FE Power Forums
FE Power Forums => FE Technical Forum => Topic started by: AmerigoHauler on August 18, 2017, 07:35:29 PM
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I have a couple of questions about the compression ratio of my FE. It is an “A” scratch 428 from a ’67 T-Bird. It was rebuilt sometime before I bought the truck it is in. The pistons are marked L2245 and are .030” over. (Photos below, I hope)
My 1st question is can anyone tell me who made these (TRW?) and also what the dish volume would actually be?
My other question is regarding the heads. I am running a set of out of the box Edelbrock #60065 heads. They claim 72 cc’s but I seem to recall reading somewhere that they run a little larger.
This engine has been back together and running fine for 14000 miles now. I plan on asking more questions about this engine but I wanted to be able to give a good answer regarding the compression ratio if it comes up. Using various online calculators and guessing on the piston dish I'm coming up with between a 9.6 and 10.2 ratio.
If someone wants to give me their calculation on this the other specs are:
Bore=4.16"
Stroke=3.98
Piston in the hole=.017"
Head gasket compressed=.038"
Head gasket bore=4.400" or volume=9.90cc's (Edelbrock 7337 head gasket)
Thanks, Erich
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according to my catalog 9.9-10.4. 68cc-74. they r indeed trw. my old catalog does not list dish volume. i would say your are close in your calculations.
jim
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Thanks for that info Jim. I was surprised when I couldn't find any solid info on line. Helps me remember why I keep some of my old books and catalogs.
Thanks again, Erich