I'm in the running for a new motor, and my budget is'nt huge but I'm planning on going with the 350 "Base" Goodwrench Engine Crate from Jegs. I'm going to be running the TPI on it with a Dualk Exhaust, and am wondering how much have people paid on Labor costs for the upgrade from a 305 to 350? Also would I be looking at 340-350 horse with the TPI intake on it?, My tranny has already been worked, so that's not a problem.

 

I think if you are looking for a crate motor than I would check out www.gmpartsdirect.com cause there prices are pretty good. The motor I'm getting, ZZ4 shortblock, is $113.49 cheaper. PLus $179 shipping compared to $99. I dont know what jegs sells them for but I have also been looking and found the prices there to be pretty good. Just thought I would let you know...Maybe you already did?

But try and save all you can.

 

You will pay about $1200 est for labor and another $1500 for additional base parts. And NO, you will see nothing like the numbers you mentioned for Horsepower with the base goodwrench 350. Some of the reasons are the weak Cam and poor Heads to start with. My quess with your TPI would be about 215 HP and
320 TQ at the flywheel.

 

The 350 base Goodwrench is not a high performance motor.

You will get less than stock horsepower with a TPI induction
on this motor. Lower compression, smaller cam, and low perf heads are the main roadblocks.

If you still have your 305 TPI heads (#081) you have a good base for a 350 TPI rebuild/ buildup.
Take your core to a qualified engine rebuilder and have them
build you a 350 flat top piston motor with the right camshaft.
Then fully port your 305 TPI heads and upgrade to 1.94x160" valves. And have them rebuilt. (guides, springs, valvejob etc)

This combined with some headers and TPI manifold porting will get you to your 350 HP goal.

Better than new.

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will the 305 heads work on a 350?? I thought they would not work.

 

the smaller cc makes for a higher CR right? am i wrong in saying that the cc volume affects CR?

 

YES! Smaller cc Heads will effect the compression ratio.

 

YOU CAN"T DO THAT!!!!

Ya , you can. Once you've ported and upgraded to larger valves, you'll have a good budget-performance hi-perf head
that out performes stock 350 heads.

The final chamber cc size will be about 61/62 cc's after chamber unshrouding.

For this type of build up the 305 TPI heads are a very good base to start with.

 

Jegs doesn't sell the Goodwrench low-po engines. I assume since you mentioned "base" you are referring to the 330hp HO 350 GM Performance Parts crate engine that Jegs sells with "base" in the name...

You would have to get the Scoggin Dickey TPI intake for Vortec heads in that case (around $400). They sell the 350 HO basic crate engine for like $20 cheaper there (www.sdpc2000.com), and you can get the intake from them. Not a bad choice if a crate engine if what you're looking for.

The TPI is not going to add power to the engine's rating though, in fact you'll be lucky if you don't lose too much, since TPI is pretty restrictive. The Vortec TPI base helps, but you still need to upgrade the runners...