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Discussion Starter · #1 ·
So just for info, I thought I would share. They are GM 325cc rect port from a 454 ho. I had a competition cnc valve job and 2.25/1.88 valves installed. No other work done:

.100 78/53
.200 146/95
.300 200.5/140
.400 250.9/178
.500 299/206
.600 334/237
.700 359/248
 

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thanks for posting i had been looking for some numbers for some time for those 325cc heads, i have a set off a mercruiser i was going to install on my 454.

what are the casting numbers off your heads?

mine are '088
 

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cool on a side note any one know what stock 990's flow?
sound like the engine those go on should run great expecially with a Cstraub cam.
 

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Discussion Starter · #7 ·
cool on a side note any one know what stock 990's flow?
sound like the engine those go on should run great expecially with a Cstraub cam.

I cant wait. The heads are going back on my 454 except this time the 454 is a 13:1 468, Straub Solid roller, 79 camaro, 4.30 gear, th400 with brake, 28X10 slicks, etc.
 
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