[Carolina71]

Hello i have a big block 454 i pulled out of a GMC flatbed. Im deciding on whether or not to put it in my 71 chevelle so i want to figure out the horsepower and all the information i can. The engine casting number is 14015445. The number over the timing chain cover is 10602TRF. Any info you can give me is appreciated. Thanks.

 

[LS7]

14015445 ~ 454 78-90 2 or 4 bolt.

T0602 ~ Assembled at the Tonawanda engine assembly plant June 2nd.

TRF ~ Truck 1978 454 250HP Turbo 400 transmission RPO LF-8

TRF ~ Truck 1980 454 210HP Turbo 400 transmission RPO LE-8

 

[Carolina71]

thanks

 

[Carolina71]

So the motor only has 250hp thats not as much as i had hoped but oh well.

 

[LS7]

So the motor only has 250hp thats not as much as i had hoped but oh well.

In stock form. FWIW, don't under estimate the torque factor of these 70's low horse 454's. :thumbsup:

 

[Carolina71]

ok thanks

 

[Carolina71]

Could you give me an estimate of the MPG if you can. The motor is completely stock

 

[kettbo]

Preston,

Welcome to Team Chevelle.
One trade-off for a big engine, a big powerful engine in modified form is rather poor MPG.
How poor depends on many factors, including the driver's right foot pressure on the gas pedal.
BBCs here get from 18 (or there about with OD transmissions) down to 8 (or less) MPG.
Stock 10-12 MPG is a fair guess.
The mid 70s 454s had low compression and very mild cams. Some more compression, decent cam, game on.
My lightly modified 454 now has 8.8:1 CR and may possibly run a 12.9 something/103 mph this coming FRIDAY.

 

[Guest]

Add a set of early -206 heads and .020" thick shims to get her up to like 9.2 to 1 CR'd, then install a 270 cam and a cheap set of 1.75" dia., 4-tube, long headers and go!

Sucker will wake right up, imho.

pdq67

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[kettbo]

As PDQ said, #206 heads (last three casting numbers on the head) have small chambers. That and a shim gasket really boost the low compression ratio...then add a moderate performance cam. Huge gain in power.
Other heads to look for are #702 and #390.
I have 063 heads....chambers are a bit biger so my CR with a regular gasket is 8.8:1.

 

[Carolina71]

Thanks for the info guys im debating on if im better to keep the 350 i have in it or put the 454 in it. I know ill see a major difference if MPG im leaning towards just leaving the 350 in.