Originally Posted By Pockets
A few 493 we have put together have not had issues using the 1009 gaskets. Is there a known issue we haven’t experienced yet?

I am kind of wondering the deal here ?
The 1009 is listed as 4.410 bore . Unless you have a big champher at top of bore what issue can you have ?
I have used 4.410 bore cometics in my 440 and 505 , 440 was at 0.055 over
I have fitted 1009 with my Trickflows , and trickflow recommend this gasket . Trickflow also say their head will not fit under a 4.320 bore

Tex

New best ET 10.259@129.65 .
New best MPH 130.32
Finally fitted a solid cam,
stepped it up a bit more
3690lbs through the mufflers
New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm
Power by Tex's Automotive