire injected corvette that is ready for your beating :laugh:

But for real good luck and enjoy the ride.

Paul in LKY said:

Got one on today he he, that was the hard one had to remove the p/s pump and comp, the easy one and intake tomorrow and she'll be runnin. gonna get the motor mounts while they're right in my face. Hey anyone know the hp gains from the e-cam gt40 heads, intake,1.7 rollers, and equal length bbk's?

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Stock HP is around 185 at the wheels- you'll e at about 260 now.

Your going to need a bigger tb and maf to with the intake.