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Old 01-26-2011, 06:13 PM
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Pace Performance Engine

Looked in archives, not too much about this. I am looking at a PACE-10067353-4 Pace Pac 350cid 300HP Crate Engine (No Intake).
I read that the GMPP 350/290 hp crate engine has poor heads and is low on compression. Can anyone give me the scoop on how this engine (Pace) runs.
I'm just looking for a dependable engine with a bit of kick.
Any info is appreciated,
Larry

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Old 01-27-2011, 12:06 PM
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Quote:
Originally Posted by lwin517
Looked in archives, not too much about this. I am looking at a PACE-10067353-4 Pace Pac 350cid 300HP Crate Engine (No Intake).
I read that the GMPP 350/290 hp crate engine has poor heads and is low on compression. Can anyone give me the scoop on how this engine (Pace) runs.
I'm just looking for a dependable engine with a bit of kick.
Any info is appreciated,
Larry
The stuff Pace quotes for this GM part number 10067353 is not what the GM configuration paper for this engine states. This is the basic Targetmaster/Goodwrench 2 piece rear seal replacement 350 rated at around 230-250 hp depending I guess on whose writing the advertising.

Anyway, this is a decently priced motor but not very efficiently configured. Chevy High Performance magazine used one of these some years ago as a dyno test mule, they went through an intake, carb, exhaust, and cam change from the original while testing the original head and as ported, the old L98 ?vette head, the Vortec, and several aftermarket heads. In the end on the original bottom end with a Comp XEH272 cam, Holley 750, Performer RPM intake and some long tube headers they pulled over 400 horses out of it.

Bogie
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Old 01-30-2011, 11:57 AM
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Let me first say I have no personal experience with the Pace Pac 350/300, but the 350/300HP version is, in my opinion, more desirable, and is the engine GMPP should have come out with instead of the 350/290. The 350ci 300HP crate engine uses the same long block used in the "Universal 350" and the 350/290HP engines. The camshaft (.443 intake/.465 exhaust, 214* intake/224* exhaust, 112 LCA) is basically a copy of the cam used in the GMPP 350HO/330HP and 350/350HP circle track crate engines (.435 intake/.460 exhaust, 212* intake/222* exhaust, 112 LCA). It has a few thousandths more lift and 2* more intake/exhaust duration with the same 112* lobe center spacing. The 350/290 uses a 40 year old technology camshaft that was designed for an engine with 11:1 CR. The Pace Pac 350/300 uses a modern split pattern cam designed to be used in lower compression engines, and will have better low end and street manners. The Pace Pac 300 cam will give some of that "rump rump" that we all like, but still have great bottom end. A great feature is Pace prices their 350/300 version for $160 LESS than the 350/290!

From Lunati.com here's the description of the Lunati version of the cam: Advertised Duration (Intake/Exhaust) 280/290 Duration @.050" (Intake/Exhaust) 214/224 Gross Valve Lift (Intake/Exhaust) .443"/.465" Lobe Seperation 112 Intake Center Line 107 RPM Range 1500-5500 Part Number: 10001LK $99.95 at Summit

To get an idea of what the cam will sound like, here's a video clip of a 350HO start up: http://www.youtube.com/watch?v=ScHhUQtEiU0

EVERY cam grinder has a cam with those specs, or nearly identical specs, so that should say something about the popularity/usefulness of these cams in the engines lots of guys are running today.

Like oldbogie pointed out, any of these versions can be used for a build up that can make pretty serious power. I would say if you're going to use the engine as is, this would make a great street engine. If you're going to use it for a build up, then just buy the "Universal 350" version for $1500, no use to pay more for parts that you're gonna pull off.

Ed
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