Hello All, i have a couple of questions.. i have a 68 GS 350 Cali 1 question is im going to do a rebuild the stock motor still runs but when it gets to the operating temperture it only gets around 5-8 psi..the question is this..im going to overbore it .030 a T/A 113 cam aftermarket intake port match and polish the heads using stock sized valves and a 100 shot or so of the silly juiceT/A headers with an H-Pipe..do you all think i should get a junk yard motor?I know the compression is diffrent and the HP rating as well..i want it to be a solid build but am not sure if i should risk the stock #`s matching block and heads?can i get the same power out of a smaller compression block? any suggestions..im pretty much a novice when it comes to rebuilding a motor..i was thinking on a kit from PAW anyone experience with them?
Unless it's a "Hi-Comp" motor it is the same motor in any buick as that year. It should say that on the air cleaner, if it does, then it's 10.25:1. If not then it's just a plain 9.2:1 or so compression. 71 (maybe 72) and later are 8.4:1. The difference in compression is in the pistons. If you're boring it anyway, you'll be putting new pistons in, so just get them for the compresion you want. Personally I'd go with the TA 212. as far as keeping the numbers matching motor... In my opinion, and it is only my opinion, I could be wrong, but I don't think it will matter much. It is a GS, but only a 350. If it was a 455(or 400 in those years) I'd worry bout keeping the value up. But the value of it probally doesn't change much if it's numbers matching or not, because it's not that desirable of a car. Like I said that's just my opinion, and I'm not an expert in that.
Thanks for the inpunt Nick..It is the high compression 350..i was considering a BB swap but decided against it..you like the 212 cam..food for thought..is it true that Buicks like big CFM carbs? Tim
I've always heard they like big CFM carbs, 750 is a good starting poing for a SB and 800 should be good for big block. They need more cfm's because the ports are smaller and the air velocity is higher then other brands engines. the samller ports also help increase the low rpm torque
