LS1/LS7 Hybrid?

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Oct 18, 2005 | 04:35 PM

TAEnvy

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From: DFW

LS1/LS7 Hybrid?

Okay guys quick question. Ive heard both yesses and nos. Will some SLP heads made for the LS1 fit onto the LS7 block?

Oct 18, 2005 | 04:42 PM

Greg Fell

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From: Morton IL

yes

but SLP heads on a big bore motor = a sinny sin sin

i doubt they flow what a 427 needs

Oct 30, 2005 | 02:32 PM

TAEnvy

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From: DFW

I was told on other forums they do not, so I contacted SLP, and I immediately got a reply that just said No, without any reasons why, then a week later, I recieved another reply thats aid they had not tried and were not sure. So do you guys think they will fit or not? Im not sure. Ive seen the SLP heads work very well on a few LS1 427 would and LS7 427 need more flow? I wouldnt think so with them being the same displacement.

Oct 30, 2005 | 02:42 PM

baldurann

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From: Kingwood, TX

I'd go with AFR225's, if you wouldn't want to go with stock LS7 castings.

Oct 30, 2005 | 02:58 PM

69firebird

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From: hurst tx

The heads should "fit" however id bet they are saying no due to the fact the bore is so much larger on the block than on the head.

alolt of guys dont like running things like that, the ls7 is a dumed down version of the C5R block, that one will work with stock heads so this one sure should as well

Oct 30, 2005 | 10:37 PM

TAEnvy

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From: DFW

Quote:

Originally Posted by baldurann

I'd go with AFR225's, if you wouldn't want to go with stock LS7 castings.

Thats what they are.

Oct 31, 2005 | 12:24 PM

Ferocity02

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I'd imagine they would fit. Since LS7 head will fit onto an LS1 block, should LS1 heads go onto an LS7 block? However, SLP heads will not be big enough for that many cubes.

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Oct 31, 2005 | 05:29 PM

warp 10

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This topic was addressed on another site devoted to the new gun (LS7).

Interchangability of heads between LS1, LS6, LS2, the truck motor (Lq6 I think) and the LS7.

The main issues discussed were:

1. bore sizes vs valve sizes vs valve spacing vs valve angles (11 vs 12)

2. intake port shapes vs manifold size and etc.

3. exhaust port shape (round vs D)

Yes there are some considerations when mixing and matching!