Round Port Head

Round Port Head

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  1. RM-4 Round Port Ram Air/HO/SD Style Factory Headers

    RM-4 Round Port Ram Air/HO/SD Style Factory Headers

    Pair, (LH and RH) Ram Air Round Port Manifolds (shown at right with gray ceramic coating)

    Fits 68-79 GM A-body; 70 1/2-81 F-Body; 69-77 G-Body, 69-81 B-Body with these heads: RA II, RA IV, 455 HO, 455 SD, Edelbrock heads.

    Manifolds are 455SD design (the largest Round Port design).

    Original casting numbers on Manifolds: LH 490803, RH 490802 Exact Reproductions from GM blueprints.

    RAIV pns now available by request!

    LH requires 2 bolt flange, RH requires 3 bolt flange; Collector size is 2.2"

    GET $25.00 OFF WHEN YOU ORDER OUR X-CROSSOVER EXHAUST SYSTEM WITH OUR FACTORY HEADERS!

    OPTIONAL CERAMIC COATING:
    Castings are port matched to Pontiac Blueprint then thermal barrier ceramic coating is applied on interior and exterior. Choice of Silver or Gray. 3-year Guarantee. Will not burn off, fade or peel. Reduces header temperature 40%! Silver is chrome-like. Gray looks stock.

    Learn More

  2. RM-4-OS Round Port Ram Air/HO/SD Style Factory Headers - Oversized

    RM-4-OS Round Port Ram Air/HO/SD Style Factory Headers - Oversized

    $439.00

    Pair, (LH and RH) Ram Air Round Port Manifolds with Larger Collector (shown at right with gray ceramic coating)

    Fits 68-79 GM A-body; 70 1/2-81 F-Body; 69-77 G-Body, 69-81 B-Body with these heads: RA II, RA IV, 455 HO, 455 SD, Edelbrock heads. Collector size is 2.45" for cars with "large pipe" exhaust systems and/or intake/head mods. The larger collector gives 14-16% more flow capability than stock collector castings. Lifetime warrantee on material and workmanship!

    Manifolds are 455SD design (the largest Round Port design). Original casting numbers on Manifolds: LH 490803, RH 490802 Exact Reproductions from GM blueprints.

    RA IV casting numbers now available upon Request!

    LH requires 2 bolt flange, RH requires 3 bolt flange (sold sererately)

    GET $25.00 OFF WHEN YOU ORDER OUR X-CROSSOVER EXHAUST SYSTEM WITH OUR FACTORY HEADERS!

    OPTIONAL CERAMIC COATING:
    Castings are port matched to Pontiac Blueprint then thermal barrier ceramic coating is applied on interior and exterior. Choice of Silver or Gray. 3-year Guarantee. Will not burn off, fade or peel. Reduces header temperature 40%! Silver is chrome-like. Gray looks stock.

    Learn More

  3. RM-4-OSA Round Port Ram Air/HO/SD Style Factory Headers - Oversized

    RM-4-OSA Round Port Ram Air/HO/SD Style Factory Headers - Oversized

    $449.00

    Pair, New for all 64-67 GTO, LM & Tempests using round port or Edlebrock heads.  These require one 2-bolt and one 3-bolt flange (sold seperately).    2.45" collector for more flow.

    These are our famous RM-4-OS modified to fit in 66-67 Abody. In the 64-65 Abody you may need to do some minor grinding on rear of underengine xmember to achieve good fit. Many 64-65 customers have also attained excellent fit by relocating engine .250-.500" to rear.

    GET $25.00 OFF WHEN YOU ORDER OUR X-CROSSOVER EXHAUST SYSTEM WITH OUR FACTORY HEADERS!

    OPTIONAL CERAMIC COATING:
    Castings are port matched to Pontiac Blueprint then thermal barrier ceramic coating is applied on interior and exterior. Choice of Silver or Gray. 3-year Guarantee. Will not burn off, fade or peel. Reduces header temperature 40%! Silver is chrome-like. Gray looks stock.

    Learn More

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