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goinbroke2 · 10-25-2017, 06:55 AM

Wow Dave, that's abnormal for a sbf. I'm assuming you were using 69-70 351W heads? I had a 2 4bbl 302 I built which liked 38* which seemed a lot, when I pulled it apart the pistons were washed clean around the circumference of the piston and the centre was black. I chalked it up to something I did wrong while porting and chamber work and that was why I needed 38. 40 though, that to me seems pretty high.

Course they all ain't the same are they? Lol!

10-25-2017, 06:55 AM	#6
goinbroke2 Senior Member Join Date: Mar 2002 Location: NS CANADA Posts: 895 Likes: 1,663 Liked 395 Times in 154 Posts	Re: '67 El Camino H/SA Wow Dave, that's abnormal for a sbf. I'm assuming you were using 69-70 351W heads? I had a 2 4bbl 302 I built which liked 38* which seemed a lot, when I pulled it apart the pistons were washed clean around the circumference of the piston and the centre was black. I chalked it up to something I did wrong while porting and chamber work and that was why I needed 38. 40 though, that to me seems pretty high. Course they all ain't the same are they? Lol!