I've searched and searched but found conflicting information regarding the specs for the hi-compression 1970 350-4. If anyone has accurate information as to the head casting numbers, intake casting number, and crank casting numbers, please let me know. Citing your source would be nice too please. I also understand the hi-compression version in 1970 had aluminium rockers? Is this so? Thanks.
It was always my understanding that all the 350-2 and 350-4 had the same head castings, along with everything else. the difference was in the pistons. There was a pic of the hi vs low compression stock pistons on here a long time ago. I'll see if I can locate it.
The aluminum rockers were used in more than just the '70 hi-comp engine. I don't know what years, but my '71 has them.
I cant cite resources, but over the past 6 or 7 years of owning one of these engines i can tell you a few things that might help. Head casting #s were the same for all 70s and were not changed for the high comp. SP code engine. Base engine was SO code. Aluminum rocker arms were used on all 70 350s, and were changed somewhere around 71 to 72 to the stamped steel design due to wear issues with the aluminum. The aluminum rockers had slightly higher ratio than the stamped steel ones that replaced them, but this was not anything unique to the SP code engines. The carburetor should be 7040244 on an automatic car, i think the last # is changed for a manual trans. to 2 or 3 or something similar. This is the automatic #s. Intake manifolds are the same as all 4 bbl manifolds in 70, no change. Distributor has different #s supposedly. This is an area i dont know much about, but someone once told me it was a unique dist. for the SP code engines, and another guy told me that it even had stage 1 parts in it, or similarities. I cant verify any of that, but multiple people told me the SP code 350 distributor had special #s. Pistons were changed to acheive a higher compression ratio than standard, yet still used a dished piston i believe. Crankshaft would be the same as other 350s as well. I dont know the camshaft specs but the GSCA would know the profile and wether or not it is different than other 350s. They had an article in the GSXtra where they stated that they took the 350-315hp cam profile and added 14% more lift and 7% duration or something and gained about 15hp. Hope that helps
All 350 4 bbl distributors came with the same number, according to Preliminary Parts Cataloue No. X704 A dated Sept. 69.
Not so!!! Here is a picture out of a 70 chassis service manual..shows 2 different #'s on Dist for the 350-4 barrell...1111986 for lo-comp and 11112006 for the hi-comp...::grin:
Master Parts Catalouge shows 1111986 as only 2 BC dist. Group # 2.361 Distrubutor, Ignition 1111986 70 350 V8 - 2 BC. ????
350 dist's I have a original 1970 GS 350 and my Dist # is 1112006:laugh: and like the 1970 service manual says there are 2 different #'s for the 70 350 motor dist'so No: ...and I think that they know what came with what:TU: ...
I think my '70 chassis manual also shows a 1969 stage1 distributor part number (I forgot the actual part number) for a 1970 part (which should be 1112016). I believe the chassis manuals were made before the car was actually manufactured - this may explain some differences between the part listed in the book and the actual part used on the car.
Wow, it seems the documention on the 455 is complete and straight, but the 350 got shuffled around. Thanks to everyone so far for your help. I really appreciate it!
Found this info on the NHRA Engine Blueprint Specs section of their website: They've got carb, manifold, and head part numbers, and it looks like they recognize a different cam for the 315hp 350, but don't have a part number, rats! (Tried to copy it here, but it doesn't line up very well...hard to read.)
