how do you tell car block from truck? - Team Camaro Tech
Engine General Engine Discussion.

 
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post #1 of 2 (permalink) Old Mar 28th, 04, 05:26 AM Thread Starter
 
Join Date: Mar 2004
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I have been looking at some used engines , big blocks, need to know what to look for and what are the cons against truck blocks??
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post #2 of 2 (permalink) Old Mar 28th, 04, 06:22 AM
 
Join Date: Apr 2000
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The heavi-Duty 366 and 427 truck blocks are .400" taller at the decks. You can tell them by checking the pass. side upper water pump bolt hole b/c it is about 3/8" down from the deck on the standard 9.8" tall motors and about 3/4" below the deck on the 10.2" tall deck motors.

AND there are NO tall deck 454 motors!!!

What generally happens is that you run into header fitment problems due to the taller decked blocks raising and thus moving the heads exhaust ports farther apart on the motor's "V".

And then you have to find performance intakes for the wider "V'ed" motors or else use spacers. And the distributors are taller or longer unless the performance intake you find to use can use the standard car length distributors..

If you want to hassle with a tall decked block, they are generally thick cylindered so can usually be bored an 1/8th over and then due to the taller deck, you can run stroker cranks and keep good rod/stroke ratio's!!

I think the 427 blocks can go up to over 550" with the 1/8" overbore and a stroked crank if you want to do some serious crank/main/rod webbing area grinding to allow for the needed block clearancing!!

I personally would stop at a 4.375" bore x 4.375" stroked crank for about a 526" motor b/c I figure it should almost drop right in!!!!

pdq67



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