Bill K... 427 tall deck? - Team Camaro Tech
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post #1 of 4 (permalink) Old Nov 26th, 99, 07:56 PM Thread Starter
 
Join Date: Jun 1999
Posts: 475
I found a 427 I can pick up for a pretty good price. The only thing is its a newer 427 out of about a 3-5 ton industrial truck. My question is what diferances will this have verse the older short deck blocks in overall engine performance.
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post #2 of 4 (permalink) Old Nov 27th, 99, 06:41 PM
 
Join Date: Jun 1999
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The "truck" blocks have a taller deck than the automotive blocks, 10.2" and 9.8" respectively. The advantage to running the taller deck is that you can get a longer rod which reduces piston side wall loading, increases time piston is at TDC and slows down the piston speed. The disadvantage is I think, I have yet to try this setup, is that the tall deck block may put the heads right where the brake power booster is located. No power brakes. If you decide to go with the tall deck check for casting shift. I understand the truck blocks are prone to core shift resulting in thin cylinder walls.
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post #3 of 4 (permalink) Old Nov 28th, 99, 02:43 PM
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Bill
 
Join Date: Aug 1998
Location: Waldorf Md. USA
Posts: 3,283
Austin,
Joseph about summed it all up. But, if you can get the thing for a real cheap price, like a hundred bucks or so, it would be worth it for the crank and rods. Most of the truck motors had steel cranks in them. You did not say what year it was, but the newer motors have a one piece rear main seal crankshaft that will not go into an older style block. Personally, for a street motor, the slight advantage of being able to use a longer rod just is not worth the hassles which include clearence problems, intake manifold spacers, different (taller) distributor etc.

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Bill Koustenis
Advanced Automotive Machine
Waldorf Md


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post #4 of 4 (permalink) Old Nov 28th, 99, 07:31 PM Thread Starter
 
Join Date: Jun 1999
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Thanks for the response. The price is $400. it's a complete long block less intake, not sure of the year "newer" he has two one was fuel injected and has the one piece seal the other is two piece seal. Right now I have a 302 and love it, but its set up fairly "rad" with 12.5 pistons and a solid cam that loves to rev up to 8500, well you see what I mean. Its not like I drive the car everyday but the power you can get out of a mild 427 is impressive, but from what you said sounds like I should keep looking. By the way even if I get a big block the 302 will stay in my garage!
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