Community Q&A Question: head bolts

Asking About: Mustang Arp High Performance Series Hex Head Bolt Kit - 7/16" (79-95)


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head bolts

Dumb question, recently bought these lovely ARP bolts for a 306 I'm putting together. Now I'm starting to double think, I have the intention of throwing on some GT40x heads. What the question is will these ARP's fit the GT40X head?
from Vankleek Hill |
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I am sorry I didn't clarify that better. Be sure and use the intake gasket M9439A50 or equivalent as well.
from TROY |
0 0 LMR.com Staff Member Post!


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Yes these will fit those 302 heads.
from TROY |
0 1 LMR.com Staff Member Post!


Technically they will fit through the GT40X heads, but to properly install GT40X heads on a 302 block you must use step down washers. All GT40X heads use a 351W size bolt hole (1/2"), where a 302 uses a 7/16" head bolt. Christopher F. needs to use the head bolt kit with part number M6065D289, otherwise he will risk head movement and blown gaskets. - Brian last year
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