400/mustang
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Joined: Mar 2006
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Originally Posted by baddad457
The 331 I did has a cast steel Eagle crank. No problems. I spun it up to 6500-7000 regularly, almost daily. For a weekend warrior, I wouldn't even think about a forging. 
Mine had the Eagle crank Eagle SIR rods, and SRP forged pistons.
Mine had the Eagle crank Eagle SIR rods, and SRP forged pistons.331 vs. 393....Tough decision. I agree with you on the cast crank and that is the way I am going to go. I am not looking for over 500 HP so I think I can get away with it in the 302. Just need to do more reserach on the two...
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Joined: Jan 2006
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From: upstate N Y
Those 69/70 stangs with 429s were modified outside Ford for the Boss 429s to fit anyway.A company called Kar Kraft modified the shock towers to take the 429 motor.The 429/460 in 67/68 stangs have a complex header design that puts 2 tubes in front and 2 behind the crossmember on each side.
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Exactly. The Boss had semi-hemi heads that made the engine much wider than the std. 429/460 wedge. Kar Kraft mods were not limited to shock tower butchering. They also shortened the upper control arms, notched the frame, and moved over the brake master cylinder and steering box. I have a couple engine compartment pics in the File section of my Forum. It looks like a real hack job compared to the aftermarket tower notching kits available today.
The header description is the same as the Tubular Automotive swap headers I used in my '70 Mustang 25 years ago. If still available, I wouldn't recommend them. They were a poor fit, leaked badly, hung down too low, caused the starter to over heat and forced to remove the lower crossmember and weaken the chassis. I had to install a Shelby Xport brace, lower the power steering bracket, and use an offset adapter for the oil filter.
BTW, the Torino headers mentioned in the Ford Performance Handbook for the 67-70 Mustang 429/460 swap did not fit, BTDT & wasn't even close.
The header description is the same as the Tubular Automotive swap headers I used in my '70 Mustang 25 years ago. If still available, I wouldn't recommend them. They were a poor fit, leaked badly, hung down too low, caused the starter to over heat and forced to remove the lower crossmember and weaken the chassis. I had to install a Shelby Xport brace, lower the power steering bracket, and use an offset adapter for the oil filter.
BTW, the Torino headers mentioned in the Ford Performance Handbook for the 67-70 Mustang 429/460 swap did not fit, BTDT & wasn't even close.
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