New in here need some advice SB 360 Cam selection

nm9stheham said
Hey good to hear from you! Glad the exhaust worked out; it wil lmake a very noticeable difference all through the RPM range.

Those indeed look like stock early 360 pistons.... dished tops with around 8 to 9 cc's of dish volume. The small notches are probably the orientation notches on the pistons.... they should be towards the front of the engine. The arcs you have drawn that look like eyebrows are probably light reflections from the cylinder walls.... they are too small for piston eyebrows. So this is a low compression engine, even with the heads milled 1 mm. Maybe 8.3 or 8.4:1.

Thanks for taking the compression readings. The compression readings are high for that engine, even with the heads milled that much. So I suspect this is more like a stock 2 bbl 360 cam. Or it is a 340 cam and is installed with quite few degrees of cam advance. Or the compression gauge is in error.

Hi thx alot for a fast reply, it is a 340 cam in it what i know, i have 15 hg in vacuum at idle at 800rpm and it runs really good at the higher rpms. The compression gauge was new!
I have installed new valvesprings to. (Pac racing) hughes engine 1110 was a bit of difference from the stock 360 that compressed with both hands:eek:

ok so that means that my camshaft selection is smaller more "Narrow" then if that compression was up a bit.

another question if would gain to change the heads to pro comp "rpm" knock offs
The Heads has has 64cc chambers with Howard springs, Competition Products 21-4N valves, flows intake :255,4 cfm at .500 lift Exhaust: 194cfm at .500 lift
They ar controlled and installed of Swedish Company called PPM Racing
The valveseats are done by them to.

or is a piston change better for more compression and perhaps cam?

or screw all the above and buy 3,91 gear in my 8 1 / 4 SG and just drive it :D

Take Care.