74 BB Rochester Quadrajet Bolt Question

[Victor S.]

Could someone please give me the original factory bolt size and head markings of the the four carb to intake manifold bolts?

Thank you,
Vic

[Robert R.]

Re: 74 BB Rochester Quadrajet Bolt Question

Vic,
On my ‘74 454, the head marking of the front 3 3/4” bolts is an “H” encircled by a “C” as is one of the rear 1 1/4” bolts. The head marking of other rear bolt is “AS”. All bolts have 1/2” heads and are grade 5. BTW, the head marking on my ‘74 small block carb is the h encircled by an c. Hope this helps.
Bob

[Victor S.]

Re: 74 BB Rochester Quadrajet Bolt Question

Thanks Bob - I have misplaced my bolts and the JM is not clear on the size - it did not specify the front and rear sizes being different - this helps!