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#75501 04/05/2007 10:56 PM | Joined: Nov 2006 Posts: 8 Junior Member | | Junior Member Joined: Nov 2006 Posts: 8 | Hi everyone this is my first post so bear with me. I have a 270 G M C With a delta aftermarket cam and solid lifters. I've got about 5 hours run time on this cam, and want to know if I can switch to hydrolic lifters? Also do the push rods need to be hollow? Thanks | | |
#75502 04/05/2007 11:25 PM | Joined: May 2005 Posts: 1,624 Shop Shark | | Shop Shark Joined: May 2005 Posts: 1,624 | Look around here for other posts. The wise ones say, "If the cam was ground for solid lifters then hydraulic lifters are a no-no".
Six volt guy living in a twelve volt world
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#75503 04/05/2007 11:43 PM | Joined: Sep 2003 Posts: 324 Shop Shark | | Shop Shark Joined: Sep 2003 Posts: 324 | Welcome ballo4. You cannot put hydrolic lifters on a solid lifter cam. The ramps on the cam lobes are cut differently. This will wear out the cam or the lifters in a hurry. If you change the cam and lifters over to hydrolic it is nessary to make sure the block is set up for hydrolic lifters, some of the blocks did not have oil gallerys for hydrolic lifters.
This probably adds to the confusion but you don't need to have a bunch of metal floating in your oil. That could ruin your day. I am sure some of the outhers will weigh in soon.
Tom | | |
#75504 04/05/2007 11:48 PM | Joined: Jul 2003 Posts: 132 'Bolter | | 'Bolter Joined: Jul 2003 Posts: 132 | First, I don't think any of the GMC 248/270/302 engines were equipped with hydraulics, so the block is probably not drilled to provide oil.
Second, lifter type must match the cam grind. Solids on a solid grind cam, etc. | | |
#75505 04/06/2007 8:04 AM | Joined: Mar 2007 Posts: 3,371 Crusty Old Sarge | | Crusty Old Sarge Joined: Mar 2007 Posts: 3,371 | Welcome to the "BOLT", your at the right place for your truck. The 270 in your truck is not drilled for oil gallies to the lifter bores, so no you can't change to hydraulic lifters. As a rule cams are ground for a specific lifter and should not be used with other types. As for the push rods yes they need to be the open type for hydraulic lifter to feed oil to the rocker assemblies. Good luck.
~ Craig 1958 Viking 4400"The Book of Thor"Read the story in the DITY1960 Chevrolet C10"A Family Heirloom"Follow the story in the DITY Gallery'59 Apache 31, 327 V8 (0.030 over), Muncie M20 4 Speed, GM 10 Bolt Rear... long term project (30 years and counting) If you don't like driving yourTruck, you won't drive yourTruck..| Living life in the SLOW lane | | |
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