Hey all! Trying to get a better idea what my engine components are. I have a build sheet that says there were 1.45 valves installed. My car is a 74 factory V8 car. What I’m seeing the stoxk 74 heads with 1.45 valves, they would have been a 58 cc chamber. thing is, the casting numbers on the block are D10e, ( Torino??) and the exhaust manifolds also have D1 numbers. I know the engine was gone thru, maybe the machine shop gave a core charge for the 74 block, had a 71 ready to go, and serviced the 74 heads. if I’m reading correctly, that would give me a block with a deck clearance of .016, and chambers smaller than the 71. Which could get me in the mid 9’s compression wise. Pistons have a 4 cc dish. I can’t find the thickness of the head gaskets, but it was an F302-4 gasket set, which looks To be stock-ish gasket set. does that sound right to anyone?
Every 302 I've seen in early/mid '70s have a Torino identifier. My '72 was D2OE. According to '71 & '74 shop manuals, head cc is 56.7-59.7 for both years. Deck height was increased '73-ish to lower compression. 1.45 is referring to exhaust valve size, intakes are 1.78. Both same in every std 302.
I had a D1 block and the pistons were original and .040 down the hole. If your engine has been gone through, it seems like the average engine builder used pistons with a 1.85 pin height instead of 2.15? That puts them down an extra .030. I dont think you can know what is actually there unless you tear it down. If you just want to drive it and it runs good, no problem. If you want performance, compression is a big deal in my opinion. If you dont want to tear down the engine, the best performance booster is a lower rear end gear, but even that expense should be weighed carefully in light of future use of the car. There are tuning things you can do to help low compression a little bit.
