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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jan 2008 Posts: 18 New Guy | | New Guy Joined: Jan 2008 Posts: 18 | I have a GMC '48 453 with a 270 engine. Are all the exhaust manifolds the same size from the 228 to the 302 size? | | | | | Joined: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | An oe part number 6107434 fits 228-302. It was superseded by 2194274. I think a later 302 has a larger exhaust flange but I think they would all bolt to the head. | | | | | Joined: Jan 2008 Posts: 18 New Guy | | New Guy Joined: Jan 2008 Posts: 18 | the exhaust manifold casting no# on ours is 2180407P any ideas on whether I could use a manifold off a 248? | | | | | Joined: Jan 2008 Posts: 18 New Guy | | New Guy Joined: Jan 2008 Posts: 18 | Our manifold had a 3 bolt exhaust flat flange with preheater counterbalance | | | | | Joined: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | I think they all had a 3 hole flange and a heat riser. Casting numbers are not necessarily part numbers and different parts books use different part numbers due to revisions. Gasket sets were sold to fit 228-302 but some gaskets were not used. I think the exhaust gasket was the same, but the intake was larger on a 302. I still think a 302 manifold would fit your 270. | | | | | Joined: Jan 2008 Posts: 18 New Guy | | New Guy Joined: Jan 2008 Posts: 18 | Thank you,our manifold was found cracked in half and are trying to find another. As always you all have helped to make our dream come back to life! | | |
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