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Old 07-26-2021, 05:04 PM   #1
Sparky dave
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Factory Gen 6 block with gen 5 heads?

Scored a 1996 gen 6 454 but disappointed to find gen 5 heads and hydraulic flat tappet cam in it. Don't see how this engine has ever been messed with as I know if came straight out of a motorhome. Had anyone else had similar experience?
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Old 07-26-2021, 11:18 PM   #2
Ziegelsteinfaust
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Re: Factory Gen 6 block with gen 5 heads?

It could be one of those crossover year issues that occasionally pop up. In your case is that motorhomes have a different smog standard then a pick up, and thusly a different engine. It may have been a TBI engine with a port injection block.

So you somehow got a rare factory hybrid.
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Old 07-27-2021, 04:57 PM   #3
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Re: Factory Gen 6 block with gen 5 heads?

Quote:
Originally Posted by Ziegelsteinfaust View Post
It could be one of those crossover year issues that occasionally pop up. In your case is that motorhomes have a different smog standard then a pick up, and thusly a different engine. It may have been a TBI engine with a port injection block.

So you somehow got a rare factory hybrid.
I don't know if I feel real lucky or unlucky now. Thanks for reply you've thought the same as me. At least it's half a gen 6 I'll look for some heads down the line 👍
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Old 07-28-2021, 12:15 PM   #4
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Re: Factory Gen 6 block with gen 5 heads?

I didn't know the gen 5 vs 6 heads were any different. Is there something that changed with the gen 6 to accommodate the roller lifters?
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Old 07-28-2021, 12:57 PM   #5
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Re: Factory Gen 6 block with gen 5 heads?

They went from peanut ports to a smaller oval. Along with it came a revised chamber design.

The only downside to the gen6 heads are the lack of carb intakes. Supposedly they work really well for a street engine otherwise with a good cam.
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Old 07-29-2021, 08:38 PM   #6
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Re: Factory Gen 6 block with gen 5 heads?

Motor homes are all about torque, they probably used peanuts for that reason. As for the flat tappet....no idea.
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