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Dwight Southerland · 08-29-2023, 10:16 AM

Ah, yes! I remember now!

Depending on the flow characteristics comparison of your 401s and 990s, the 454-425/424 may be a better choice. In my recommendation, I was assuming you only had the 401s available and did not want to spend the money on another set of heads.

08-29-2023, 10:16 AM	#8
Dwight Southerland VIP Member Join Date: Dec 2001 Location: Arkansas - In the middle of everything. Posts: 2,001 Likes: 64 Liked 780 Times in 194 Posts	Re: SS/GT Engine Choice Ah, yes! I remember now! Depending on the flow characteristics comparison of your 401s and 990s, the 454-425/424 may be a better choice. In my recommendation, I was assuming you only had the 401s available and did not want to spend the money on another set of heads. __________________ Last edited by Dwight Southerland; 08-29-2023 at 10:18 AM.