Intake bolt question.

[Hemi2Much]

I've heard that on the early 426 Hemi, the intake bolts were hex head, and later they went to an Allen head type bolt.
Can anyone confirm this and if so when did they make this change?
Thanks, JKent

 

[AR67GTX]

The reproduction kit for 66/67 is a combination of 10 socket head and 6 dowels/nuts for what that’s worth. Might ask dadsbee what his early 66 Hemi has.

 

[Hemi2Much]

I ordered a complete master kit from RTSpecialties, I've seen other kits on eBay and other sites that have the same amount of bolts but they show allen head bolts for the intake.
I thought the earlier Hemi's had hex head bolts for the intake.

 

[tonysrt]

My crate Hemi in 02 had hex head bolts, but I bolt a set from Mancini and they were the 10 point head bolts.

 

[Runcharger]

I heard the first Street Hemis were allen head bolts, soon after introduction they went to the hex head/stud combo.

 

[64BEL]

Not the greatest picture, but this shows that mine are mostly Allens with 2 studs/nuts and at least one hex. The assembly date was April of '66.

 

[AR67GTX]

That looks similar to the AMK 66/67 kit I bought except that the 4 corner fasteners were also studs with hex nuts, 6 altogether. It wouldn’t be the first less than totally correct part I’ve bought for the car though.

 

[Dragon Slayer]

Originally they were 10 allen head including extra 6 for china wall with 6 studs with hex nuts. Unfortunately, over torquing the china wall bolts would break the manifold. So they quickly moved to roll pins only at china wall. 66-67. 68 they moved to hex head bolts, plus the 6 studs. Nothing on china wall.

 

[Hemi2Much]

Not the greatest picture, but this shows that mine is mostly Allens with 2 studs/nuts and at least one hex. The assembly date was April of '66.

View attachment 1409123

Thanks for the picture.

 

[Chi Town Runner]

Question.
I don't have a Hemi but am a HUGE fan of the Elephant.

What is/are (China Wall)?

 

[Dragon Slayer]

Slang I guess for front and rear of block where manifold seals. RB has same were intake pan seals against.

 

[dadsbee]

Yep, like the Great Wall of China. Narrow and tall.

 

[Chi Town Runner]

Got it.
Thanks all for the info...

 

[6PKRTSE]

My intake is all stainless steel studs along with every else on the engine is studed. However, not really OEM any longer. I tried to keep thing some what stock looking though.