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#77423 05/11/2007 3:26 AM | Joined: Jan 2007 Posts: 202 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2007 Posts: 202 | made from 66 to the ones made in 73 and 74 just before the integral manifold came out? Its seems that something was changed during the 73/74 years from the earlier ones. Want to put one in my full size mid 80s pick up but need to know what the difference is. Thinking of going with a balanced 250 and a mild cam, modest headwork and roller rockers and a small 4bbl. Would a 470 cfm truck Avenger be too large or do I need a 390 cfm? Thanks. Henry | | |
#77424 05/11/2007 5:05 AM | Joined: Feb 2007 Posts: 385 Wrench Fetcher | | Wrench Fetcher Joined: Feb 2007 Posts: 385 | Forget the 250. The low deck Chevy 6s have a head bolt that goes into the area behind the water pump, causing a weak spot. The 292 has a 'high deck' and the head bolt doesn't go into the water passage.
Buy Leo Santucci's book. There isn't much it doesn't cover, including the fact that if you run your engine at less than 4000 RPMs most of the time, a carburetor larger than about 300 cfm will cost you torque, although it may increase horsepower.
195? Chevy 3800 dump truck
1973 Chevy C30 cab and chassis
1987 Suburban 3/4 ton 6.2L Diesel
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#77425 05/11/2007 5:21 AM | Joined: Jan 2007 Posts: 202 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2007 Posts: 202 | Thanks for the reply. I already have Santucci's book. Read about all of it. A great source of info. Had a couple of 250s and a 230 and they ran just great. The 292 is definately a stump puller. Major torque and you can get grunt cams for it. Pulls like an 8 but more room under the hood and a simple reliable design. Thanks again. Something to think about. I did find a 292 two days ago that would be a good rebuilder. Hmmmm. Henry | | |
#77426 05/11/2007 6:17 AM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | There's really nothing wrong with the 250, if that's what you have, then use it.
AFAIK, the early head can be put on the integral head 250 just fine.
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A lone amateur built the Ark. A large group of professionals built the Titanic. | | |
#77427 05/11/2007 9:39 PM | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | The 71 up had valve seat inserts for unleaded gas. About 72 up had EGR system in the manifolds.About 68 they put the temp sender on the top of the head. Some of the 65-66 ,s might be 230,s. Thats about the only differences.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | |
#77428 05/12/2007 3:51 AM | Joined: Jan 2007 Posts: 202 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2007 Posts: 202 | Thanks for the replies. This is such a great site. Good people here and helpful. One thing I noticed was that in the LMC catalog, CC45 edition page 154 for a points distributor are for 73 and 74 only. I did not know that they distributors were different verses the earlier inlines. Maybe they were shorter??? Wouldn't they be all the same? Going to order an inline next week and sell this 350 I have. Runs awesome and smooth but for the amount of the running I do its not practical. Would a 2bbl from a 350 be plenty of cfm for the 250 with a mild rv cam? I don't want to over or under carb it. Henry | | |
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