I’m restoring a 69 Z28 old school style to near stock. 4:11’s, 4 speed. I’d like the solid lifter sound and run on pump gas.
I’ve read hours of 11:1 CR on 93 octane pump gas threads. I came to the conclusion an 11:1 engine with a 30-30 cam may or may not be happy with 93 octane. I’m hoping to have an engine that doesn’t need reduced timing or need timing creativity. I don’t really want to run a bigger duration cam than a 30-30.
I’m going to put the original 302 on a shelf. I have an old school LT1 pink rod 11:1 short block that will be used. It’s stock bore never been apart super low mileage short block. If I do use the original 64CC 302 heads and a 30-30 or LT1 cam, I might consider shaving the tops of the pistons.
Question: What amount of shaving should/could be done to the top of the piston domes?
Just a guess, but flat tops might not have enough compression. And it might be difficult to find flat tops with full floating pins.
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Or maybe this is a better way to go about it:
I’ve been reading that aluminum heads allow a higher compression ratio to be used. I guess another option would be to use aluminum heads. Trick Flow has a DH series head that has a nostalgic appearance with double hump castings (and bolt holes for the 69) They only come with 60cc chambers.
As far as pinging is concerned, does anyone have input on how the 60cc chamber aluminum heads might work on my application? Or might compare to 64CC stock heads? I’d like to maintain a stock engine appearance.
I’ve read hours of 11:1 CR on 93 octane pump gas threads. I came to the conclusion an 11:1 engine with a 30-30 cam may or may not be happy with 93 octane. I’m hoping to have an engine that doesn’t need reduced timing or need timing creativity. I don’t really want to run a bigger duration cam than a 30-30.
I’m going to put the original 302 on a shelf. I have an old school LT1 pink rod 11:1 short block that will be used. It’s stock bore never been apart super low mileage short block. If I do use the original 64CC 302 heads and a 30-30 or LT1 cam, I might consider shaving the tops of the pistons.
Question: What amount of shaving should/could be done to the top of the piston domes?
Just a guess, but flat tops might not have enough compression. And it might be difficult to find flat tops with full floating pins.
-----------------------------------
Or maybe this is a better way to go about it:
I’ve been reading that aluminum heads allow a higher compression ratio to be used. I guess another option would be to use aluminum heads. Trick Flow has a DH series head that has a nostalgic appearance with double hump castings (and bolt holes for the 69) They only come with 60cc chambers.
As far as pinging is concerned, does anyone have input on how the 60cc chamber aluminum heads might work on my application? Or might compare to 64CC stock heads? I’d like to maintain a stock engine appearance.