OEM GM 3748770 Cylinder Heads 1958 Corvette 283 Dated Feb 58 No Porting 58 X X58

This is a pair of original GM 3748770 cylinder heads. To my knowledge, the 3748770 heads were reserved for 1958 Corvette applications only. These heads have casting dates of B 4 8 and B 11 8 as shown. These dates decode as February 4th and 11th, 1958. These are also known as 58X or X58 heads do to the external cast "X 58" below the exhaust ports. These are very hard to find factory 1958 high performance heads. These heads are in good condition overall. Both heads recently has the valves and springs removed and were cleaned and magnafluxed for cracks by Santa Cruz Auto Parts in Santa Cruz, CA.…
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2021 KTM 250SXF Cylinder Head with Valves & Race Tech PRO Racing valve / porting

2018 - 2021 KTM 250SXF cylinder head with Race Tech factory race porting and valve job. Complete with valves and cam caps. Low hours, raced 3 times. Super fast, with better low end, works great. Note: Vortex used with this set-up also listed on my site. The item "2021 KTM 250SXF Cylinder Head with Valves & Race Tech PRO Racing valve / porting" is in sale since Thursday, November 18, 2021. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle Parts\Engines & Engine Parts\Cylinder Heads & Valve Covers". The seller is "chrysler-w" and is located in Highland, California. This item can be shipped worldwide. Modified Item: Yes Manufacturer Part…
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Ford Crossflow Xflow Cylinder head Porting CNC Machining

Ford Crossflow Xflow Cylinder head Machining. Resurface all gasket faces and rocker mount. CNC machined guide bore for bronze guides and correct valve spacing. Offset guide bore machining available at an additional cost. Machine spring platform to provide correct spring installed height. Install and hone guides. Counter bore valve throat to 85-90% valve size depending on application. Cut valves to equal depth. 4 Angle valve seats. Hand port seat throat and bowl. Porting work is an additional cost and dependent on application. Contact number is in the last photo feel free to ask any questions. The item "Ford Crossflow Xflow Cylinder head Porting CNC Machining" is in sale since Monday,…
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