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Old 11-17-2015, 08:46 PM
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Mr Twister Mr Twister is offline
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Default Getting my new headers Tommorrow

I'm driving over to southerm Michigan to get my new Maddog headers!
They have 2 inch primaries and fit round ports, lets see what the dyno says for my mild roller 400. More to follow, be patient the builder is still doing the short block.

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  #2  
Old 11-25-2015, 07:36 PM
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Mr Twister Mr Twister is offline
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Yes, I got them! They look great.

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Old 11-29-2015, 11:14 PM
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candyman13 candyman13 is offline
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they should fit great maddog used my car to design them.

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Old 11-30-2015, 04:28 AM
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Any results you can share and any more details about the combo

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'71 Holden HQ Monaro - 3850lbs race weight, 400c/i - 11.4 @ 119
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Old 11-30-2015, 07:19 AM
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Mr Twister Mr Twister is offline
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The car is an 86 Grand Prix. The engine is a 400 Pontiac with forged rods and pistons, solid roller cam, 325 CFM SD Performance CNC ported E-heads and EFI. I put an 8.5 inch GN rear in it with an Eaton posi and 3.73 gears. I have a built TH400 that is still not installed, I have been driving around with a TH200R4 and the 231 engine, but the trans is worn out now so not much driving this last summer. I put 4 wheel discs on, better rear control arms, sway bars and springs. Next is to finish the engine and go to the next level on the suspension and get some modern tires and wheels. It sports 15" Weld Prostars right now.

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Old 11-30-2015, 07:22 AM
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Sounds awesome. Very close to my combo. I won't be able to get to the dyno or track for a bit due to my wife about to give birth to our first baby any day now, so am curious to hear how your setup goes when it's all together and sorted.

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'71 Holden HQ Monaro - 3850lbs race weight, 400c/i - 11.4 @ 119
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Old 12-27-2019, 05:28 PM
Kennybill Kennybill is offline
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