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Jul 21st, 2025 | | | | Joined: Oct 2000 Posts: 98 'Bolter | | 'Bolter Joined: Oct 2000 Posts: 98 | I just bought some headers for my 250 from ftyler. Now to install them. I have read somewhere that you should replace the alignment pins that are in the front and back of the head with actual bolts or studs.
Is this necessary to get a good seal?
What is the process and recommended bolt/stud?
Thanks!
Mike Kelley
1966 Chevy C10 SWB - 250 L6/S10 T5
2002 Chevy Ext 1500 4x4
Http://myol66.wordpress.com
| | | | | Joined: Sep 2006 Posts: 841 Shop Shark | | Shop Shark Joined: Sep 2006 Posts: 841 | i have heard that too it is logical, you would need to have pressure at both locations since the headers are two pieces instead of 1 long ex manifold. i am using the shortest 3/8 nc manifold grade stud i could find. the longer ones seem to be in the way. | | | | | Joined: Oct 2000 Posts: 98 'Bolter | | 'Bolter Joined: Oct 2000 Posts: 98 | Does the old alignment pin screw out?
Mike Kelley
1966 Chevy C10 SWB - 250 L6/S10 T5
2002 Chevy Ext 1500 4x4
Http://myol66.wordpress.com
| | | | | Joined: Feb 2000 Posts: 4,886 'Bolter | | 'Bolter Joined: Feb 2000 Posts: 4,886 | The pins are just 3/8" bolts turned down. Yes they unscrew, but there is coolant behind them! You need to use thread seal on the new bolts, atleast on one of my heads I did. I would all so use plenty of high heat sealer on the gasket, both sides and tighten the bolts alittle at a time working across the header flange. Joe | | |
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