Aftermarket blocks in SSers

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.

Jeff Lee · 03-13-2013, 05:57 PM

25-35 HP for a Pontiac, all else being equal in preparation.

Hudlow66 · 03-13-2013, 09:37 PM

That's probably a good number, Jeff. Im always a little on the conservitive side when it comes to HP numbers. From a stock Pontiac block to the aftermarket blocks (Im guessing it's either the IA from Butler or the MR-1 Kauffman), you should gane a ton of stability in the cylinders. Let alone the solid valley...!

Phillip marvetz · 03-14-2013, 02:38 AM

What if any is the difference in weight?

Lynn A McCarty · 03-14-2013, 02:12 PM

Quote:

Originally Posted by Phillip marvetz

What if any is the difference in weight?

Dont know exactly, but I have been told like 70lbs heavier. Since there is more meat in the sleeves then we dont have to fill the blocks or install the braces on the lifter bores. I fill the entire area with epoxy after installing the brace to keep the block from moving around. I will see how much more net weight. Pontiac 455s benefit with weight on the front anyways to keep the wheels down.

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.

03-13-2013, 05:57 PM	#2
Jeff Lee VIP Member Join Date: Jul 2007 Location: Anthem, Arizona Posts: 2,766 Likes: 0 Liked 3 Times in 3 Posts	Re: Aftermarket blocks in SSers 25-35 HP for a Pontiac, all else being equal in preparation. __________________ Jeff Lee 7494 D/S '70 AMX

03-13-2013, 09:37 PM	#3
Hudlow66 Junior Member Join Date: Apr 2011 Location: Spokane Valley, WA Posts: 59 Likes: 0 Liked 1 Time in 1 Post	Re: Aftermarket blocks in SSers That's probably a good number, Jeff. Im always a little on the conservitive side when it comes to HP numbers. From a stock Pontiac block to the aftermarket blocks (Im guessing it's either the IA from Butler or the MR-1 Kauffman), you should gane a ton of stability in the cylinders. Let alone the solid valley...! __________________ Phil Hudlow 6678 (S/C, S/G, ET-PRO)

03-14-2013, 02:38 AM	#4
Phillip marvetz Senior Member Join Date: Oct 2008 Location: Lynden ,WA Posts: 820 Likes: 0 Liked 3 Times in 3 Posts	Re: Aftermarket blocks in SSers What if any is the difference in weight? __________________ 2009 V/SA Record Holder