confused on swapology

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shawnxj
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Location: portland, tx

confused on swapology

Post by shawnxj »

ok i've heard some 4.0 heads won't work on some 4.0 blocks and some intakes and exhaust manifolds won't mate up right to fit on any other head then the 1 they came with. somebody school me please cause all i can find is heresay. so basically i just made a deal on a renix block but want to know what heads will fit on it and what intakes and exhausts will fit on that head
yuppiexj
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Re: confused on swapology

Post by yuppiexj »

All 4.0 heads will bolt to all 4.0 blocks.

Renix heads need Renix intake and exhaust manifolds. (the HO exhaust will physically bolt to a renix head but the lack of EGR is a big stumbling block).
The HO heads can have any year HO intakes (get the 99+ model it's gooder) The exhaust ports in the later years are smaller (higher velocity, faster Cat light-off, better torque) they need to match.

The Renix blocks are allegedly stronger due to higher nickel content.

I'd use a Renix block (they are cheaper to get usually free),7120 head (decent flow out of the box), and 1999+ intake manifold (broadens torque curve).
TurboTom wrote:i will eat my words later if need be.
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shawnxj
I love this board
I love this board
Posts: 413
Joined: March 30th, 2009, 7:30 pm
Vehicle Year: 1988
Vehicle Make: jeep
Vehicle Model: cherokee
Location: portland, tx

Re: confused on swapology

Post by shawnxj »

thanks for the info
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