MG Sports Cars

engine swaps and other performance upgrades, plus "factory" and Costello V8s

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BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5657 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

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Re: For a 302 conversion - pro/con of headers out the wheel well?
Posted by: BlownMGB-V8
Date: January 20, 2016 02:32PM

Oh well.

If the only reason you put headers on an engine is because they look better than iron manifolds, or because that's all there is available, then sure. Your point makes perfect sense.

Usually though there is a goal like improved mileage, broader torque range, and a noticeable power increase that applies pretty much across the board. If that is the case it usually helps to know what you are buying, though in our case not so much.

Honestly, I am sorry that short headers like we are almost universally forced to use in these cars have these shortcomings. And it's nice that we can at least mostly overcome the power issue by adding displacement.

I'd love to be able to say that it just doesn't matter. But really, it does.

BTW, we're really enjoying the latest arctic clipper y'all sent down our way. I get to take the snow blower on its maiden run soon as the battery is charged enough to start. Hoo-Ra.

Jim


Dan B
Dan Blackwood
South Charleston, WV
(952 posts)

Registered:
11/06/2007 01:55PM

Main British Car:
1966 TR4A, 1980 TR7 Multiport EFI MegaSquirt on the TR4A. Lexus V8 pl

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Re: For a 302 conversion - pro/con of headers out the wheel well?
Posted by: Dan B
Date: January 20, 2016 03:17PM

Hey guys!
I really enjoyed reading this thread. Almost like standing around in the parking lot at a V8 meet! Somebody get me a beer.....


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5657 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: For a 302 conversion - pro/con of headers out the wheel well?
Posted by: BlownMGB-V8
Date: January 20, 2016 04:55PM

Ptffft!!!

Think I'm gonna need a cab.

Jim


MGBV8
Carl Floyd
Kingsport, TN
(3509 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
79 MGB, Buick 215

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Re: For a 302 conversion - pro/con of headers out the wheel well?
Posted by: MGBV8
Date: January 20, 2016 07:19PM

On your snowblower? Of course you are, and a heater!


perrymgbv8
Perry Stephenson

(166 posts)

Registered:
12/06/2007 02:50PM

Main British Car:


Re: For a 302 conversion - pro/con of headers out the wheel well?
Posted by: perrymgbv8
Date: January 30, 2016 05:55PM

I found that the blockhugggers were ok for my original Rover 215 engine. Having said that the engine revved quicker when I dropped the exhaust and crossover section to leave both pipes blowing down either side of the engine at the track. Then i fitted the 4.6 litre engine with stainless steel RV8 style headers that came out of the inner wings. I did cut these back in the collector so I could fit 3" pipes either side and then fitted some shop bought bends to give me a 3" pipe either side which came out just behind the front wheels. This worked very well for my nitrous motor. Then I added a 4/72 blower and dropped the nitrous from a 275 shot down to a 175 shot for charge cooling + a bit of extra power. This also worked well but in the end I made a set of Zoomies for the engine and have stuck with those ever since as I re worked that engine out to 4.9 litres / 299ci.
My car is of course a teack only car as it does not see road use these days. I'
I am only intetested in 1/4 mile these days.
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