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> I just picked up a 280zx motor from the
> junkyard. It is a f54 block
> and a p79 head. It has 60k miles on it. My
> 73 240z has 165k miles
> on it and it is l24 with e88 head. I am
> definately using the new
> block in my car, but am trying to decide
> which head to use. I am
> going to still use the SU's and headers.

> If I use the p79 I am going to have to buy
> new headers for the round
> exhaust ports ($200). If I use the e88 it
> may need some
> reconditioning. I compression tested the l24
> and the fourth
> cylinder's low compression did not raise
> when I added some oil, so I
> assuming it has some kind of valve problem.
> I have also heard that
> if you are going to use SU's with a p79 you
> can't use the stock cam.
> It looks like it is going to at least cost
> $500-$600 to use the p79.
> It should be less to recondition the e-88.

> My question is before I start investing in
> one or the other which
> should I use?

> Thanks

Here's what I think. The P79 head has much better combustion chambers than the E88. However the E88 has better exhaust ports and will give you a higher compression ratio with the 280ZX block. If I am correct, that block has flat top pistons. You should have about 10.2 to 1 c/r with the E88 head. The p79 will be 8.8 I think, can't remember as there are so many combo's. I would decide on your compression ratio, then that will tell you what head to use. Personally, I would go with the E88 as I like a higher c/r. Makes for great throttle response.
 

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> Does anyone have an opinion os the N24 head
> someone knowledgable told me that this is a
> rally good head .

The n42 head is pretty good. It has the 44mm/36mm valves and fairly good ports and combustion chambers. I have a friend who had an L28 motor built with an N42 head. All he had was flat top pistons, and header. He used stock carbs, cam, valve train and no porting. His car did a [email protected] with a 4.62 rear end. Now that's a lot of gear, but his motor ran VERY well.
 
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