How will Edelbrock Performer RPM heads affect my Compression Ratio?

stangman67 said:

I did this on my 67 289 two summers ago. I bolted them on part#60229? RPM with 1.90" intake valves, and honestly, it made no difference. I had the RPM cam and crane rr, all the stuff, before the heads, and it ran not much better. NOT worth the $1800 total cost of the job. So thinking the compression was the problem, i rebuilt my engine last summer with forged huge dome pistons, balanced bottom end and the heads again. The pistons ended up hitting the heads during fitment, so the machine shop had to do alittle milling on them. I indexed the spark plugs, dropped it in, and it runs pretty good. At the strip i got a 13.8 for my first time ever, and im hopping to fix traction issues and drop the times. I would really recommend building a 351 with just some iron heads, i know it will feel faster on the street because my car has a loss of torque, but it runs good at 6500. If I could do it agian, this is what i would do, becuase it runs like a race engine, not a street engine.

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