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Thread: Chevy HT502 Big Block Intake Manifold

  1. #1

    Default Chevy HT502 Big Block Intake Manifold

    I have a new Chevy HT502 big block crate engine that I've put in my '86 Chevy Dually. I originally bought a GM performance 19131359 manifold for the engine, and I have it currently installed and it runs like crap. I have Holley Sniper fuel injection and I have had it professionally tuned with the MSD distributor and 6AL ignition box and it still runs like crap. I believe my problem is this intake manifold. It's the manifold that comes on a HO502 engine from the factory. However, the HO502 has very large rectangle ports, its cylinder heads are part number 12562925, but my HT502 (HT stands for heavy truck) engine uses smaller round intake ports part number 12562917 cylinder heads. My best guess these are what's referred to as peanut port heads. But due to the fact this engine was never installed on a production vehicle, I have found it very hard to find what intake manifold will fit. The max RPM of the engine is 5200. I like something that idles well. Like I said earlier I have the Holley Sniper fuel injection installed so I need a square bore flange. I called and talked to Summit Racing and they suggested a Weiand 8019 intake manifold, but I wanted to check with you before I made any purchase. Thank you.
    Kenny Sorrels
    405 328 0881
    kfactor239@yahoo.com
    Feel free to call text or email me anytime.

  2. #2
    Join Date
    Dec 2009
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    Connecticut
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    Default

    Quote Originally Posted by kfactor239 View Post
    It's the manifold that comes on a HO502 engine from the factory. However, the HO502 has very large rectangle ports, its cylinder heads are part number 12562925, but my HT502 (HT stands for heavy truck) engine uses smaller round intake ports part number 12562917 cylinder heads.
    The Weiand 8019 BBC intake manifold has oval ports. The Weiand 8018 BBC intake manifold has rectangular ports. Before purchasing an expensive intake manifold, buy the appropriate intake gasket to ensure it fits your cylinder heads. (Fel-Pro 1212 for oval port heads or Fel-Pro 1275 for rectangular ports.)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

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