Slant 6 Split exhaust

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I've heard if you peen the weld with a pick hammer as soon as its laid, it helps relieve the cracking too. Interesting....
 
I've heard if you peen the weld with a pick hammer as soon as its laid, it helps relieve the cracking too. Interesting....

That is true but you use the ball end of a ball and peen hammer to do it.
 
Nickle rod is your friend on cast iron. Here's a set I made for a member he needed the heat riser tried me hardest to tap the third bolt, was a no go. this one won't have a functioning heat riser although it will still provide a lot of heat mounting it with no gasket on the bottom of an aluminum intake, will be welding it shut throwing it on eBay.

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One way to economize that makes sense is to buy a Dutra casting for the front 3, and use a stock manifold for the rear 3 exhaust ports, which retains the factory heat for quicker warmup times. You have to cut and cap the rear section of the manifold.
 
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