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Author Topic: Any 454 experts?  (Read 2229 times)

Offline Orlando87Chevy

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Any 454 experts?
« on: August 02, 2012, 06:16:40 pm »
I thought I got lucky today. I bought myself a 454 in excellent condition today for $500. What a steal. When I checked the casting numbers it came up a 1991 454 with a Gen 5 block. I heard that you can't swap the Gen 4 heads to the Gen 5. Is this correct?
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Offline nvrenuf

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Re: Any 454 experts?
« Reply #1 on: August 02, 2012, 06:48:04 pm »
You can use Mark IV heads on a V block but you have to use special head gaskets, voodoo and be very careful. It's not a bad motor, you just need to read up on it and learn about the differences.

Does the block use a 1 pc or 2 pc rear main? 2 pc is Mark IV, 1 pc is Mark V or VI.

Btw, Mark V = no mechanical fuel pump boss, electric only.
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John

'91 K5 454, 4spd, Dblr, J76, 70HD, 5.86's & 43's
'06 Dodge MegaCab
'06 Jeep Rubicon Unlimited

Offline Orlando87Chevy

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Any 454 experts?
« Reply #2 on: August 02, 2012, 07:56:43 pm »
I looked up the casting number and it was an 1991 4 bolt main. Who makes the special gasket?
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Offline nvrenuf

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Re: Any 454 experts?
« Reply #3 on: August 02, 2012, 09:36:10 pm »
A quick Google search yielded this, check out post #4 -

http://www.chevelles.com/forums/showthread.php?t=19073
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John

'91 K5 454, 4spd, Dblr, J76, 70HD, 5.86's & 43's
'06 Dodge MegaCab
'06 Jeep Rubicon Unlimited
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