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Post by DanD on Jun 5, 2005 8:43:14 GMT -5
I’ve been working on my sons car since Friday afternoon changing out the Pontiac 301cu” for the Chevy small block 357cu”. A lot more things to change over then what I’d remembered form the last time doing one. Between all the fabricating of transmission mount, throttle linkage bracketing and all the small things it’s taking a little bit longer to get done but it coming along. Here are a couple of pictures. New engine  Poor old 301 being put to rest  Just sat in for the first test fit.  The wife begrudgingly donated the sheet for the opperation.  |
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Post by oldtimer5520 on Jun 5, 2005 10:02:11 GMT -5
Hi DanD,
It be lookin good. Brings back memories of about twenty five years ago. Did a lot of engine swaps on Mopars. Found them to be easier to convert. Good luck with the change over.
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Post by Venturi on Jun 6, 2005 2:26:31 GMT -5
Good looking motor Dan, I bet it has a few more ponies than that old 301 too. LoL
Glad to see you drop by now and again Ron, don't be a stranger.
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Post by DanD on Jun 6, 2005 5:46:02 GMT -5
It should push the old Firebird down the road a little quicker.
The block is a high nickel content four bolt-main 350, which originally came out of a 71 pick-up truck. Had it bored out .040” to make it into a 357, with a set of 10.25 to 1 hyperutectic flat top pistons.
A 300/500-camshaft witch may be a little too much duration to build any decent vacuum at idle, but I’m hoping that the 1 gallon vacuum bottle, I made will help with that.
The cylinder heads are the 461 double hump 300 hp that were originally on a 67 327cu” fuel injected Corvette.
Victor Jr single plain intake with a 750 Holly sitting on top.
700R4 transmission that I hope will stay together with what I think the engine will be pushing into it. Last but not least a set of 373’s through a 10-bolt posi differential with a set of 32” tall tires.
Can you say gitty-up and yea I know I’m rambling but I’m starting to get pumped about hearing this thing fire up and go down the road.
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Post by way2old on Jun 6, 2005 7:41:24 GMT -5
Hey Dan. Ever think about painting it to match the wife's sheet?  Really make the boy go off. Looks good. See ya. |
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Post by re-tired on Jun 11, 2005 2:52:57 GMT -5
I built a eng close to same specs .had to use elect. vac pump. lost brake boost if stopped more than 2 min even with can . Gonna use pump gas with dem flat-tops? Nice to see a builder with eye for detail -lost art.
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Post by DanD on Jun 12, 2005 9:39:07 GMT -5
The 10.25 pistons are about as high as a compression ratio that I knew we would get away with and still use pump gas. Sunoco gas bars here still have their ultra and they claim it has a 94octain rating.
So far I haven’t noticed any audible pinging or detonation, even at a 12 degree initial ignition timing and total timing of about 34 degree.
Your explanation of the power brakes is as if you were in the car, you learn not to pump the brake pedal or you run out of vacuum. The vacuum pump is next on the agenda, but I’m mixed on which style belt driven or electric?
They’re both going to rob power and with the two electric cooling fans and the Boys sound system I don’t know if the alternator can handle any more draw. The 63 amp now drags about 50 to 75 rpm out of the engine when the fans kick in, even more with his amp and subs, barking out that noise he calls music.
What do you guys think and I know my answer is to pull the fuse on the stereo but that wont be an option. LOL
Larger alt or belt driven vac pump?
Dan
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Post by re-tired on Jun 12, 2005 11:25:50 GMT -5
My vote is for electric pump. One less belt, and you wont clutter up that nice engine compartment.With a pressure sw it will only be on as needed--like when your power braking that baby. Or do ya have line lock.  |
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Post by DanD on Jun 12, 2005 12:45:58 GMT -5
Yea it has line lock, I was tiered of the kid burning off the brakes as well as the tires.
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