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Lynn A McCarty · 03-13-2013, 04:20 PM

Well, until now we have run stock Pontiac blocks. After about 10 years of pursuit NHRA finally allowed us to use the aftermarket block a couple of years ago. I just ordered mine. We have extensive dyno work with the 455SD and the stock blocks.

I remember a huge discussion(mostly denial) about how aftermarket blocks make power. Yes if you do everything the same, it probably makes the same power. Yes, I still have to run the cast iron heads. I cant cut the deck much due to the 4.210 stroke and 6.625 rod.

Anyone want to make a guess on how much power this is worth? We are going to find out for sure.

03-13-2013, 04:20 PM	#1
Lynn A McCarty Member Join Date: Jun 2002 Location: Plainfield (INDY) Indiana Posts: 468 Likes: 1 Liked 3 Times in 3 Posts	Aftermarket blocks in SSers Well, until now we have run stock Pontiac blocks. After about 10 years of pursuit NHRA finally allowed us to use the aftermarket block a couple of years ago. I just ordered mine. We have extensive dyno work with the 455SD and the stock blocks. I remember a huge discussion(mostly denial) about how aftermarket blocks make power. Yes if you do everything the same, it probably makes the same power. Yes, I still have to run the cast iron heads. I cant cut the deck much due to the 4.210 stroke and 6.625 rod. Anyone want to make a guess on how much power this is worth? We are going to find out for sure. __________________ Lynn A McCarty 3470 SS Last edited by Lynn A McCarty; 03-13-2013 at 04:22 PM.