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Subject: Help Needed Author: Josh Shipman [ Next Thread | Previous Thread | Next Message | Previous Message ] Date Posted: 07:09:56 11/20/07 Tue I am curious how to tell if my heads are 23 degree or 18 degree. I bought an engine from racingjunk and I was told the heads were 23 degree but a buddy says they are 18 degree. The problem is that all numbers were ground off except for a few hand stenciled in the front that Brodix say mean nothing to them. [ Next Thread | Previous Thread | Next Message | Previous Message ]

Replies:

Subject Author Date anybody????? (NT) JS 20:33:36 11/21/07 Wed I think you can tell by looking at the intake port position. If I'm not mistaken, most all 18 degree heads the intake ports are evenly seperated and not siamesed like the 23 degree heads. I do believe Dart now makes an 18* headed siamese head though. (NT) -- .., 05:13:19 11/22/07 Thu My bad. i thought he had a big block. Small block is hard to tell without knowing what to look for. (NT) -- .., 08:47:00 11/24/07 Sat You will have to really know what you are looking at, but intake and exhaust ports are raised. Ports all have the same configuration just raised. Or just measure with a protractor at the valve stem. There are some raised runner 23 degree heads out there, so look really close. (NT) Gravy 19:20:36 11/22/07 Thu Is there any way to tell without tearing it down? The engine is fresh right now and ready to go into my S-10 for testing. (NT) -- JS, 06:44:57 11/23/07 Fri Like I said, you have to know what your looking at. Hard to just tell with out showing. If you have another SBC head around look at the port hieght compared to the deck. An 18 degree will be higher off the deck. Does it have an shaft rocker system ? Also a good indicator. (NT) Gravy 19:21:46 11/23/07 Fri Yes it has a shaft rocker assembly. (NT) -- JS, 09:16:08 11/25/07 Sun Check for off-set lifters and rockers. 18 Degree all use them, but some 23 do also. Measure the off-set on both, this will give you an idea of valve placement. Do you know the brand? Brodix, G.M., Dart ? Going to have to be a detective here and track it down. (NT) -- Gravy, 11:03:11 11/25/07 Sun I was told that they are 23 degree Brodix but you have to assume that if he is wrong about the 23 degree part then he could be wrong with the brand as well. What should I measure as far as valve angle and offset? (NT) -- JS, 14:14:55 11/25/07 Sun Valve angle is from the deck to angle of the valve stem. offset will be how far over the push rod is from the center of the rocker. Also check how far up the top of the port is compared to the intake bolt hole. (NT) -- Gravy, 08:31:52 11/29/07 Thu