421 cube pulling truck engine

General engine tech -- Drag Racing to Circle Track

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CGT
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Re: 421 cube pulling truck engine

Post by CGT » Sat Feb 10, 2018 9:04 am

sjre wrote:
Sat Feb 10, 2018 9:00 am
My guess would be 680 range.You and Randy have the ability to exceed the predictions.
You could be right, maybe I'm just prejudiced against the big chevy because I don't really like them a lot. :o

sjre
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Re: 421 cube pulling truck engine

Post by sjre » Sat Feb 10, 2018 9:20 am

CGT, I think you look at torque to predict hp but what if a big block made 700 ft lbs but only 640 hp.where to look ?

CGT
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Re: 421 cube pulling truck engine

Post by CGT » Sat Feb 10, 2018 9:37 am

sjre wrote:
Sat Feb 10, 2018 9:20 am
CGT, I think you look at torque to predict hp but what if a big block made 700 ft lbs but only 640 hp.where to look ?
Valve train :D

randy331
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Re: 421 cube pulling truck engine

Post by randy331 » Sat Feb 10, 2018 11:00 am

sjre wrote:
Sat Feb 10, 2018 9:20 am
I think you look at torque to predict hp but what if a big block made 700 ft lbs but only 640 hp.where to look ?
I can't see it making 700 LBs. That's almost 1.5 Lbs/cube. The 468 isn't the type of build to produce that kinda TQ. If it did and only made peak HP at 6000 rpm It'd make 720 HP. I'd say this is a 1.3 TQ/cube type of build, and will peak around 6500-6700 area. So I expect in the 675 HP area.

This guy has been around truck pulling a lot and the break for him to go up to the next higher gear is 700 HP.

Guess we'll see how good the head guy is?? :)

Randy

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