Senior Tech Team
Join Date: Feb 2005
Location: Long Island, N.Y.
Re: 781 porting
On this platform, the OEM CI "oval's", I would use some 2.125" or 2.150" x 5.250" SBC intake valves and some 1.810" x 5.370" Mopar exhaust's. We use this setup all the time on the 100% stock-appearing builds.
If you use theses sizes AND do a decent port job the heads WILL deliver.
Have 3 sets being done this week, most get Ferrea's valves. Fairly straight-forward operation. Occasionally we'll use Manley's intakes also.
(Add) With respect to porting on the exhaust's, I would stay away from the bottoms of those guides, this is a "high-stressed" area where the guides are pressed in and very close to water!! Just a tip.
Thanks, Gary in N.Y.
P.S. The lengths work well and all have SBC .343" stem diameters.
Sept. 2019 Drag-Week Winner - N.Y. Legal Streeter - 1956 Chevy Bel-Air 7.23 @ 196+ @ 3800#
Best time to date-11/2019 7.00 @ 204+ @ 3800#
Last edited by GOSFAST; Feb 3rd, 16 at 4:20 PM.
Reason: Add info