ok im thinking about swapping my 79 rx7 to either a 350 chevy v8 or a 305 chevy. im sure someone on this forum has done it and i just need to know if i need special motor mounts, driveline, rear axle, stuff like that. and i need to know if i have to make any major modifications to the frame

 

http://www.grannysspeedshop.com/

 

You need to go to confession, and atone for your sin...

 

if you have to go with a first gen iron block chevy, stay away from a 305. And if you have to do an iron block try to do aluminum heads to keep some weight down

 

haha i know i will

 

ok how hard would it be to make my own motor mounts? id rather not spend 600 on a kit

 

there is a way just find a s10 with a v6 and take that motor mount because s10s are easy to throw in a 350 all you need to do is turn the motor mount around and they bolt right in. but keep the rotary because piston motors belong in piston cars

 

yeah i was thinkin about it and i wanna stay with the rotary because i like high rpm's

 

Good, lol. I'd hate to see a 79 succumb to a V8 conversion, get a more common FB if you're gonna do that.

 

dude trust me the weight of that conversion and what you'll spend to do it right isnt worth it. take that 12a in it street port it with a holly carb and 75 hp shot of nos ,you'll have fun kill most street v8s and save yourself about a grand

 

A streetport 12a would embarrass a stock iron 305, those things are dogs.

 

Horsepower to weight ratio my friend. V8 iron block? Is like having a fat chick riding passenger on a scooter.

 

hahaha ok i guess ill stay with the 12a but i need to get the carb rebuilt =(

 

all you need to know can be found here.

FB swaps are not too common, but there are several completed swaps on the link above.

 

Wow, I'm amazed at how many people try to dissuade someone from doing a swap in the "other engines" section of the boards. Even some that provide help say not to do it, so much for an open mind.

 

Just find a good 350 and you won't regret it. Even if it is Iron block/head its still worth it unless you're planning on doing mostly autox. If it's just going to be on the street or drag strip you'll never notice the added weight. I have a 1980 rx7 with an iron headed 350 and it's great.

Just don't put too much faith in other people opinions, especially when they have no experience in what your trying to do.

 

do you by chance have any pics of ur rx7?

 

Wish this was mine but I have an FC..... It had a 305. It lasted 12000 miles in the 7, was not rebuilt after it was pulled out of donor car with 165k miles. I NEEDED 15 psi boost to kill this stock CAST piston, cast crank, "305 OMGWTFBBQ worst engine ever". when i say needed, I ran 10psi for a week flogging the crap out of it all the time. About 900 mi.
The only two swaps i dislike are in SA's or CYM 3rd gens. The swaps are a lot of fun but are one of the things, if you need to ask if you need a kit.... you do. some one with good fab skills will not ask if they need it they will jump in ***** deep to do it.

 

ive been thinking of the v8 swap lately but now im thinking of going back to the 20b conversion, i cant put a v8 in my rx7. rotaries are the ****, i dont know what i was thinking.