L31 Stroker Dyno #'s

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Nov 12, 2003 | 05:31 PM

silverado

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From: Bakersfield

L31 Stroker Dyno #'s

Took my truck to the dyno, and even though its not an LT1 I thought you guys might be interested.

327.4 RWHP
381.1 RWTQ

This is with the stock vortec fuel injection with only 19 lb. injectors. I could squeeze some more out with electric fans, but I'm pretty happy with these numbers considering the intake manifolds poor performance. I hear alot of people talk about putting a stroker in their truck but I have yet to see any dyno #'s from people that have with a similar setup N/A (L31). Plus, its a Hotcam motor so people should bash on it off the bat.

Nov 12, 2003 | 05:36 PM

Vents

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From: Texas, it's like your state, but better.

thats pretty cool for a truck. i'd bet it's a fun silverado

Nov 12, 2003 | 11:05 PM

silverado

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From: Bakersfield

Are these #'s decent for a Hotcam in my combo???

Nov 13, 2003 | 01:21 PM

Pro Stock John

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From: Chicago, IL

I would post this also in the truck forum.

Numbers look good. what was your a/f on the dyno?

Nov 13, 2003 | 05:14 PM

BizZzatch350

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From: T E X A S

Post some pics of the truck!

Nov 14, 2003 | 12:49 AM

silverado

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From: Bakersfield

A/F ratio was 13:1

Nov 14, 2003 | 01:01 PM

Pro Stock John

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From: Chicago, IL

Stock heads or ported heads?

Is the stroker kit for an L31 the same as a SBC? Did you use a cast crank?

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Nov 14, 2003 | 02:20 PM

silverado

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From: Bakersfield

I am using Vortec heads that I ported myself. I am also using an Eagle 4340 forged crank, and 4340 H-beam rods. Its just a late model one piece rear main seal short block: topped off with stock heads and fuel injection . Stock hp is 255 and puts down 190-200 to the wheels, so with those #'s I would be at bout 420 H.P. at the crank. Makes sense to me, Hotrod did a dyno test with GM's 383 crate engine and made 416 H.P. with same cam.
So I'm glad that I'm at least in the same ball park.