These are the famous Round Port Ram Air style manifolds modified to fit in the 66-67 A- body. In the 64-65 A- body you may need to do some minor grinding on rear of under engine x-member to achieve good fit. Many 64-65 customers have also attained excellent fit by relocating engine back .250-.500 to rear. These have a large collector of 2.45" for cars with " large pipe' exhaust systems and/or intake/head modifications. These are for round port or edlebrock heads. The larger collestor gives 14-16% more flow capability than stock collector castings.These require one 3-bolt flange # PLF-OS-1-2.50" exhaust and one 2-bolt flange # PFL-OS-2-2.50" exhaust. Also the hardware installtion kit # PH-2 and the round port exhaust manifold gaskets on the page @ $29.00 set. Castings are much higher quality than you receice from the catalog suppliers. Castings have correct port detail, ports are cnc'd and interior of castings are detailed ready to run. Flange confiquration is crisp and correct. Castings from catlog suppliers have terrible port detail and weigh 30% more. Lifetime Guarantee on materials and workmanship. Optional Cermatic coating is avaiable at additional cost, manifolds shown in photo's are bare cast. Both castings are port-matched to Pontiac blueprint then thermal barrier coating is applied and cured on interior and exterior. Choice of silver or Gray. 3-year Guarantee. Will not burn off, fade or peel. Reduces header temperture 40%. Silver is chrome like. Gray looks stock.
- These are MADE IN USA. The majority of these manifolds on the market are made in China.