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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Hotrodding Basics> Project: 1965 Corvair Kelmark V8 - What motor / recipe?
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Topic Review (Newest First)
01-20-2013 12:23 PM
mikebuongiorno
LM4 / LM7 Gen 3 snag

Hit a (major?) bump.

The gen 3 requires as far as I am reading a 14 1/8" 168 tooth flywheel.

My kelmark special adapter for SBC to corvair diff is 14." Plus the gen 3 pushes the flywheel into the bellhousing / adapater 0.4" deeper. Looks like I need to scrap the gen 3 plan, or mill out my adapter (if even possible) or cast / fab a new adapater (not gonna happen).

Anyone know of a work around I might not yet have read about?

most of my info is from this very nice car craft article on using gen 3 and classic trans (my config is the corvair diff and saginaw 4 speed).

Engine and Transmission Swap Gen III - Car Craft Magazine


-mike
01-17-2013 01:22 AM
techinspector1
Quote:
Originally Posted by mikebuongiorno View Post
The LM4.

LM4 applications:
20032004 Chevrolet TrailBlazer EXT
20032004 Isuzu Ascender
2004 GMC Envoy XL
20032004 Chevrolet SSR
2004 Buick Rainier
Let the search begin....
01-17-2013 12:52 AM
mikebuongiorno The LM4.

LM4 applications:
20032004 Chevrolet TrailBlazer EXT
20032004 Isuzu Ascender
2004 GMC Envoy XL
20032004 Chevrolet SSR
2004 Buick Rainier
01-17-2013 12:51 AM
techinspector1
Quote:
Originally Posted by mikebuongiorno View Post
probably buy the car and sell the rest right?
Right, but don't sell anything off the donor until your project is finished and running down the road. Ask me how I know.
I'd start with the local little newspapers from the grocery store. If you know all the cars/trucks that had that motor in them ahead of time, you could scan those papers first. I used to drive around and look behind fences/barns/abandoned buildings and sometimes I'd find one sitting at the edge of the road or the curb in residential areas. I wouldn't go to a boneyard except if there is no other way. Check the local auctions such as police auctions. Look on craigslist. I used to check the section "Projects" in Ebay Motors.
01-17-2013 12:41 AM
mikebuongiorno probably buy the car and sell the rest right?
01-17-2013 12:41 AM
mikebuongiorno dang. I think thats just the ticket.

You guys are the best, will keep you posted.

From a sourcing perspective, is this something you think is readily available at a local yard, or where would you look I guess is a better way to ask?

Thanks!
01-16-2013 11:23 PM
techinspector1 4.8L All alloy
295 BHP @5600rpm
305 ft/lbs @4800rm
Looks very much like the missing piece of the puzzle. Thanks 1Gary.
I think I'd try to find a donor and use everything out of it, wiring, computer and all.
01-16-2013 11:10 PM
mikebuongiorno 4.8 gen III sounds like might be my engine. will do some more research.
01-16-2013 10:41 PM
techinspector1
Quote:
Originally Posted by 1Gary View Post
A 4.8 Gen III is a all aluminum engine.Light,late torque curve,good hp ratings.

I remember a guy who used a Tornado trans axle with a high hp 350.
Bill Porterfield, Mid-Engineering
01-16-2013 10:34 PM
1Gary A 4.8 Gen III is a all aluminum engine.Light,late torque curve,good hp ratings.

I remember a guy who used a Tornado trans axle with a high hp 350.
01-16-2013 10:20 PM
mikebuongiorno
kelmark

The kelmark config (mine) goes block, diff, tranny. Plenty of legroom over the crown (about a foot more I think) A quill shaft/input shaft is weak link though, and the ring gear spins in reverse.

http://t0.gstatic.com/images?q=tbn:A...iM9EFzh_hEDgXw

http://t0.gstatic.com/images?q=tbn:A...nrn9ewVIIWSAMh

What are some of the hot rod tricks I can employ for dealing with the torque shock on that shaft ? Does a 11-12" clutch with heavy duty springs help? Does a heavy flywheel / balancer combo help?

Found a guy with a zz4 crate, practically new, roller cam, aluminium heads, for $800. Thinking cam that thing and exercise restraint !

So many options, so to summarize whats on the table:

-zz4 crate for $800 with 500 autocross racing miles on it (feels like a good deal)
-new 350/290 from jegs $1900 (i like this too, mostly for the price)
-Craigslist 283 or 327 (feels like the right CID to save the driveline)
-Gen III smaller displacement crate (have no experience with this)
-aluminium 215 rover (would be an awesome option, keeping the car light has tons of benefit)

My ultimate goal is light mid engine sports car for windy roads that will wind up to 6000-6500, 300HP/300TQ < $5k complete is the goal. With the budget I think the 215 and the gen 3 with computer will be tough, a new or pr

The
01-16-2013 05:35 PM
poncho62 The Kelmark kit had more room than the Crown setup.......One you has to turn the transaxle around, the other you didnt....dont remember which was which
01-16-2013 05:15 PM
techinspector1
Quote:
Originally Posted by poncho62 View Post
I'm thinking that a 4.3 would work nice....Chevy bolt pattern, lots of perf parts available....the shorter length would work nice behind the seat
Good point Poncho, I do seem to remember that the seating arrangement needed some surgery. And I absolutely love the sound of a 6-banger with separate exhausts.
01-16-2013 05:12 PM
poncho62 I'm thinking that a 4.3 would work nice....Chevy bolt pattern, lots of perf parts available....the shorter length would work nice behind the seat
01-16-2013 04:16 PM
vinniekq2 215 rover with a cam sounds tough,thats about all
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