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Topic Review (Newest First)
02-02-2004 09:58 PM
rifraf Ya know,they make a couple of electronic conversion kits for the smaller gm points distributer fairly cheap and they also make a non window cap with hei posts,they actually work pretty good,like trees said,the posts are closer,but there's no getting around that if you need a smaller diameter one. Thats usually only a problem with way hot coils anyway,or carbon tracking.
02-02-2004 07:48 PM
trees Jordan, to me the GM V 6 is like the measles - you only have them once!!! The 700R4 /4.6V6 will take the same space as a SB V 8 with short water pump. I have been there, never to go there again. No mater, you can get a late model GM HEI that is about the same dimensions as the old points distributor. Think it is in the 94 and up Cameros, Vettes and Firebirds. I could get more specific with research, but look in the parts store and they can give you the info. Then you just go to your Bud's yard and start looking. There is some thought that the smaller diameter HEI can have some misfire problems at high RPMs because the plug contacts are closer and the higher energy spark can some times hit the next contact at the high revs. You probably are not going to be there.

Trees
02-02-2004 07:17 PM
rifraf All the newer fuel delivery/emision stuff vs hei/aftermarket intake. It would cost more to go back to basics on the v6. I was also under the impresion the blocks were a finer material on heavy trucks,they have more nickle,I also thought the suv/light trucks came with 2 or 4 bolt main.

Oh yea,hei wont fit anyway.
02-02-2004 10:04 AM
bluesman123 Again I'm not really doubting you, Rifraf, but I thought all the late model 350s (5.7s) were 4-bolt mains and used the same blocks. I do know that one of the issues with vortec heads from junkyards is that those from heavy trucks were worse flowing and did not have the potential of the light truck heads...seems there was a thread a year or so back where this discussion came up and someone posted casting numbers so you wouldn't make a mistake. You are absolutely right about valves designed for much higher exhaust temps.

By the way...4.3s use the same motor mounts as small blocks...but not the same as the 2.8s. It is not difficult to change the pads so they fit.

Dave
02-02-2004 01:11 AM
musky2
small block 267 into rx7

Why would you say the 267 would be an easier install than a 4.3 Chevy v6?
02-01-2004 10:52 PM
j_labossiere Yup, my thoughts exactly!
Hmmmm...

Jordan
02-01-2004 09:59 PM
rifraf Wow,the small block with goodies,intake and such is probably tougher and simpler for a swap,but the 6 is going to put out about the same power and be lighter.hard call
02-01-2004 08:35 PM
j_labossiere OK, so here's the deal!

I've got a 700-R4 out of a 89 Astro Van. Now, the van has a good running 4.3 V6 in it. Is it worth it to use this as opposed to the 267? Any way to get performance parts? What kind of horsepower numbers? Again, I'm looking for a little fun, but mostly reliability.

Thanks
Jordan
01-31-2004 06:06 PM
rifraf bluesman,here is what your missing,4 bolt main,higher nickel block,guaranteed beefy rods,some with steel cranks,194 or 202 stelite valve hard seat heads and usually the same head chamber as your mid power cars,still sound bad?Sounds like a solid base to me. Usually the cam is the only thing lacking for some good power,which it didn't sound like he needed that much of anyway,so why not have one thats tough,I mean sure if you can find a good zz4 laying around a junkyard for cheap,by all means buy it.
01-31-2004 04:43 PM
j_labossiere The story behind the 267 is pretty stupid. I bought a Blazer that had a "V-8 Conversion" that was done to it. The guy said it was a 350, but it has and Edelbrock Performer intake and some other goodies, so I bought it without really looking at the numbers. When I got it home, I checked the casting number and that ended the hope. Oh well, live and learn! I guess he meant the tranny! (TH-350)

Jordan
01-31-2004 04:29 PM
bluesman123 Why would you want a mouse from a heavy truck? The valves and heads are designed for heavy pulling and high exhaust temps (thick stems, etc). I can't imagine that profile fits an RX-7 retrofit. The same engine out of a light truck or SUV would be much more suitable, in my opinion (and a lot more common).

I'm not trying to pick on you, I'm just wondering what I am missing?? I couldn't agree more about the 267...after all, all the cast-iron small blocks weigh about the same no matter what the displacement.

Dave
01-30-2004 10:38 PM
rifraf For a good run of the mill one,I would look for a low mile good compression heavy truck 350,like 3/4 ton or better.
01-30-2004 10:21 PM
j_labossiere Well now thats a kick in the teeth!

Oh well, shoulda seen it coming.... Free is too good to be true! The motor already has most of a gasket set in it, thats why I wanted to keep on it, but oh well. Any recommendations on a good 350 donor car? Nothing wild, just something good and reliable, and CHEAP! My buddy owns a wrecking yard .

Anyway, thanks as always
Jordan
01-30-2004 10:35 AM
Goldduster360 A stock RX7 will be faster than that boat anchor 267 Chevy. From a performance standpoint that is just about the worst small block you can choose. It has tiny cylinder bores that will not tolerate much cam lift, 1.94 intake valves will not clear the bores either. The small cubic inch displacement won't like much cam duration either.

I had one in a 79 Malibu Wagon and it had over 230,000 miles logged on it before parting with it while still running great. A very weak but long lived small block. The little mouse even towed a 23 foot boat but sometimes depending on how low the tide was we needed to run the boat's motor to help pull the boat and trailer out of the water! This engine got beat on allot but like a volkswagen beetle(the early ones) didn't have enough horsepower to hurt itself.

It got pretty decent mileage too but was definitely a product of emissions/fuel economy thinking back in the dark ages. This combo was not designed to make allot of power.

The 267 has little performance potential but would make a great pump house motor! LOL
01-29-2004 10:57 PM
lluciano77 You will probably get about the same mileage out of a 350. Sell the 267 and use the money towards a 350.
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