396 325 combo

Grant Eldridge · 08-13-2012, 10:38 PM

According to the NHRA blueprint specs, the '290 small plug heads have a few more more cc's in the ports. Perhaps the small tapered seat plug is located slightly more efficiently in the chamber? I've used the '063, the '215 and now the '290 but never done a back to back test to directly compare. I've never seen or heard of any '280 castings anywhere except in the NHRA guide, do they actually exist?? Let's hear from someone who knows these head castings, I'd also like to learn which are considered the best to use.....

08-13-2012, 10:38 PM	#3
Grant Eldridge Member Join Date: Jul 2007 Posts: 124 Likes: 0 Liked 0 Times in 0 Posts	Re: 396 325 combo According to the NHRA blueprint specs, the '290 small plug heads have a few more more cc's in the ports. Perhaps the small tapered seat plug is located slightly more efficiently in the chamber? I've used the '063, the '215 and now the '290 but never done a back to back test to directly compare. I've never seen or heard of any '280 castings anywhere except in the NHRA guide, do they actually exist?? Let's hear from someone who knows these head castings, I'd also like to learn which are considered the best to use.....

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