Quote:
Originally Posted by mmkkpro
It is a 1990, how can you tell if its been ported? I have tried to contact the original owner without success, so I really know next to nothing about its history other than what the guy I bought it from has told me. Thanks
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DOH! (palm slap to forehead!) Yes, (thanks to Jeff - [he's so kind, ain't he?]
), and yes, I am on post-op meds
I see now it IS Han's motor.
The runners of a stock (non-ported) 1990-92 are ~ 33mm diameter on primaries, and 36mm on secondaries. Once the
Injector Housing (aka "IH") runners have been ported they BOTH will be ~36+mm in diameter, OR even partially or completely "siamesed". Han's runners are obviously - or appear to me anyway - to be uniformed AND appear to have the traces of scoring left by the tooling used to do the porting.
Oh, and why do porting?? Well....HORSEPOWER! The stock LT5, especially the 90-92s were starving for air. Porting alone, coupled with necessary fueling adjustments for the added air volume can buy you an extra 100+ "free" horsepower and bring you to ~ 490 crank hp w/o loosing any of the drivability you'd likely experience if you tried that with any (SBC) pushrod motor.
And with headers, "X-pipe" (and eliminating the resonator), it is common place now to see 510-520+ hp on stock cams, stock idle, ALL the accessories (AC) working as before! Re-ground cams, sleeves, etc.?
Welcome to the BEAST!
Oh, and while we're on it, the DOHC LT5 will wind to 7000 rpm, and as
Dave Mclellan once said regarding revving to the limit:
"it (the LT5) will thank you for it!"
AND, after porting, something our own renown FBI guy and post production LT5 developer, Pete Polatsidis, put me onto is the look on people's faces when you do a 5-2 downshift at ~ 45-50 mph and stand on it to 7000+ rpm!* It will really wipe the smirk off the face of a LOT of wise-azz push-rod junkies!
* 90 mph w/ stock rear end
What's not to like?